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Appendix B - Well-Known TCP/UDP Ports
Service
Port Number/Port Type
File Transfer Protocol (FTP) Data
20/tcp
FTP Commands
21/tcp
Telnet
23/tcp
Simple Mail Transfer Protocol (SMTP) Email
25/tcp
Domain Name Server (DNS)
53/tcp and 53/udp
Trivial File Transfer Protocol (TFTP)
69/udp
finger
79/tcp
World Wide Web (HTTP)
80/tcp
POP3 Email
110/tcp
SUN Remote Procedure Call (RPC)
111/udp
Network News Transfer Protocol (NNTP)
119/tcp
Network Time Protocol (NTP)
123/tcp and 123/udp
News
144/tcp
Simple Management Network Protocol (SNMP)
161/udp
SNMP (traps)
162/udp
Border Gateway Protocol (BGP)
179/tcp
Secure HTTP (HTTPS)
443/tcp
rlogin
513/tcp
rexec
514/tcp
talk
517/tcp and 517/udp
ntalk
518/tcp and 518/udp
Open Windows
2000/tcp and 2000/udp
Network File System (NFS)
2049/tcp
X11
6000/tcp and 6000/udp
Routing Information Protocol (RIP)
520/udp
Layer 2 Tunnelling Protocol (L2TP)
1701/udp