Well-known ports (0 to 1023)

660 system ports with a registered service, from the IANA registry fetched on 14 November 2026.

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Port	Protocols	Service name	IANA description
1	tcp, udp	tcpmux	TCP Port Service Multiplexer
5	tcp, udp	rje	Remote Job Entry
7	tcp, udp	echo	Echo
9	dccp, sctp, tcp, udp	discard	Discard
11	tcp, udp	systat	Active Users
13	tcp, udp	daytime	Daytime
17	tcp, udp	qotd	Quote of the Day
18	tcp, udp	msp	Message Send Protocol (historic)
19	tcp, udp	chargen	Character Generator
20	sctp, tcp, udp	ftp-data	File Transfer [Default Data]
21	sctp, tcp, udp	ftp	File Transfer Protocol [Control]
22	sctp, tcp, udp	ssh	The Secure Shell (SSH) Protocol
23	tcp, udp	telnet	Telnet
25	tcp, udp	smtp	Simple Mail Transfer
27	tcp, udp	nsw-fe	NSW User System FE
29	tcp, udp	msg-icp	MSG ICP
31	tcp, udp	msg-auth	MSG Authentication
33	tcp, udp	dsp	Display Support Protocol
37	tcp, udp	time	Time
38	tcp, udp	rap	Route Access Protocol
39	tcp, udp	rlp	Resource Location Protocol
41	tcp, udp	graphics	Graphics
42	tcp, udp	name (+1 more)	Host Name Server
43	tcp, udp	nicname	Who Is
44	tcp, udp	mpm-flags	MPM FLAGS Protocol
45	tcp, udp	mpm	Message Processing Module [recv]
46	tcp, udp	mpm-snd	MPM [default send]
48	tcp, udp	auditd	Digital Audit Daemon
49	tcp, udp	tacacs	Login Host Protocol (TACACS)
50	tcp, udp	re-mail-ck	Remote Mail Checking Protocol
52	tcp, udp	xns-time	XNS Time Protocol
53	tcp, udp	domain	Domain Name Server
54	tcp, udp	xns-ch	XNS Clearinghouse
55	tcp, udp	isi-gl	ISI Graphics Language
56	tcp, udp	xns-auth	XNS Authentication
58	tcp, udp	xns-mail	XNS Mail
62	tcp, udp	acas	ACA Services
63	tcp, udp	whoispp (+1 more)	whois++ IANA assigned this well-formed service name as a replacement for "whois++".
64	tcp, udp	covia	Communications Integrator (CI)
65	tcp, udp	tacacs-ds	TACACS-Database Service
66	tcp, udp	sql-net (+1 more)	Oracle SQLNET IANA assigned this well-formed service name as a replacement for "sqlnet".
67	tcp, udp	bootps	Bootstrap Protocol Server
68	tcp, udp	bootpc	Bootstrap Protocol Client
69	tcp, udp	tftp	Trivial File Transfer
70	tcp, udp	gopher	Gopher
71	tcp, udp	netrjs-1	Remote Job Service
72	tcp, udp	netrjs-2	Remote Job Service
73	tcp, udp	netrjs-3	Remote Job Service
74	tcp, udp	netrjs-4	Remote Job Service
76	tcp, udp	deos	Distributed External Object Store
78	tcp, udp	vettcp	vettcp
79	tcp, udp	finger	Finger
80	sctp, tcp, udp	http (+2 more)	World Wide Web HTTP
82	tcp, udp	xfer	XFER Utility
83	tcp, udp	mit-ml-dev	MIT ML Device
84	tcp, udp	ctf	Common Trace Facility
85	tcp, udp	mit-ml-dev	MIT ML Device
86	tcp, udp	mfcobol	Micro Focus Cobol
88	tcp, udp	kerberos	Kerberos
89	tcp, udp	su-mit-tg	SU/MIT Telnet Gateway
90	tcp, udp	dnsix	DNSIX Securit Attribute Token Map
91	tcp, udp	mit-dov	MIT Dover Spooler
92	tcp, udp	npp	Network Printing Protocol
93	tcp, udp	dcp	Device Control Protocol
94	tcp, udp	objcall	Tivoli Object Dispatcher
95	tcp, udp	supdup	SUPDUP
96	tcp, udp	dixie	DIXIE Protocol Specification
97	tcp, udp	swift-rvf	Swift Remote Virtural File Protocol
98	tcp, udp	tacnews	TAC News
99	tcp, udp	metagram	Metagram Relay
101	tcp, udp	hostname	NIC Host Name Server
102	tcp, udp	iso-tsap	ISO-TSAP Class 0
103	tcp, udp	gppitnp	Genesis Point-to-Point Trans Net
104	tcp, udp	acr-nema	ACR-NEMA Digital Imag. & Comm. 300
105	tcp, udp	cso (+1 more)	CCSO name server protocol
106	tcp, udp	3com-tsmux	3COM-TSMUX
107	tcp, udp	rtelnet	Remote Telnet Service
108	tcp, udp	snagas	SNA Gateway Access Server
109	tcp, udp	pop2	Post Office Protocol - Version 2
110	tcp, udp	pop3	Post Office Protocol - Version 3
111	tcp, udp	sunrpc	SUN Remote Procedure Call
112	tcp, udp	mcidas	McIDAS Data Transmission Protocol
113	tcp, udp	auth	Authentication Service
115	tcp, udp	sftp	Simple File Transfer Protocol
116	tcp, udp	ansanotify	ANSA REX Notify
