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Ports for Internet Services :

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Any Port in a Datastorm

It seems like every day there is a new Internet service that uses some new set of poorly-documented, unregistered ports. I created this page to gather together all the information I could find about the ports used by these new services, for use by firewall administrators and other network monitors.

  • "dyn" in the ports field denotes dynamically allocated port(s), usually in the range >=1024 <=65535
  • A name in the ports field (e.g. LDAP) indicates that service is also required
  • A plus sign + in the ports field indicates the service may use a series of ports starting at the specified one
  • An asterisk * in the Notes field indicates that the ports are IANA registered

When a specific port is registered it is usually assigned for both TCP and UDP even though only one or the other may be required. Where possible I have only shown the required ones.

This is not intended to list old, well-documented services such as telnet, FTP, SMTP etc. You can find these in the IANA list.

You may contact me by email with any suggestions or corrections, or post a message to the TCP/IP Ports discussion.

Ports for Internet Services

Service TCP UDP Notes
SSH 22 Secure Shell *
HTTP 80 HyperText Transfer Protocol * (e.g. for web browsing). Currently (2003-07-05) HTTP/1.1 is officially described in RFC 2616.
RPC Endpoint Mapper 135 135 * registered as "epmap - DCE endpoint resolution". Used by Microsoft for RPC locator service. See additional information.
LDAP 389 389 Lightweight Directory Access Protocol *
MS NetMeeting LDAP or ULP, dyn >=1024, 1503, H.323 HostCall, MS ICCP dyn >=1024 videoconferencing
Timbuktu 1417-1420 407 remote control *
SLP 427 427 Service Location Protocol * Used by MacOS.
HTTPs 443 secure HTTP (SSL) *
ULP 522 522 User Location Protocol (Microsoft) *
AppleTalk Filing Protocol (AFP) 548 548 *
QuickTime 4 RTSP RTP-QT4 streaming audio, video *
RTSP 554 Real Time Streaming Protocol *. Currently (2003-07-05) described in RFC 2326.
NNTPs 563 secure NNTP news (SSL) *
Internet Printing Protocol (IPP) 631 631 print remotely to any IPP enabled printer through the Internet * The Common Unix Printing System (CUPS) is based on IPP.
LDAPs 636 636 secure LDAP * (LDAP protocol over TLS/SSL)
Doom 666 666 network game *
Remotely Possible (ControlIT) 799 remote control. CA ControlIT support.
SOCKS 1080 internet proxy *
Lotus Notes Domino 1352 *
VocalTec Internet Phone 1490, 6670, 25793 22555 videoconferencing *
Citrix ICA 1494, dyn >=1023 1604, dyn >=1023 remote application access *
Virtual Places 1533 conferencing *, also see VP voice
Xing StreamWorks 1558 streaming video *
Novell GroupWise (Remote Client) 1677 1677 group collaboration * NOTE: Other features of GroupWise use many other ports.
H.323 Host Call 1720 1720 H.323 host call *
PPTP 1723 virtual private network (VPN) * Note PPTP also uses the GRE protocol. However Microsoft says in Understanding PPTP: "PPTP can be used with most firewalls and routers by enabling traffic destined for port 1723 to be routed through the firewall or router."
MS ICCP 1731 1731 audio call control (Microsoft) *
MS NetShow 1755 1755, dyn >=1024 <=5000 streaming video *
MSN Messenger 1863 instant messenging *. NOTE: For file transfer or voice chat ports and NAT information for Messenger 3 see MS Support article Q278887. For Messenger 4 see the detailed document on Windows Messenger XP
Netopia netOctopus 1917, 1921 1917 network management *
ICU II 2000-2003 videoconferencing. NOTE: security risk on TCP port 50000
iSpQ 2000-2003 videoconferencing. Note: support docs are inconsistent on what ports are required
glimpseserver 2001 search engine
Distributed.Net RC5/DES 2064 distributed computation
SoulSeek 2234, 5534 2234, 5534 file sharing
Netrek 2592 network game *
squid 3128 3130 web proxy cache
Windows Remote Desktop Protocol (RDP) 3389 * registered as ms-wbt-server. RDP 5.1 is the current version. See below for more information. Remote Desktop Web Connection also uses HTTP.
Virtual Places Voice Chat 3450, 8000-9000 voice chat, also see Virtual Places
Apple iTunes music sharing (DAAP) 3689 3689 Digital Audio Access Protocol *
Mirabilis ICQ dyn >=1024 4000 locator, chat (note: see newer AOL ICQ)
Blizzard / 4000, 6112-6119 4000, 6112-6119 network gaming - support (captured 2001-11-11), proxy and firewall info
Abacast 4000-4100, 4500, 9000-9100 peer-to-peer audio and video streaming. NOTE: This software will create OUTGOING streams to other users if it can.
GlobalChat client, server 4020 4020 chat rooms, used to be called ichat
PGPfone 4747 secure phone
PlayLink 4747, 4748, 10090 6144 online games
radmin 4899 4899 remote control
Yahoo Messenger - Voice Chat 5000-5001 5000-5010 voice chat
GnomeMeeting H.323 HostCall, 30000-30010 5000-5003, 5010-5013 audio and videoconference. 5000-5003 is RTP and RTCP range for this app.
Yahoo Messenger - messages 5050 messaging. NOTE: It will try ports 5050, 80, any port.
SIP 5060 5060 Session Initiation Protocol *. For audio and video. Currently (2003-07-05) see RFCs 3261, 3262, 3263, 3264, 3265
Apple iChat AV SIP, RTP-iChatAV audio and video conferencing. May also need iChat local port.
Yahoo Messenger - Webcams 5100 video
AOL Instant Messenger (AIM) 5190 5190 America OnLine * Also used by Apple iChat (in AIM compatibility mode).
AOL ICQ 5190, dyn >=1024 messaging
AOL 5190-5193 5190-5193 America OnLine *
iChat local traffic 5298 5298 Some Rendezvous thing.
Multicast DNS 5353 5353 * Mac OS X 10.2: About Multicast DNS. Related to Zeroconf which Apple has implemented as Rendezvous. (Note: the regular Domain Name Service port is 53.) 5354, 7175, 8680-8890, 9000, 9450-9460 dyn >=1024 telephony
HotLine 5500-5503 peer-to-peer filesharing.
pcAnywhere 5631 5632 remote control *
eShare Chat Server 5760
eShare Web Tour 5761
eShare Admin Server 5764
VNC 5800+, 5900+ remote control
GNUtella 6346, 6347 6346, 6347 peer-to-peer file sharing *
Netscape Conference H.323 HostCall, 6498, 6502 2327 audioconferencing
Danware NetOp Remote Control 6502 6502 remote control
common IRC 6665-6669 Internet Relay Chat *
Net2Phone CommCenter selected 6801, selected telephony, admin should select one TCP and UDP port in the range 1-3000. Same ports are used by Yahoo Messenger - PC-to-Phone.
VDOLive 7000 user-specified streaming video
RTP-QT4 6970-6999 Realtime Transport Protocol. (These ports are specifically for the Apple QT4 version.)
Real Audio & Video RTSP, 7070 6970-7170 streaming audio and video
CU-SeeMe, Enhanced CUSM 7648, 7649, LDAP 7648-7652, 24032 videoconferencing
common HTTP 8000, 8001, 8080
Apache JServ Protocol v12 (ajp12) 8007 8007 (default port) See Workers HowTo for config info.
Apache JServ Protocol v13 (ajp13) 8009 8009 (default port) e.g. Apache mod_jk Tomcat connector using ajp13. See Workers HowTo for config info.
iVisit 9943, 9945, 56768 videoconferencing
The Palace 9992-9997 9992-9997 chat environment *
common Palace 9998 chat environment
Yahoo Games 11999 network games
RTP-iChatAV 16384-16403 Used by Apple iChat AV.
RTP 16384-32767 Realtime Transport Protocol. RTP in general is described in RFC 1889. This range is not registered (it never could be, being so broad) but it seems to be somewhat common. See Are there specific ports assigned to RTP?
Palm Computing Network Hotsync 14237 14238 data synchronization
Liquid Audio 18888 streaming audio
FreeTel 21300-21303 audioconferencing
VocalTec Internet Conference 22555 22555 audio & document conferencing *
Quake 26000 26000 network game *
MSN Gaming Zone 28800-29000 28800-29000 network gaming
Sygate Manager 39213
DirectX Gaming 47624, 2300-2400 47624, 2300-2400 many network games


