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Other Sites with related tables (many were the source for this one)
Standard Port Usage list (any system):
http://www.isi.edu/in-notes/iana/assignments/port-numbers
Help With Port Forwarding and Router Setups
http://www.portforward.com/
List of Linux port/trojan attack points:
http://www.linux-firewall-tools.com/linux/ports.html
Trojan Port Lists and Information (Windows Oriented):
http://www.simovits.com/nyheter9902.html
http://www.sys-security.com/html/papers/trojan_list.html
http://www.commodon.com/threat/threat-ports.htm
http://www.netice.com/Advice/Exploits/Ports/default.htm
Could this be a Hoax?
Virus and Trojan Myth Information
Hoax Busters Site
Kahl Site
Snopes Hoax Info Site
F-Secure Hoax Information
This list was built from several sources from various Internet Security oriented sites.  It is not a complete list, but does list over 400 ports that are known to be used by various Trojans.  The table is oriented toward attacks of Windows based systems.  Where a Transport entry is "???" it means that either the source did not specify the type of transport, or it could be either TCP or UDP.

If it is not in this list, try the "SUSPECT PORT" List - Has Ports Used by many Trojans and Viruses Listed:
Suspect Port List

Port Transport Possible Legitimate Use(s)
3 ??? Valid use - Game: F22
5 TCP Valid use - Apple Remote Desktop
22 TCP Valid use - AudioReQuest
22 UDP Valid Use - pcAnywhere Host, AudioReQuest
30 TCP Valid use - ATC Battlefield 1942, ATC Ghost Recon 2, ATC Splinter Cell Chaos Theory, ATC Splinter Cell Pandora Tomorrow
30 UDP Valid use - ATC Battlefield 1942, ATC Ghost Recon 2, ATC Splinter Cell Chaos Theory, ATC Splinter Cell Pandora Tomorrow
47 TCP Valid use - Battlefield VietNam
57 TCP Valid use - AudioReQuest
57 UDP Valid use - AudioReQuest
80 TCP Valid Use - Game: Aliens vs. Predator. Other: Dialpad, Yahoo File Transfer, BarracudaDrive, Battlefield 2
80 UDP Valid use - AudioReQuest
111 TCP Valid use - Battlefield VietNam
123 UDP Valid Use - Network Time Protocol
177 UDP Valid Use - Battle Realms-Ubisoft
300 TCP Valid use - Age of Empires III
328 TCP Valid use - Apple Remote Desktop
359 TCP Valid use - Apple Remote Desktop
367 UDP Valid use - Aleph One
389 ??? Valid use - PGP Automatic Verification.
422 UDP Valid use - Aleph One
443 TCP Valid use - BarracudaDrive
466 TCP Valid use - Battlefield VietNam
471 UDP Valid Use - Battle Realms-Ubisoft
500 ??? Valid use - PGP use, also other SSL encryption programs, Bay VPN (TCP & UDP)
515 ??? Valid use - Unix Printer Spooler.