117	tcp, udp	uucp-path	UUCP Path Service
118	tcp, udp	sqlserv	SQL Services
119	tcp, udp	nntp	Network News Transfer Protocol
120	tcp, udp	cfdptkt	CFDPTKT
121	tcp, udp	erpc	Encore Expedited Remote Pro.Call
122	tcp, udp	smakynet	SMAKYNET
123	tcp, udp	ntp	Network Time Protocol
124	tcp, udp	ansatrader	ANSA REX Trader
125	tcp, udp	locus-map	Locus PC-Interface Net Map Ser
126	tcp, udp	nxedit	NXEdit
127	tcp, udp	locus-con	Locus PC-Interface Conn Server
128	tcp, udp	gss-xlicen	GSS X License Verification
129	tcp, udp	pwdgen	Password Generator Protocol
130	tcp, udp	cisco-fna	cisco FNATIVE
131	tcp, udp	cisco-tna	cisco TNATIVE
132	tcp, udp	cisco-sys	cisco SYSMAINT
133	tcp, udp	statsrv	Statistics Service
134	tcp, udp	ingres-net	INGRES-NET Service
135	tcp, udp	epmap	DCE endpoint resolution
136	tcp, udp	profile	PROFILE Naming System
137	tcp, udp	netbios-ns	NETBIOS Name Service
138	tcp, udp	netbios-dgm	NETBIOS Datagram Service
139	tcp, udp	netbios-ssn	NETBIOS Session Service
140	tcp, udp	emfis-data	EMFIS Data Service
141	tcp, udp	emfis-cntl	EMFIS Control Service
142	tcp, udp	bl-idm	Britton-Lee IDM
143	tcp	imap	Internet Message Access Protocol
144	tcp, udp	uma	Universal Management Architecture
145	tcp, udp	uaac	UAAC Protocol
146	tcp, udp	iso-tp0	ISO-IP0
147	tcp, udp	iso-ip	ISO-IP
148	tcp, udp	jargon	Jargon
149	tcp, udp	aed-512	AED 512 Emulation Service
150	tcp, udp	sql-net	SQL-NET
151	tcp, udp	hems	HEMS
152	tcp, udp	bftp	Background File Transfer Program
153	tcp, udp	sgmp	SGMP
154	tcp, udp	netsc-prod	NETSC
155	tcp, udp	netsc-dev	NETSC
156	tcp, udp	sqlsrv	SQL Service
157	tcp, udp	knet-cmp	KNET/VM Command/Message Protocol
158	tcp, udp	pcmail-srv	PCMail Server
159	tcp, udp	nss-routing	NSS-Routing
160	tcp, udp	sgmp-traps	SGMP-TRAPS
161	tcp, udp	snmp	SNMP
162	tcp, udp	snmptrap	SNMPTRAP
163	tcp, udp	cmip-man	CMIP/TCP Manager
164	tcp, udp	cmip-agent	CMIP/TCP Agent
165	tcp, udp	xns-courier	Xerox
166	tcp, udp	s-net	Sirius Systems
167	tcp, udp	namp	NAMP
168	tcp, udp	rsvd	RSVD
169	tcp, udp	send	SEND
170	tcp, udp	print-srv	Network PostScript
171	tcp, udp	multiplex	Network Innovations Multiplex
172	tcp, udp	cl-1 (+1 more)	Network Innovations CL/1 IANA assigned this well-formed service name as a replacement for "cl/1".
173	tcp, udp	xyplex-mux	Xyplex
174	tcp, udp	mailq	MAILQ
175	tcp, udp	vmnet	VMNET
176	tcp, udp	genrad-mux	GENRAD-MUX
177	tcp, udp	xdmcp	X Display Manager Control Protocol
178	tcp, udp	nextstep	NextStep Window Server
179	sctp, tcp, udp	bgp	Border Gateway Protocol
180	tcp, udp	ris	Intergraph
181	tcp, udp	unify	Unify
182	tcp, udp	audit	Unisys Audit SITP
183	tcp, udp	ocbinder	OCBinder
184	tcp, udp	ocserver	OCServer
185	tcp, udp	remote-kis	Remote-KIS
186	tcp, udp	kis	KIS Protocol
187	tcp, udp	aci	Application Communication Interface
188	tcp, udp	mumps	Plus Five's MUMPS
189	tcp, udp	qft	Queued File Transport
190	tcp, udp	gacp	Gateway Access Control Protocol
191	tcp, udp	prospero	Prospero Directory Service
192	tcp, udp	osu-nms	OSU Network Monitoring System
193	tcp, udp	srmp	Spider Remote Monitoring Protocol
194	tcp, udp	irc	Internet Relay Chat Protocol
195	tcp, udp	dn6-nlm-aud	DNSIX Network Level Module Audit
196	tcp, udp	dn6-smm-red	DNSIX Session Mgt Module Audit Redir
197	tcp, udp	dls	Directory Location Service
198	tcp, udp	dls-mon	Directory Location Service Monitor
199	tcp, udp	smux	SMUX
200	tcp, udp	src	IBM System Resource Controller
201	tcp, udp	at-rtmp	AppleTalk Routing Maintenance
202	tcp, udp	at-nbp	AppleTalk Name Binding
203	tcp, udp	at-3	AppleTalk Unused
204	tcp, udp	at-echo	AppleTalk Echo
205	tcp, udp	at-5	AppleTalk Unused
206	tcp, udp	at-zis	AppleTalk Zone Information
207	tcp, udp	at-7	AppleTalk Unused
208	tcp, udp	at-8	AppleTalk Unused
209	tcp, udp	qmtp	The Quick Mail Transfer Protocol
210	tcp, udp	z39-50 (+1 more)	ANSI Z39.50 IANA assigned this well-formed service name as a replacement for "z39.50".
