Instruction manual

XBLUE Networks 251
Glossary of Terms
13
Well Known Ports - Personal Computers have approximately 64,000 “virtual” Ports, each can be used for specific
tasks. For example, Port 80 is used to access the Internet, Port 25 is used for SMTP, etc. There are a group of these
ports that are called “Commonly Open” or “Well Known Ports” and generally are between 0 and 1023. In table 9.2
there is a list of “Well Known Ports” and some Not so “Well Known Ports”.
TABLE 13.2 Well Known Ports
Port Number Description
21 FTP
23 Telnet
25 SMTP
53 Domain Name Server (DNS)
80 HTTP - Commonly known as the Internet
110 POP3
119 Network News Transfer Protocol
125 NTP (Network Time Protocol)
143 IMAP
220 IMAP Version 3
389 LDAP
443 HTTPS
531 AOL Instant Messenger (Unofficial)
636 LDAPS
953 DNS
992 Telnet over TLS/SSL
993 IMAPS
995 POP3 over TLS/SSL
1194 Open VPN
3101 Blackberry Enterprise Server (Unofficial)
3389 Microsoft Remote Server (Remote Desk Top)
5060 SIP
5061 SIP over TLS
5500 VNC remote Desktop Protocol (Unofficial)
5631 PC Anywhere (data)
5632 PC Anywhere (Status)
5800 VNC over HTTP (Unofficial)
5900 Virtual Network Computing (VNC) - Apple Remote Desktop
5938 Team Viewer Remote Desktop (Unofficial)
6891 - 6900 Windows Live Messenger - File Transfer (Unofficial)
6901 Windows Live MEssenger - Voice (Unofficial)
8008 HTTP Alternate
23399 Skype (Unofficial)