554 TCP Valid Use - QuickTime 4 Client or RealAudio
615 UDP Valid use - Aleph One
717 UDP Valid Use - Battle Realms-Ubisoft
728 TCP Valid use - Battlefield VietNam
757 UDP Valid Use - Battle Realms-Ubisoft
799 TCP Valid Use - Remotely Possible Server
802 TCP Valid use - Age of Empires III
900 TCP Valid use - Battlefield VietNam
988 TCP Valid use - Apple Remote Desktop
1024 - 1124 TCP Valid use - Battlefield 2
1024 - 1124 UDP Valid use - Battlefield 2
1024 - 5000 TCP and UDP Valid use - AIM Video IM
1140 TCP Valid use - Dwyco Video Conferencing or Westwood Online - C&C Tiberian Sun, Dune 2000
1214 TCP Valid use - Dwyco Video Conferencing or Morpheus or Kazaa File Sharing
1234 TCP Valid use - Dwyco Video Conferencing or Westwood Online - C&C Tiberian Sun, Dune 2000
1352 TCP Valid use - Dwyco Video Conferencing or Lotus Notes Host
1414 UDP Valid use - CuSeeMe or Dwyco Video Conferencing
1424 UDP Valid use - CuSeeMe or Dwyco Video Conferencing
1500 - 4999  UDP Valid use - Battlefield 2
1503 TCP Valid use - CuSeeMe or Dwyco Video Conferencing
1547 TCP Valid Use - Laplink Host or Dwyco Video Conferencing
1584 TCP Valid use - Dialpad or Dwyco Video Conferencing
1585 TCP Valid use - Dialpad or Dwyco Video Conferencing
1680 TCP Valid use - Dwyco Video Conferencing or CarbonCopy v5.0
1716 UDP Valid use - America's Army
1717 UDP Valid use - America's Army
1718 UDP Valid use - America's Army
1720 TCP Valid use - CuSeeMe or Dwyco Video Conferencing
1812 UDP Valid use - CuSeeMe or Dwyco Video Conferencing
1813 UDP Valid use - CuSeeMe or Dwyco Video Conferencing
1863 TCP Valid use - Dwyco Video Conferencing or MSN Messenger
2090 TCP Valid use - Go2Call or Dwyco Video Conferencing or DynSite Updates
2091 TCP Valid use - Go2Call or Dwyco Video Conferencing
2233 TCP Valid use - Shiva VPN or Dwyco Video Conferencing
2346 TCP Valid Use - (game) Rainbow Six or Rogue Spear or Dwyco Video Conferencing
2300 - 2400 ??? Valid Use - Age of Empires, Age of Empires II (2300-2400 TCP and UDP and 47624 TCP)
Age of Empires III (2300-2310 UDP)
Alien vs Predator (UDP and TCP)
Battlecom (UDP and TCP)
3000 TCP Valid use - Dwyco Video Conferencing or Active Worlds File Transfers or Calista IP Phone (UDP in)
3333 TCP and UDP Valid use - ATC Battlefield 2, ATC Rainbow Six Lockdown
3389 TCP Valid use - Dwyco Video Conferencing or Windows 2000 Terminal Server
3453 TCP Valid use - Dwyco Video Conferencing or (games) Bungie.net, Myth, Myth II Server
3568 TCP Valid use - Dwyco Video Conferencing or (game) Delta Force
3660 TCP Valid use - AudioReQuest
3660 UDP Valid use - AudioReQuest
3663 TCP Valid use - AudioReQuest
3663 UDP Valid use - AudioReQuest
3823 UDP Valid use - Apple Remote Desktop
3996 TCP Valid use - Dwyco Video Conferencing or Remote Anything
3997 TCP Valid use - Dwyco Video Conferencing or Remote Anything
3998 TCP Valid use - Dwyco Video Conferencing or Remote Anything
3999 TCP Valid use - Dwyco Video Conferencing or Remote Anything
4000 TCP Valid use - Dwyco Video Conferencing or Remote Anything or (games) Westwood Online - C&C Tiberian Sun, Dune 2000, ICQ.
