Technical Reference
OPEN824RL / RLW ADSL / VoIP Routers
97
Table 5: Well-known and registered Ports
Port Number
Protocol
Description
20 TCP
FTP
Data
21 TCP
FTP
Control
22
TCP & UDP
SSH Remote Login Protocol
23 TCP
Telnet
25
TCP
SMTP (Simple Mail Transfer Protocol)
53
TCP & UDP
DNS (Domain Name Server)
69
UDP
TFTP (Trivial File Transfer Protocol)
80
TCP
World Wide Web HTTP
110
TCP
POP3 (Post Office Protocol Version 3)
119
TCP
NEWS (Network News Transfer Protocol)
123
UDP
NTP (Network Time Protocol)
161 TCP
SNMP
443
TCP & UDP
HTTPS
1503 TCP
T.120
1720 TCP
H.323
4000 TCP
ICQ
7070 UDP
RealAudio