211	tcp, udp	914c-g (+1 more)	Texas Instruments 914C/G Terminal IANA assigned this well-formed service name as a replacement for "914c/g".
212	tcp, udp	anet	ATEXSSTR
213	tcp, udp	ipx	IPX
214	tcp, udp	vmpwscs	VM PWSCS
215	tcp, udp	softpc	Insignia Solutions
216	tcp, udp	CAIlic	Computer Associates Int'l License Server
217	tcp, udp	dbase	dBASE Unix
218	tcp, udp	mpp	Netix Message Posting Protocol
219	tcp, udp	uarps	Unisys ARPs
220	tcp, udp	imap3	Interactive Mail Access Protocol v3
221	tcp, udp	fln-spx	Berkeley rlogind with SPX auth
222	tcp, udp	rsh-spx	Berkeley rshd with SPX auth
223	tcp, udp	cdc	Certificate Distribution Center
224	tcp, udp	masqdialer	masqdialer
242	tcp, udp	direct	Direct
243	tcp, udp	sur-meas	Survey Measurement
244	tcp, udp	inbusiness	inbusiness
245	tcp, udp	link	LINK
246	tcp, udp	dsp3270	Display Systems Protocol
247	tcp, udp	subntbcst-tftp (+1 more)	SUBNTBCST_TFTP IANA assigned this well-formed service name as a replacement for "subntbcst_tftp".
248	tcp, udp	bhfhs	bhfhs
256	tcp, udp	rap	RAP
257	tcp, udp	set	Secure Electronic Transaction
259	tcp, udp	esro-gen	Efficient Short Remote Operations
260	tcp, udp	openport	Openport
261	tcp, udp	nsiiops	IIOP Name Service over TLS/SSL
262	tcp, udp	arcisdms	Arcisdms
263	tcp, udp	hdap	HDAP
264	tcp, udp	bgmp	BGMP
265	tcp, udp	x-bone-ctl	X-Bone CTL
266	tcp, udp	sst	SCSI on ST
267	tcp, udp	td-service	Tobit David Service Layer
268	tcp, udp	td-replica	Tobit David Replica
269	tcp, udp	manet	MANET Protocols
270	udp	gist	Q-mode encapsulation for GIST messages
271	tcp	pt-tls	IETF Network Endpoint Assessment (NEA) Posture Transport Protocol over TLS (PT-TLS)
280	tcp, udp	http-mgmt	http-mgmt
281	tcp, udp	personal-link	Personal Link
282	tcp, udp	cableport-ax	Cable Port A/X
283	tcp, udp	rescap	rescap
284	tcp, udp	corerjd	corerjd
286	tcp, udp	fxp	FXP Communication
287	tcp, udp	k-block	K-BLOCK
300	tcp	tacacss	TLS Secure Login Host Protocol (TACACSS)
308	tcp, udp	novastorbakcup	Novastor Backup
309	tcp, udp	entrusttime	EntrustTime
310	tcp, udp	bhmds	bhmds
311	tcp, udp	asip-webadmin	AppleShare IP WebAdmin
312	tcp, udp	vslmp	VSLMP
313	tcp, udp	magenta-logic	Magenta Logic
314	tcp, udp	opalis-robot	Opalis Robot
315	tcp, udp	dpsi	DPSI
316	tcp, udp	decauth	decAuth
317	tcp, udp	zannet	Zannet
318	tcp, udp	pkix-timestamp	PKIX TimeStamp
319	tcp, udp	ptp-event	PTP Event
320	tcp, udp	ptp-general	PTP General
321	tcp, udp	pip	PIP
322	tcp, udp	rtsps	RTSPS
323	tcp	rpki-rtr	Resource PKI to Router Protocol
324	tcp	rpki-rtr-tls	Resource PKI to Router Protocol over TLS
333	tcp, udp	texar	Texar Security Port
344	tcp, udp	pdap	Prospero Data Access Protocol
345	tcp, udp	pawserv	Perf Analysis Workbench
346	tcp, udp	zserv	Zebra server
347	tcp, udp	fatserv	Fatmen Server
348	tcp, udp	csi-sgwp	Cabletron Management Protocol
349	tcp, udp	mftp	mftp
350	tcp, udp	matip-type-a	MATIP Type A
351	tcp, udp	matip-type-b (+1 more)	MATIP Type B
352	tcp, udp	dtag-ste-sb (+1 more)	DTAG
353	tcp, udp	ndsauth	NDSAUTH
354	tcp, udp	bh611	bh611
355	tcp, udp	datex-asn	DATEX-ASN
356	tcp, udp	cloanto-net-1	Cloanto Net 1
357	tcp, udp	bhevent	bhevent
358	tcp, udp	shrinkwrap	Shrinkwrap
360	tcp, udp	scoi2odialog	scoi2odialog
361	tcp, udp	semantix	Semantix
362	tcp, udp	srssend	SRS Send
363	tcp, udp	rsvp-tunnel (+1 more)	RSVP Tunnel IANA assigned this well-formed service name as a replacement for "rsvp_tunnel".
