MSN messenger ports : 6891 - 6901->MSN voice telephony
some of the other ports part I :
1 : TCP/UDP TCP Port Service Multiplexer
2 : TCP/UDP Management Utility (Compressnet)
3 : TCP/UDP Compression Process (Compressnet)
5 : TCP/UDP Remote Job Entry (Rje)
7 : TCP/UDP Echo (Echo)
9 : TCP/UDP Discard (Discard)
11 : TCP/UDP Active Users (Systat)
13 : TCP/UDP Daytime (Rfc 867) (Daytime)
15 : TCP Netstat
17 : TCP/UDP Quote Of The Day (Qotd)
18 : TCP/UDP Message Send Protocol (Msp)
19 : TCP/UDP Character Generator (Chargen)
20 : TCP/UDP File Transfer Protocol [Default Data] (Ftp-Data) - Requires port 21 as well
21 : TCP/UDP File Transfer Protocol [Control] (Ftp) - Requires port 20 as well
22 : TCP/UDP Ssh Remote Login Protocol (Ssh)
23 : TCP/UDP Telnet (Telnet)
24 : TCP/UDP Any Private Mail System
25 : TCP/UDP Simple Mail Transfer (Smtp) (Smtp)
27 : TCP/UDP Nsw User System Fe (Nsw-Fe)
29 : TCP/UDP Msg Icp (Msg-Icp)
31 : TCP/UDP Msg Authentication (Msg-Auth)
33 : TCP/UDP Display Support Protocol (Dsp)
35 : TCP/UDP Any Private Printer Server
37 : TCP/UDP Time (Time)
38 : TCP/UDP Route Access Protocol (Rap)
39 : TCP/UDP Resource Location Protocol (Rlp)
41 : TCP/UDP Graphics (Graphics)
42 : TCP Host Name Server (Name)
42 : TCP Host Name Server (Nameserver)
43 : TCP/UDP Who Is (Nicname)
44 : TCP/UDP Mpm Flags Protocol (Mpm-Flags)
45 : TCP/UDP Message Processing Module [Recv] (Mpm)
46 : TCP/UDP Mpm [Default Send] (Mpm-Snd)
47 : TCP/UDP Ni Ftp (Ni-Ftp)
48 : TCP/UDP Digital Audit Daemon (Auditd)
49 : TCP/UDP Login Host Protocol (Tacacs) (Tacacs)
50 : TCP/UDP Remote Mail Checking Protocol (Re-Mail-Ck)