Don’t you hate those scenarios where you need to block an odd port using an ACL. I’ve found that if you do >telnet 1.1.1.1 ? the cisco router will list all the port numbers; ready for you to pick for your ACL. Nice

e.g.

SW4#telnet 1.1.1.1 ?
/debug             Enable telnet debugging mode
/encrypt           Negotiate telnet encryption
/ipv4              Force use of IP version 4
/ipv6              Force use of IP version 6
/line              Enable telnet line mode
/noecho            Disable local echo
/quiet             Suppress login/logout messages
/route:            Enable telnet source route mode
/source-interface  Specify source interface
/stream            Enable stream processing
/terminal-type     Set terminal type
<0-65535>          Port number
bgp                Border Gateway Protocol (179)
chargen            Character generator (19)
cmd                Remote commands (rcmd, 514)
daytime            Daytime (13)
discard            Discard (9)
domain             Domain Name Service (53)
drip               Dynamic Routing Information Protocol (3949)
echo               Echo (7)
exec               Exec (rsh, 512)
finger             Finger (79)
ftp                File Transfer Protocol (21)
ftp-data           FTP data connections (20)
gopher             Gopher (70)
hostname           NIC hostname server (101)
ident              Ident Protocol (113)
irc                Internet Relay Chat (194)
klogin             Kerberos login (543)
kshell             Kerberos shell (544)
login              Login (rlogin, 513)
lpd                Printer service (515)
nntp               Network News Transport Protocol (119)
pim-auto-rp        PIM Auto-RP (496)
pop2               Post Office Protocol v2 (109)
pop3               Post Office Protocol v3 (110)
smtp               Simple Mail Transport Protocol (25)
sunrpc             Sun Remote Procedure Call (111)
syslog             Syslog (514)
tacacs             TAC Access Control System (49)
talk               Talk (517)
telnet             Telnet (23)
time               Time (37)
uucp               Unix-to-Unix Copy Program (540)
whois              Nicname (43)
www                World Wide Web (HTTP, 80)
<cr>

I hope it helps.

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