364	tcp, udp	aurora-cmgr	Aurora CMGR
365	tcp, udp	dtk	DTK
366	tcp, udp	odmr	ODMR
367	tcp, udp	mortgageware	MortgageWare
368	tcp, udp	qbikgdp	QbikGDP
369	tcp, udp	rpc2portmap	rpc2portmap
370	tcp, udp	codaauth2	codaauth2
371	tcp, udp	clearcase	Clearcase
372	tcp, udp	ulistproc	ListProcessor
373	tcp, udp	legent-1	Legent Corporation
374	tcp, udp	legent-2	Legent Corporation
375	tcp, udp	hassle	Hassle
376	tcp, udp	nip	Amiga Envoy Network Inquiry Protocol
377	tcp, udp	tnETOS	NEC Corporation
378	tcp, udp	dsETOS	NEC Corporation
379	tcp, udp	is99c	TIA/EIA/IS-99 modem client
380	tcp, udp	is99s	TIA/EIA/IS-99 modem server
381	tcp, udp	hp-collector	hp performance data collector
382	tcp, udp	hp-managed-node	hp performance data managed node
383	tcp, udp	hp-alarm-mgr	hp performance data alarm manager
384	tcp, udp	arns	A Remote Network Server System
385	tcp, udp	ibm-app	IBM Application
386	tcp, udp	asa	ASA Message Router Object Def.
387	tcp, udp	aurp	Appletalk Update-Based Routing Pro.
388	tcp, udp	unidata-ldm	Unidata LDM
389	tcp, udp	ldap	Lightweight Directory Access Protocol
390	tcp, udp	uis	UIS
391	tcp, udp	synotics-relay	SynOptics SNMP Relay Port
392	tcp, udp	synotics-broker	SynOptics Port Broker Port
393	tcp, udp	meta5	Meta5
394	tcp, udp	embl-ndt	EMBL Nucleic Data Transfer
395	tcp, udp	netcp	NetScout Control Protocol
396	tcp, udp	netware-ip	Novell Netware over IP
397	tcp, udp	mptn	Multi Protocol Trans. Net.
398	tcp, udp	kryptolan	Kryptolan
399	tcp, udp	iso-tsap-c2	ISO Transport Class 2 Non-Control over TCP
400	tcp, udp	osb-sd	Oracle Secure Backup
401	tcp, udp	ups	Uninterruptible Power Supply
402	tcp, udp	genie	Genie Protocol
403	tcp, udp	decap	decap
404	tcp, udp	nced	nced
405	tcp, udp	ncld	ncld
406	tcp, udp	imsp	Interactive Mail Support Protocol
407	tcp, udp	timbuktu	Timbuktu
408	tcp, udp	prm-sm	Prospero Resource Manager Sys. Man.
409	tcp, udp	prm-nm	Prospero Resource Manager Node Man.
410	tcp, udp	decladebug	DECLadebug Remote Debug Protocol
411	tcp, udp	rmt	Remote MT Protocol
412	tcp, udp	synoptics-trap	Trap Convention Port
413	tcp, udp	smsp	Storage Management Services Protocol
414	tcp, udp	infoseek	InfoSeek
415	tcp, udp	bnet	BNet
416	tcp, udp	silverplatter	Silverplatter
417	tcp, udp	onmux	Onmux
418	tcp, udp	hyper-g	Hyper-G
419	tcp, udp	ariel1	Ariel 1
420	tcp, udp	smpte	SMPTE
421	tcp, udp	ariel2	Ariel 2
422	tcp, udp	ariel3	Ariel 3
423	tcp, udp	opc-job-start	IBM Operations Planning and Control Start
424	tcp, udp	opc-job-track	IBM Operations Planning and Control Track
425	tcp, udp	icad-el	ICAD
426	tcp, udp	smartsdp	smartsdp
427	tcp, udp	svrloc	Server Location
428	tcp, udp	ocs-cmu (+1 more)	OCS_CMU IANA assigned this well-formed service name as a replacement for "ocs_cmu".
429	tcp, udp	ocs-amu (+1 more)	OCS_AMU IANA assigned this well-formed service name as a replacement for "ocs_amu".
