TCP 0 Reserved
TCP 1 Port Service Multiplexer
TCP 2 Management Utility
TCP 3 Compression Process
TCP 4 Unassigned
TCP 5 Remote Job Entry
TCP 6 Unassigned
TCP 7 Echo
TCP 8 Unassigned
TCP 9 Discard
TCP 10 Unassigned
TCP 11 Active Users
TCP 12 Unassigned
TCP 13 Daytime (RFC 867)
TCP 14 Unassigned
TCP 15 Unassigned [was netstat]
TCP 16 Unassigned
TCP 17 Quote of the Day
TCP 18 Message Send Protocol
TCP 19 Character Generator
TCP 20 File Transfer [Default Data]
TCP 21 File Transfer [Control]
TCP 22 SSH Remote Login Protocol
TCP 23 Telnet
TCP 24 any private mail system
TCP 25 Simple Mail Transfer
TCP 26 Unassigned
TCP 27 NSW User System FE
TCP 28 Unassigned
TCP 29 MSG ICP
TCP 30 Unassigned
TCP 31 MSG Authentication
TCP 32 Unassigned
TCP 33 Display Support Protocol
TCP 34 Unassigned
TCP 35 any private printer server
TCP 36 Unassigned
TCP 37 Time / W32.Sober.I virus
TCP 38 Route Access Protocol
TCP 39 Resource Location Protocol
TCP 40 Unassigned
TCP 41 Graphics
TCP 42 Host Name Server
TCP 43 WhoIs
TCP 44 MPM FLAGS Protocol
TCP 45 Message Processing Module [recv]
TCP 46 MPM [default send]
TCP 47 NI FTP
TCP 48 Digital Audit Daemon
TCP 49 Login Host Protocol (TACACS)
TCP 50 Remote Mail Checking Protocol
TCP 51 IMP Logical Address Maintenance
TCP 52 XNS Time Protocol