Appendix List of Port Numbers of Common Protocols

**Table 1** Port numbers of routing protocols
Routing Protocol	UDP Port Number	TCP Port Number
RIP	520	-
RIPv2	520	-
RIPng	521	-
BGP	-	179
OSPF	-	-
IS-IS	-	-
Note that "-" indicates that the related transport layer protocol is not used.

**Table 2** Port numbers of application layer protocols
Application Layer Protocol	UDP Port Number	TCP Port Number
DHCP	67/68	-
DNS	53	53
FTP	-	20/21
HTTP	-	80
IMAP	-	993
NetBIOS	137/138	137/139
POP3	-	995
SMB	445	445
SMTP	25	25
SNMP	161	-
TELNET	-	23
TFTP	69	-
Note that "-" indicates that the related transport layer protocol is not used.