430	tcp, udp	utmpsd	UTMPSD
431	tcp, udp	utmpcd	UTMPCD
432	tcp, udp	iasd	IASD
433	tcp, udp	nnsp	NNTP for transit servers (NNSP)
434	tcp, udp	mobileip-agent	MobileIP-Agent
435	tcp, udp	mobilip-mn	MobilIP-MN
436	tcp, udp	dna-cml	DNA-CML
437	tcp, udp	comscm	comscm
438	tcp, udp	dsfgw	dsfgw
439	tcp, udp	dasp	dasp
440	tcp, udp	sgcp	sgcp
441	tcp, udp	decvms-sysmgt	decvms-sysmgt
442	tcp, udp	cvc-hostd (+1 more)	cvc_hostd IANA assigned this well-formed service name as a replacement for "cvc_hostd".
443	sctp, tcp, udp	https	http protocol over TLS/SSL
444	tcp, udp	snpp	Simple Network Paging Protocol
445	tcp, udp	microsoft-ds	Microsoft-DS
446	tcp, udp	ddm-rdb	DDM-Remote Relational Database Access
447	tcp, udp	ddm-dfm	DDM-Distributed File Management
448	tcp, udp	ddm-ssl	DDM-Remote DB Access Using Secure Sockets
449	tcp, udp	as-servermap	AS Server Mapper
450	tcp, udp	tserver	Computer Supported Telecomunication Applications
451	tcp, udp	sfs-smp-net	Cray Network Semaphore server
452	tcp, udp	sfs-config	Cray SFS config server
453	tcp, udp	creativeserver	CreativeServer
454	tcp, udp	contentserver	ContentServer
455	tcp, udp	creativepartnr	CreativePartnr
456	tcp, udp	macon-tcp (+1 more)	macon-tcp
457	tcp, udp	scohelp	scohelp
458	tcp, udp	appleqtc	apple quick time
459	tcp, udp	ampr-rcmd	ampr-rcmd
460	tcp, udp	skronk	skronk
461	tcp, udp	datasurfsrv	DataRampSrv
462	tcp, udp	datasurfsrvsec	DataRampSrvSec
463	tcp, udp	alpes	alpes
464	tcp, udp	kpasswd	kpasswd
465	tcp, udp	urd (+2 more)	URL Rendezvous Directory for SSM
466	tcp, udp	digital-vrc	digital-vrc
467	tcp, udp	mylex-mapd	mylex-mapd
468	tcp, udp	photuris	proturis
469	tcp, udp	rcp	Radio Control Protocol
470	tcp, udp	scx-proxy	scx-proxy
471	tcp, udp	mondex	Mondex
472	tcp, udp	ljk-login	ljk-login
473	tcp, udp	hybrid-pop	hybrid-pop
474	tcp, udp	tn-tl-w1 (+1 more)	tn-tl-w1
475	tcp, udp	tcpnethaspsrv	tcpnethaspsrv
476	tcp, udp	tn-tl-fd1	tn-tl-fd1
477	tcp, udp	ss7ns	ss7ns
478	tcp, udp	spsc	spsc
479	tcp, udp	iafserver	iafserver
480	tcp, udp	iafdbase	iafdbase
481	tcp, udp	ph	Ph service
482	tcp, udp	bgs-nsi	bgs-nsi
483	tcp, udp	ulpnet	ulpnet
484	tcp, udp	integra-sme	Integra Software Management Environment
485	tcp, udp	powerburst	Air Soft Power Burst
486	tcp, udp	avian	avian
487	tcp, udp	saft	saft Simple Asynchronous File Transfer
488	tcp, udp	gss-http	gss-http
489	tcp, udp	nest-protocol	nest-protocol
490	tcp, udp	micom-pfs	micom-pfs
491	tcp, udp	go-login	go-login
492	tcp, udp	ticf-1	Transport Independent Convergence for FNA
493	tcp, udp	ticf-2	Transport Independent Convergence for FNA
494	tcp, udp	pov-ray	POV-Ray
495	tcp, udp	intecourier	intecourier
496	tcp, udp	pim-rp-disc	PIM-RP-DISC
497	tcp, udp	retrospect	Retrospect backup and restore service
498	tcp, udp	siam	siam
499	tcp, udp	iso-ill	ISO ILL Protocol
500	tcp, udp	isakmp	isakmp
501	tcp, udp	stmf	STMF
502	tcp, udp	mbap	Modbus Application Protocol
503	tcp, udp	intrinsa	Intrinsa
504	tcp, udp	citadel	citadel
505	tcp, udp	mailbox-lm	mailbox-lm
506	tcp, udp	ohimsrv	ohimsrv
507	tcp, udp	crs	crs
508	tcp, udp	xvttp	xvttp
509	tcp, udp	snare	snare
510	tcp, udp	fcp	FirstClass Protocol
511	tcp, udp	passgo	PassGo
512	tcp, udp	exec (+1 more)	remote process execution; authentication performed using passwords and UNIX login names
513	tcp, udp	login (+1 more)	remote login a la telnet; automatic authentication performed based on priviledged port numbers and distributed data bases which identify "authentication domains"
514	tcp	shell	cmd like exec, but automatic authentication is performed as for login server
515	tcp, udp	printer	spooler
516	tcp, udp	videotex	videotex
517	tcp, udp	talk	like tenex link, but across machine - unfortunately, doesn't use link protocol (this is actually just a rendezvous port from which a tcp connection is established)
519	tcp, udp	utime	unixtime