After examining Napster, I decided it was such a complex protocol that it deserved its own section. The first thing to be aware of is that there are two versions of Napster. The "original" flavor is what most people will be interested in. This is the full music file-sharing service. This original service provided by has now been shut down. will be providing a new service with much more controlled music sharing. However, the original protocol lives on, and the protocol has been analyzed so that people could write compatible applications for many different operating systems.

There is information on the protocol (and how to get it through your firewall) from:

Here is a summary of the TCP ports it uses. I have put the notation (primary) after the main port, if more than one port is listed.

  • metaserver / redirector: 8875
  • directory servers: 4444, 5555, 6666, 7777, 8888 (primary)
  • client: 6600 to 6699 (primary)


PalTalk is another messy service that uses many ports, more than I want to summarize here. Visit their support page: Getting PalTalk To Work With Your Firewall Or Network.

Obsolete Services

Apple released QuickTime 4 some time ago. I am unsure of the status of their older QuickTime Conferencing (MovieTalk) protocol. All of the applications that supported it (Connectix VideoPhone, Apple VideoPhone, Netscape CoolTalk, QuickTime TV) are no longer supported and the QuickTime Conferencing website is gone.

Service TCP UDP Notes
QuickTime Conferencing (MovieTalk) 458 458, dyn >= 7000 videoconferencing *
Apple VideoPhone MovieTalk MovieTalk videoconferencing *
Connectix VideoPhone MovieTalk MovieTalk, dyn >=1024, 4242 videoconferencing
Netscape CoolTalk 6499, 6500 13000 videoconferencing

Official TCP/IP Port Assignments

Also note, although you will sometimes see mention of RFC 1700 "Assigned Numbers" (dated October 1994) it was long ago obsoleted by the official IANA list. Do not use RFC 1700 as a reference. This fact is now officially documented by RFC 3232 "Assigned Numbers: RFC 1700 is Replaced by an On-line Database".