4099 TCP Valid use - Dwyco Video Conferencing or AIM Talk (out)
4226 TCP Valid use - Aleph One
4444 TCP Valid use - Dwyco Video Conferencing or Napster Directory Server
4555 UDP Valid use - Battlefield Vietnam
4556 UDP Valid use - Battlefield Vietnam
4557 UDP Valid use - Battlefield Vietnam
4660 TCP Valid use - Dwyco Video Conferencing or Voice-On-Net
4661 TCP Valid use - Dwyco Video Conferencing or Voice-On-Net
4662 TCP Valid use - Dwyco Video Conferencing or Voice-On-Net
4663 TCP Valid use - Dwyco Video Conferencing or Voice-On-Net
4664 TCP Valid use - Dwyco Video Conferencing or Voice-On-Net
4665 TCP Valid use - Dwyco Video Conferencing or Voice-On-Net,  AudioReQuest
4665 UDP Valid use - AudioReQuest
4666 TCP Valid use - Dwyco Video Conferencing or Voice-On-Net
4667 TCP Valid use - Dwyco Video Conferencing or Voice-On-Net
4668 TCP Valid use - Dwyco Video Conferencing or Voice-On-Net
4669 TCP Valid use - Dwyco Video Conferencing or Voice-On-Net
4670 TCP Valid use - Dwyco Video Conferencing or Voice-On-Net
4747 TCP Valid use - Apprentice
4871 ??? Valid use - 3-in-a-Bed
4899 TCP Valid use - Dwyco Video Conferencing or Radmin (Fama Tech)
5000 - 5010 UDP Valid use - Yahoo Voice Chat
5001 TCP Valid Use - (game) Ultima
5002 TCP Valid Use - (game) Ultima
5003 TCP Valid Use - (game) Ultima
5004 TCP Valid Use - (game) Ultima
5005 TCP Valid Use - (game) Ultima
5006 TCP Valid Use - (game) Ultima
5007 TCP Valid Use - (game) Ultima
5008 TCP Valid Use - (game) Ultima
5009 TCP Valid Use - (game) Ultima
5010 TCP Valid Use - (game) Ultima
5050 ??? Valid use - Yahoo Messenger
5100 TCP Valid use - Yahoo Super Webcam
5101 TCP Valid use - Yahoo P2P Instant Messages
5190 TCP Valid use - AIM Talk [AOL IM] (in) or Calista IP Phone (out).
5222 TCP Valid Use - KaVoom! (software KVM)
5310 ??? Valid Use - (game) Outlaws
5424 TCP Valid use - Beyond Remote
5424 UDP Valid use - Beyond Remote
5497 ??? Valid use - Hotline Connect
5498 ??? Valid use - Hotline Connect
5500 TCP Valid Use - Virtual Network Computing (VNC) or Hotline Connect
5501 ??? Valid use - Hotline Connect
5555 ??? Valid use - Napster directory server.
5631 TCP Valid Use - pcAnywhere Host
5632 UDP Valid Use - pcAnywhere Host
5670 TCP Valid Use - Active Worlds
5800 TCP Valid Use - Virtual Network Computing (VNC)
5900 TCP Valid Use - Virtual Network Computing (VNC)
6073 UDP Age of Empires (see also port #2300), Battlecom
6097 ??? Valid use - Napster Client
6112 UDP Valid Use - (game) Starcraft, Blueserver (TCP also)
6113 TCP and UDP Valid Use - Blueserver
6114 TCP and UDP Valid Use - Blueserver
6115 TCP and UDP Valid Use - Blueserver
6116 TCP and UDP Valid Use - Blueserver
6117 TCP and UDP Valid Use - Blueserver
6118 TCP and UDP Valid Use - Blueserver
6119 TCP and UDP Valid Use - Blueserver
6120 ??? Valid use - Napster Client
6336 ??? Valid use - Napster Client
6346 ??? Valid use - Gnutella file exchange. Also used by Napster Client.