520	tcp, udp	efs (+1 more)	extended file name server
521	tcp, udp	ripng	ripng
522	tcp, udp	ulp	ULP
523	tcp, udp	ibm-db2	IBM-DB2
524	tcp, udp	ncp	NCP
525	tcp, udp	timed	timeserver
526	tcp, udp	tempo	newdate
527	tcp, udp	stx	Stock IXChange
528	tcp, udp	custix	Customer IXChange
529	tcp, udp	irc-serv	IRC-SERV
530	tcp, udp	courier	rpc
531	tcp, udp	conference	chat
532	tcp, udp	netnews	readnews
533	tcp, udp	netwall	for emergency broadcasts
534	tcp, udp	windream	windream Admin
535	tcp, udp	iiop	iiop
536	tcp, udp	opalis-rdv	opalis-rdv
537	tcp, udp	nmsp	Networked Media Streaming Protocol
538	tcp, udp	gdomap	gdomap
539	tcp, udp	apertus-ldp	Apertus Technologies Load Determination
540	tcp, udp	uucp	uucpd
541	tcp, udp	uucp-rlogin	uucp-rlogin
542	tcp, udp	commerce	commerce
544	tcp, udp	kshell	krcmd
545	tcp, udp	appleqtcsrvr	appleqtcsrvr
546	tcp, udp	dhcpv6-client	DHCPv6 Client
547	tcp, udp	dhcpv6-server	DHCPv6 Server
548	tcp, udp	afpovertcp	AFP over TCP
549	tcp, udp	idfp	IDFP
550	tcp, udp	new-rwho	new-who
551	tcp, udp	cybercash	cybercash
552	tcp, udp	devshr-nts	DeviceShare
553	tcp, udp	pirp	pirp
554	tcp, udp	rtsp	Real Time Streaming Protocol (RTSP)
556	tcp, udp	remotefs	rfs server
557	tcp, udp	openvms-sysipc	openvms-sysipc
558	tcp, udp	sdnskmp	SDNSKMP
559	tcp, udp	teedtap	TEEDTAP
560	tcp, udp	rmonitor	rmonitord
562	tcp, udp	chshell	chcmd
563	tcp, udp	nntps	nntp protocol over TLS/SSL (was snntp)
564	tcp, udp	9pfs	plan 9 file service
565	tcp, udp	whoami	whoami
566	tcp, udp	streettalk	streettalk
567	tcp, udp	banyan-rpc	banyan-rpc
568	tcp, udp	ms-shuttle	microsoft shuttle
569	tcp, udp	ms-rome	microsoft rome
570	tcp, udp	meter	demon
571	tcp, udp	meter	udemon
572	tcp, udp	sonar	sonar
573	tcp, udp	banyan-vip	banyan-vip
574	tcp, udp	ftp-agent	FTP Software Agent System
575	tcp, udp	vemmi	VEMMI
576	tcp, udp	ipcd	ipcd
577	tcp, udp	vnas	vnas
578	tcp, udp	ipdd	ipdd
579	tcp, udp	decbsrv	decbsrv
580	tcp, udp	sntp-heartbeat	SNTP HEARTBEAT
581	tcp, udp	bdp	Bundle Discovery Protocol
582	tcp, udp	scc-security	SCC Security
583	tcp, udp	philips-vc	Philips Video-Conferencing
584	tcp, udp	keyserver	Key Server
586	tcp, udp	password-chg	Password Change
587	tcp, udp	submission	Message Submission
588	tcp, udp	cal	CAL
589	tcp, udp	eyelink	EyeLink
590	tcp, udp	tns-cml	TNS CML
591	tcp, udp	http-alt	FileMaker, Inc. - HTTP Alternate (see Port 80)
592	tcp, udp	eudora-set	Eudora Set
593	tcp, udp	http-rpc-epmap	HTTP RPC Ep Map
594	tcp, udp	tpip	TPIP
595	tcp, udp	cab-protocol	CAB Protocol
596	tcp, udp	smsd	SMSD
597	tcp, udp	ptcnameservice	PTC Name Service
598	tcp, udp	sco-websrvrmg3	SCO Web Server Manager 3
599	tcp, udp	acp	Aeolon Core Protocol
600	tcp, udp	ipcserver	Sun IPC server
601	tcp, udp	syslog-conn	Reliable Syslog Service
602	tcp, udp	xmlrpc-beep	XML-RPC over BEEP
603	tcp, udp	idxp	IDXP
604	tcp, udp	tunnel	TUNNEL
605	tcp, udp	soap-beep	SOAP over BEEP
606	tcp, udp	urm	Cray Unified Resource Manager
607	tcp, udp	nqs	nqs
608	tcp, udp	sift-uft	Sender-Initiated/Unsolicited File Transfer
609	tcp, udp	npmp-trap	npmp-trap
610	tcp, udp	npmp-local	npmp-local
611	tcp, udp	npmp-gui	npmp-gui
612	tcp, udp	hmmp-ind	HMMP Indication
613	tcp, udp	hmmp-op	HMMP Operation
614	tcp, udp	sshell	SSLshell
615	tcp, udp	sco-inetmgr	Internet Configuration Manager
616	tcp, udp	sco-sysmgr	SCO System Administration Server
617	tcp, udp	sco-dtmgr	SCO Desktop Administration Server
618	tcp, udp	dei-icda	DEI-ICDA
619	tcp, udp	compaq-evm	Compaq EVM
620	tcp, udp	sco-websrvrmgr	SCO WebServer Manager
621	tcp, udp	escp-ip	ESCP
622	tcp, udp	collaborator	Collaborator
623	tcp, udp	oob-ws-http (+1 more)	DMTF out-of-band web services management protocol
624	tcp, udp	cryptoadmin	Crypto Admin
625	tcp, udp	dec-dlm (+1 more)	DEC DLM IANA assigned this well-formed service name as a replacement for "dec_dlm".
