Cisco CISCO877-SEC-K9 Configuration Guide - Page 187
Keyword, Description, Table D-1, Currently Assigned TCP and UDP Port Numbers
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Page 187 highlights
D A P P E N D I X Common Port Assignments OL-5332-01 Table D-1 lists currently assigned Transmission Control Protocol (TCP) port numbers. To the extent possible, the User Datagram Protocol (UDP) uses the same numbers. Table D-1 Currently Assigned TCP and UDP Port Numbers Port Keyword 0 - 1-4 - 5 RJE 7 ECHO 9 DISCARD 11 USERS 13 DAYTIME 15 NETSTAT 17 QUOTE 19 CHARGEN 20 FTP-DATA 21 FTP 23 TELNET 25 SMTP 37 TIME 39 RLP 42 NAMESERVER 43 NICNAME 49 LOGIN 53 DOMAIN 67 BOOTPS 68 BOOTPC 69 TFTP 75 - Description Reserved Unassigned Remote job entry Echo Discard Active users Daytime Who is up or NETSTAT Quote of the day Character generator File Transfer Protocol (data) File Transfer Protocol Terminal connection Simple Mail Transport Protocol Time Resource Location Protocol Hostname server Who is Login Host Protocol Domain name server Bootstrap Protocol Server Bootstrap Protocol Client Trivial File Transfer Protocol Any private dial-out service Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide D-1