6348 TCP Valid Use - Audio Galaxy (MP3 Sharing)
6666 TCP Valid use - Napster directory server or (game) KALI.  APC UPS Service.
6667 TCP Valid Use - MS Game Zone  APC UPS Service.
6668 TCP Valid Use - APC UPS Service.
6688 ??? Valid use - Possibly misconfigured Napster
6697 ??? Valid use - Napster Client
6698 ??? Valid use - Napster Client
6699 ??? Valid use - Napster Port (beta 7)
6801 UDP Valid use - Net2Phone (and any of 1-3000)
6880 TCP Valid use - Delta Three PC to Phone
6901 ??? Valid use - MSN Messenger (voice chat)
6970 TCP Valid use - QuickTime 4 Server or RealAudio (6970 through 7170)
7000 TCP Valid Use - Active Worlds (can use from 7000-7100)
7070 TCP Valid Use - Active Worlds (can use 7000-7100) or RealAudio
7640 TCP Valid use - CuSeeMe
7642 TCP Valid use - CuSeeMe
7648 ??? Valid use - CuSeeMe
7649 TCP Valid use - CuSeeMe
7775 TCP Valid Use - (game) Ultima
7776 TCP Valid Use - (game) Ultima
7777 ??? Valid use - Napster directory server or Active Worlds or (game) Ultima
7778 ??? Valid use - Unreal Tournament
7845 UDP Valid Use - (game) ZNES
7875 TCP Valid Use - (game) Ultima (UOMonitor)
8000 TCP Valid Use - ShoutCast Server or Game:
Aliens vs. Predator (8000-8999 TCP and UDP)
8001 TCP Valid Use - ShoutCast Server
8002 TCP Valid Use - ShoutCast Server
8003 TCP Valid Use - ShoutCast Server
8004 TCP Valid Use - ShoutCast Server
8005 TCP Valid Use - ShoutCast Server
8080 TCP Valid Use - Unreal Tourney Server Admin
8680 TCP Valid use - Dialpad
8681 TCP Valid use - Dialpad
8682 TCP Valid use - Dialpad
8683 TCP Valid use - Dialpad
8684 TCP Valid use - Dialpad
8685 TCP Valid use - Dialpad
8686 TCP Valid use - Dialpad
8777 UDP Valid use - America's Army
8875 ??? Valid use - Napster Redirector
8888 ??? Valid use - Napster directory server or OpenNap or (game) Ultima (patch)
9000 UDP Valid Use - Asheron's Call (in/out - May use from 9000-9013)
9001 UDP Valid Use - Asheron's Call (in)
9004 UDP Valid Use - Asheron's Call (in/out)
9005 UDP Valid Use - Asheron's Call (in)
9008 UDP Valid Use - Asheron's Call (out)
9012 UDP Valid Use - Asheron's Call (in/out)
9013 UDP Valid Use - Asheron's Call (in)
9442 UDP Valid Use - (game) Need for Speed - Porsche
9999 TCP Valid Use - (game) Ultima (patch)
10000 TCP Valid Use - Bit Tornado
10001 TCP Valid Use - Bit Tornado
10002 TCP Valid Use - Bit Tornado
10003 TCP Valid Use - Bit Tornado
10004 TCP Valid Use - Bit Tornado
10005 TCP Valid Use - Bit Tornado
10006 TCP Valid Use - Bit Tornado
10007 TCP Valid Use - Bit Tornado
10008 TCP Valid Use - Bit Tornado
10009 TCP Valid Use - Bit Tornado
10010 TCP Valid Use - Bit Tornado
11370 ??? Valid use - PGP Automatic Verification.
11371 ??? Valid use - PGP Automatic Verification.