Network Sorcery lists the IANA TCP/UDP Ports with links to pages describing some protocols in detail, as part of its incredibly useful RFC Sourcebook.

Searchable Port Lists

These cover registered, unregistered, and trojan ports - note that many ports have legitimate, required uses, even though people have also used them as trojan ports.

Understanding TCP/IP

The IBM RedBooks are an amazing resource for many technical topics. They have a TCP/IP Tutorial and Technical Overview available as HTML or 7.7 MB PDF.

Cisco also provides excellent information online. Internet Protocols is just one section of their Internetworking Technology Handbook.

There is information on IP (the protocol on which TCP and UDP are built) in Internet Core Protocols: The Definitive Guide Sample Chapter 2: The Internet Protocol [IP].

Articles and Related Resources


More information about Windows Remote Desktop Protocol (RDP)

As indicated in the RDP section above, this protocol uses a registered TCP port. It is used for XP Pro Remote Desktop and XP Remote Assistance (read Administering Remote Assistance for a very good overview of firewall, NAT and blocking issues). Also used for WinNT4 Terminal Server, Win2000 Terminal Services, and Win .NET Server 2003 Terminal Server.

Windows Remote Procedure Call (RPC) and Distributed COM (DCOM)

In some cases, Microsoft uses port 135 as an RPC Endpoint Mapper. Runs as RPCSS on (some versions of?) Windows. This is a sort of "RPC directory" service which can be used to lookup what ports other services are running on. For some additional information, see Windows 2000 Network Architecture: Remote Procedure Call and NT Gatekeeper: RPC and Firewall Configuration.

MS-RPC on port 135 is required for some Exchange Server and Active Directory communications. See e.g. TCP Ports and Microsoft Exchange: In-depth Discussion and Restricting Active Directory Replication Traffic to a Specific Port.
However this port also poses a security risk, as indicated in the NET SEND section of my broadband security page.

UPDATE 2003-08-13: Also see the Blaster Worm section for information about this additional security risk.

Additional information:

Windows and MSN Messenger Application

A related note: the Messenger Service that runs at the Windows SERVICE level is different from the Windows or MSN Messenger application. For information about the Messenger APPLICATION see


OpenDoor (makers of DoorStop) have a nice list of MacOS-related ports, with hyperlinks to relevant information.

Apple support has provided a list of "Well Known" TCP and UDP Ports Used By Apple Software Products.

Novell (NetWare)

TCP/IP Port Numbers used by Novell Products

IP Telephony / Voice over IP (VoIP) / H.323 / SIP / RTP

Some applications that use H.323 include: ohphone, ohphoneX, ...

Getting H.323 audio/video conferencing through firewalls is particularly problematic. I have used Google cache to rescue an Intel document The Problems and Pitfalls of Getting H.323 Safely Through Firewalls. Note in particular that RTCP (Real Time Control Protocol) has no fixed port, an RTCP session is paired with an RTP session, if you have an RTP stream on even numbered UDP port x, RTCP is on x + 1.


The white paper Cisco PIX Firewall and Stateful Firewall Security contains some useful information about the ports and connection protocols for VDOnet, CU-SeeMe, and RealAudio.

Ed Bott's article Block those ports! contains some useful information, and also a kind review of this web page. He also links to my page from the Windows and Internet Security Information page on TCP and UDP ports.

You can check out Internet Firewalls: Frequently Asked Questions. As of this writing it was last updated 2000/12/01 but it still has lots of good information.

You may also find useful a list of ports specified in ipmasq format (actually it gives you sets of rules you can use with either ipchains or ipfwadm).

NetGear's Applications Port List lists a lot of games.

By popular request: a page on Blocking Chat Programs.

More and more good resources are becoming available, particularly for people with home networks. If you haven't found what you were looking for here, you can try:

Network Protocols

Note that certain services such as IPSec and Microsoft's PPTP use non-TCP/UDP protocols so they may be more complicated to use. In particular, PPTP uses GRE (protocol 47) and IPSec uses ESP (protocol 50) and AH (protocol 51). Protocol numbers are not the same as port numbers. IANA maintains the Assigned Internet Protocol Numbers.

Related Information: Trojan TCP/IP Ports, Free Firewall Book

Those of you concerned with Internet security may wish to also check out my companion page, Trojan TCP/IP Ports for a list of ports used by trojan horse and backdoor programs. Also I have a link to firewall books there (including a free book).


If you have questions, comments or suggestions specifically about this page or TCP/IP ports then you can email me or use my QuickTopic: Discuss TCP/IP Ports.

For firewall questions I suggest the USENET group via or your newsreader.

If your question is Microsoft-specific, you may want to try the USENET microsoft.public groups, in particular:

Copyright 1996-2003 Richard Akerman. All rights reserved. No mirroring without prior written consent.

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