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THE NL3ASD ELEKTRONIC PAGES - THE PORT NUMBER
| SERVICE | PORT NUMBER | PROTOCOL |
ALIAS | DESCRIPTION | | | | | | | | Echo | Portnumber 07 | TCP | | | | Echo | Portnumber 07 | UDP | | |
| Discard |
Portnumber 09 | TCP | Sink Null | | | Discard | Portnumber 09 | UDP | Sink Null | | | Systat | Portnumber 11 | TCP |
Users |
Active users | | Systat | Portnumber 11 | UDP | Users | Active users | | Daytime | Portnumber 13 | TCP | | | | Daytime | Portnumber 13 |
UDP | | | | Qotd | Portnumber 17 | TCP | Quote | Quote of the day | | Qotd | Portnumber 17 | UDP | Quote | Quote of the day |
| Chargen |
Portnumber 19 | TCP | ttytst source | Character generator | | Chargen | Portnumber 19 | UDP | ttytst source | Character generator | | FTP Data | Portnumber 20 |
TCP | FTP | Data | | FTP | Portnumber 21 | TCP | FTP | Control | | Telnet | Portnumber 23 | TCP | | |
| SMTP |
Portnumber 25 | TCP | Mail | Simple Mail Transfer Protocol | | Time | Portnumber 37 | TCP | Time | Time Server | | Time | Portnumber 37 | UDP | Time |
Time Server | | | | | | Resource Location Protocol | | | | | Name | Host Name Server | | | | |
Name |
Host Name Server | | | | | Whois | | | | | | | Domain Name Server | | | | |
| Domain Name Server |
| | | | dhcps | Bootstrap Protocol Server | | | | | dhcpc | Bootstrap Protocol Client | | | | |
| Trivial File
Transfer | | | | | www www-http | World Wide Web | | | | | | |
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