626	tcp, udp	asia	ASIA
627	tcp, udp	passgo-tivoli	PassGo Tivoli
628	tcp, udp	qmqp	QMQP
629	tcp, udp	3com-amp3	3Com AMP3
630	tcp, udp	rda	RDA
631	tcp, udp	ipp (+1 more)	IPP (Internet Printing Protocol)
632	tcp, udp	bmpp	bmpp
633	tcp, udp	servstat	Service Status update (Sterling Software)
634	tcp, udp	ginad	ginad
635	tcp, udp	rlzdbase	RLZ DBase
636	tcp, udp	ldaps	ldap protocol over TLS/SSL (was sldap)
637	tcp, udp	lanserver	lanserver
638	tcp, udp	mcns-sec	mcns-sec
639	tcp, udp	msdp	MSDP
640	tcp, udp	entrust-sps	entrust-sps
641	tcp, udp	repcmd	repcmd
642	tcp, udp	esro-emsdp	ESRO-EMSDP V1.3
643	tcp, udp	sanity	SANity
644	tcp, udp	dwr	dwr
645	tcp, udp	pssc	PSSC
646	tcp, udp	ldp	LDP
647	tcp, udp	dhcp-failover	DHCP Failover
648	tcp, udp	rrp	Registry Registrar Protocol (RRP)
649	tcp, udp	cadview-3d	Cadview-3d - streaming 3d models over the internet
650	tcp, udp	obex	OBEX
651	tcp, udp	ieee-mms	IEEE MMS
652	tcp, udp	hello-port	HELLO_PORT
653	tcp, udp	repscmd	RepCmd
654	tcp, udp	aodv	AODV
655	tcp, udp	tinc	TINC
656	tcp, udp	spmp	SPMP
657	tcp, udp	rmc	RMC
658	tcp, udp	tenfold	TenFold
660	tcp, udp	mac-srvr-admin	MacOS Server Admin
661	tcp, udp	hap	HAP
662	tcp, udp	pftp	PFTP
663	tcp, udp	purenoise	PureNoise
664	tcp, udp	oob-ws-https (+1 more)	DMTF out-of-band secure web services management protocol
665	tcp, udp	sun-dr	Sun DR
666	tcp, udp	doom	doom Id Software
667	tcp, udp	disclose	campaign contribution disclosures - SDR Technologies
668	tcp, udp	mecomm	MeComm
669	tcp, udp	meregister	MeRegister
670	tcp, udp	vacdsm-sws	VACDSM-SWS
671	tcp, udp	vacdsm-app	VACDSM-APP
672	tcp, udp	vpps-qua	VPPS-QUA
673	tcp, udp	cimplex	CIMPLEX
674	tcp, udp	acap	ACAP
675	tcp, udp	dctp	DCTP
676	tcp, udp	vpps-via	VPPS Via
677	tcp, udp	vpp	Virtual Presence Protocol
678	tcp, udp	ggf-ncp	GNU Generation Foundation NCP
679	tcp, udp	mrm	MRM
680	tcp, udp	entrust-aaas	entrust-aaas
681	tcp, udp	entrust-aams	entrust-aams
682	tcp, udp	xfr	XFR
683	tcp, udp	corba-iiop	CORBA IIOP
684	tcp, udp	corba-iiop-ssl	CORBA IIOP SSL
685	tcp, udp	mdc-portmapper	MDC Port Mapper
686	tcp, udp	hcp-wismar	Hardware Control Protocol Wismar
687	tcp, udp	asipregistry	asipregistry
688	tcp, udp	realm-rusd	ApplianceWare managment protocol
689	tcp, udp	nmap	NMAP
690	tcp, udp	vatp	Velneo Application Transfer Protocol
691	tcp, udp	msexch-routing	MS Exchange Routing
692	tcp, udp	hyperwave-isp	Hyperwave-ISP
693	tcp, udp	connendp	almanid Connection Endpoint
694	tcp, udp	ha-cluster	ha-cluster
695	tcp, udp	ieee-mms-ssl	IEEE-MMS-SSL
696	tcp, udp	rushd	RUSHD
697	tcp, udp	uuidgen	UUIDGEN
698	tcp, udp	olsr	OLSR
699	tcp, udp	accessnetwork	Access Network
700	tcp, udp	epp	Extensible Provisioning Protocol
701	tcp, udp	lmp	Link Management Protocol (LMP)
702	tcp, udp	iris-beep	IRIS over BEEP
704	tcp, udp	elcsd	errlog copy/server daemon
705	tcp, udp	agentx	AgentX
706	tcp, udp	silc	SILC
707	tcp, udp	borland-dsj	Borland DSJ
709	tcp, udp	entrust-kmsh	Entrust Key Management Service Handler
710	tcp, udp	entrust-ash	Entrust Administration Service Handler
711	tcp, udp	cisco-tdp	Cisco TDP
712	tcp, udp	tbrpf	TBRPF
713	tcp, udp	iris-xpc	IRIS over XPC
714	tcp, udp	iris-xpcs	IRIS over XPCS
715	tcp, udp	iris-lwz	IRIS-LWZ
716	udp	pana	PANA Messages
729	tcp, udp	netviewdm1	IBM NetView DM/6000 Server/Client
730	tcp, udp	netviewdm2	IBM NetView DM/6000 send/tcp
731	tcp, udp	netviewdm3	IBM NetView DM/6000 receive/tcp
741	tcp, udp	netgw	netGW
742	tcp, udp	netrcs	Network based Rev. Cont. Sys.