12053 UDP Valid use - Dwyco Video Conferencing or Delta Three PC to Phone
12080 UDP Valid use - Dwyco Video Conferencing or Delta Three PC to Phone
12083 UDP Valid use - Dwyco Video Conferencing or Delta Three PC to Phone
12120 UDP Valid use - Dwyco Video Conferencing or Delta Three PC to Phone
12122 UDP Valid use - Dwyco Video Conferencing or Delta Three PC to Phone
14567 UDP Valid use - Battlefield 1942
15567 UDP Valid use - Battlefield Vietnam
15690 UDP Valid use - Battlefield Vietnam
16000 UDP Valid use - Dwyco Video Conferencing or (game) Motorhead Server
16567 UDP Valid use - Battlefield 2
20025 TCP Valid use - America's Army
20045 TCP Valid use - America's Army
20046 TCP Valid use - America's Army
22222 TCP Valid use - University of Ky: Internet Tic-Tac-Toe (Announce Messages)
22223 TCP Valid use - University of Ky: Internet Tic-Tac-Toe (Outcome Messages)
23000 UDP Valid use - Battlefield Vietnam
23001 UDP Valid use - Battlefield Vietnam
23002 UDP Valid use - Battlefield Vietnam
23003 UDP Valid use - Battlefield Vietnam
23004 UDP Valid use - Battlefield Vietnam
23005 UDP Valid use - Battlefield Vietnam
23006 UDP Valid use - Battlefield Vietnam
23007 UDP Valid use - Battlefield Vietnam
23008 UDP Valid use - Battlefield Vietnam
23009 UDP Valid use - Battlefield Vietnam
24032 UDP Valid use - CuSeeMe
24150 UDP Valid use - Delta Three PC to Phone
24151 UDP Valid use - Delta Three PC to Phone
24152 UDP Valid use - Delta Three PC to Phone
24153 UDP Valid use - Delta Three PC to Phone
24154 UDP Valid use - Delta Three PC to Phone
24155 UDP Valid use - Delta Three PC to Phone
24156 UDP Valid use - Delta Three PC to Phone
24157 UDP Valid use - Delta Three PC to Phone
24158 UDP Valid use - Delta Three PC to Phone
24159 UDP Valid use - Delta Three PC to Phone
24160 UDP Valid use - Delta Three PC to Phone
24161 UDP Valid use - Delta Three PC to Phone
24162 UDP Valid use - Delta Three PC to Phone
24163 UDP Valid use - Delta Three PC to Phone
24164 UDP Valid use - Delta Three PC to Phone
24165 UDP Valid use - Delta Three PC to Phone
24166 UDP Valid use - Delta Three PC to Phone
24167 UDP Valid use - Delta Three PC to Phone
24168 UDP Valid use - Delta Three PC to Phone
24169 UDP Valid use - Delta Three PC to Phone
24170 UDP Valid use - Delta Three PC to Phone
24171 UDP Valid use - Delta Three PC to Phone
24172 UDP Valid use - Delta Three PC to Phone
24173 UDP Valid use - Delta Three PC to Phone
24174 UDP Valid use - Delta Three PC to Phone
24175 UDP Valid use - Delta Three PC to Phone
24176 UDP Valid use - Delta Three PC to Phone
24177 UDP Valid use - Delta Three PC to Phone
24178 UDP Valid use - Delta Three PC to Phone
24179 UDP Valid use - Delta Three PC to Phone
26000 UDP Valid Use - Elite Force (game) - Quake
26214 ??? Valid Use - Dark Reigh 2 (game)
26900 UDP Valid Use - Hexen II (for 1st player)
27015 ??? Valid use - Half-Life Gamer Use Port - Team Fortress Classic (TFC) - Counterstrike - Day of Defeat
27374 ??? Valid use - Address Search Protocol (ASP - IANA)
27500 UDP Valid Use - Elite Force (game)
27900 UDP Valid Use - America's Army, Battlefield 2, Battlefield Vietnam
27910 UDP Valid use - Quake II Gamer Use Port or Elite Force
27960 UDP Valid use - Quake II Gamer Use Port or Elite Force
28910 ??? Valid use - Heretic II Gamer Use Port, Battlefield 2 (UDP)
28911 ??? Valid use - Heretic II Gamer Use Port
29900 TCP Valid use - Battlefield 2
29901 TCP Valid use - Battlefield 2
39213 UDP Valid use - Sygate Manager
44334 ??? Valid use - TinySoft Tiny Personal Firewall use.
44488 TCP and UDP Valid use - BackupStream
47624 TCP Valid use - Battlecom
51200 UDP Valid use - Dialpad
51201 UDP Valid use - Dialpad
51210 TCP Valid use - Dialpad
55123 UDP Valid use - Battlefield 2
55124 UDP Valid use - Battlefield 2
55125 UDP Valid use - Battlefield 2
56800 UDP Valid use - CuSeeMe