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Every application which intends to receive data from a TCP/IP network calls it TCP/IP service to acquire a "port," a 16-bit number which will uniquely belong to that application on that particular host. Any well-formed incoming datagram with that port number in its TCP or UDP headers will be delivered to that application. Fragmented datagrams only contain port information in the first datagram fragment (fragment 0). By convention, any transmitting application also owns a port number on its host, and it supplies that port number in the destination port field of the datagrams it sends. Table B-1 lists the TCP port assignment for each port.
Table B-1 : TCP Port Assignments
| Port # | Keyword | Protocol |
|---|---|---|
| 7 | ECHO | Echo |
| 9 | DISCARD | Discard |
| 11 | USERS | Active Users |
| 13 | DAYTIME | Daytime |
| 17 | QUOTE | Quote of the Day |
| 19 | CHARGEN | Character Generator |
| 20 | FTP-DATA | File Transfer (Default Data) |
| 21 | FTP | File Transfer (Control) |
| 23 | TELNET | Telnet |
| 25 | SMTP | Simple Mail Transfer |
| 37 | TIME | Time |
| 43 | NICNAME | Who Is |
| 53 | DOMAIN | Domain Name Server |
| 79 | FINGER | Finger |
| 101 | HOSTNAME | NIC Host Name Server |
| 103 | X400 | X400 |
| 104 | X400-SND | X400-SND |
| 113 | AUTH | Authentication Service |
| 117 | UUCP-PATH | UUCP Path Service |
| 119 | NNTP | USENETNetworkNewsTransferProtocol |
| 512 | rexec | UNIX rexec (Control) |
| 513 | rlogin | UNIX rlogin |
| 514 | rsh | UNIX rsh and rcp |
| 515 | UNIX Line Printer Remote Spooling |
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