744	tcp, udp	flexlm	Flexible License Manager
747	tcp, udp	fujitsu-dev	Fujitsu Device Control
748	tcp, udp	ris-cm	Russell Info Sci Calendar Manager
749	tcp, udp	kerberos-adm	kerberos administration
750	udp	kerberos-iv	kerberos version iv
754	tcp, udp	tell	send
767	tcp, udp	phonebook	phone
774	udp	acmaint-dbd	IANA assigned this well-formed service name as a replacement for "acmaint_dbd".
775	udp	acmaint-transd	IANA assigned this well-formed service name as a replacement for "acmaint_transd".
777	tcp, udp	multiling-http	Multiling HTTP
800	tcp, udp	mdbs-daemon	IANA assigned this well-formed service name as a replacement for "mdbs_daemon".
802	tcp, udp	mbap-s	Modbus Application Protocol Secure
810	tcp, udp	fcp-udp	FCP
828	tcp, udp	itm-mcell-s	itm-mcell-s
829	tcp, udp	pkix-3-ca-ra	PKIX-3 CA/RA
830	tcp, udp	netconf-ssh	NETCONF over SSH
847	tcp, udp	dhcp-failover2	dhcp-failover 2
848	tcp, udp	gdoi	GDOI
853	tcp, udp	domain-s	DNS query-response protocol run over TLS
854	tcp, udp	dlep	Dynamic Link Exchange Protocol (DLEP)
860	tcp, udp	iscsi	iSCSI
861	tcp, udp	owamp-control (+1 more)	OWAMP-Control
862	tcp, udp	twamp-control (+1 more)	TWAMP-Control
873	tcp, udp	rsync	rsync
886	tcp, udp	iclcnet-locate	ICL coNETion locate server
887	tcp, udp	iclcnet-svinfo (+1 more)	ICL coNETion server info IANA assigned this well-formed service name as a replacement for "iclcnet_svinfo".
888	tcp, udp	accessbuilder (+1 more)	AccessBuilder
900	tcp, udp	omginitialrefs	OMG Initial Refs
901	tcp, udp	smpnameres	SMPNAMERES
902	tcp, udp	ideafarm-door	self documenting Telnet Door
903	tcp, udp	ideafarm-panic	self documenting Telnet Panic Door
910	tcp, udp	kink	Kerberized Internet Negotiation of Keys (KINK)
911	tcp, udp	xact-backup	xact-backup
912	tcp, udp	apex-mesh	APEX relay-relay service
913	tcp, udp	apex-edge	APEX endpoint-relay service
914	udp	rift-lies	Routing in Fat Trees Link Information Element
915	udp	rift-ties	Routing in Fat Trees Topology Information Element
953	tcp	rndc	BIND9 remote name daemon controller
989	tcp, udp	ftps-data	ftp protocol, data, over TLS/SSL
990	tcp, udp	ftps	ftp protocol, control, over TLS/SSL
991	tcp, udp	nas	Netnews Administration System
992	tcp, udp	telnets	telnet protocol over TLS/SSL
993	tcp	imaps	IMAP over TLS protocol
995	tcp, udp	pop3s	POP3 over TLS protocol
996	tcp, udp	vsinet	vsinet
999	udp	applix	Applix ac
1001	tcp	webpush	HTTP Web Push
1010	tcp, udp	surf	surf
1021	dccp, sctp, tcp, udp	exp1	RFC3692-style Experiment 1
1022	dccp, sctp, tcp, udp	exp2	RFC3692-style Experiment 2

Reading the list

The system ports run from 0 to 1023 and are the numbers that standard services use. Many entries are old protocols that you will never meet. The ones that matter today are in the topic pages: web, email, remote access, file transfer, databases and network services. "(+N more)" means the registry lists N more services for the same number; open the port page or search on the port numbers page to see them.

A registration shows what a number was reserved for. It does not prove what is running on a port, and a service can use any port you configure. See what is a port number.

This is an independent guide. It is not connected with IANA, the IETF or any network equipment maker. Address and port data come from the IANA registries as fetched on 14 November 2026; RFC texts were read from rfc-editor.org. Check the originals for anything you rely on.