knownports / Port ranges / 0–99
System PortsPorts 0–99
IANA lists at least one assignment on 70 of the 100 numbers from 0 to 99, 70.0%. The longest stretch with no assignment on any protocol runs from 2 to 4 (3 numbers). 9, 20, 21, 22 and 80 have an SCTP entry as well.
Ports with their own page: 9 discard 21 ftp 80 http
Every assigned number from 0 to 99
0–99 · 70 numbers assigned
| Port | Service | Protocols | Label | Registered |
|---|---|---|---|---|
| 1 | tcpmux | TCPUDP | TCP Port Service Multiplexer | — |
| 5 | rje | TCPUDP | Remote Job Entry | — |
| 7 | echo | TCPUDP | Echo | — |
| 9 | discard | TCPUDPSCTPDCCP | Discard | — |
| 11 | systat | TCPUDP | Active Users | — |
| 13 | daytime | TCPUDP | Daytime | — |
| 17 | qotd | TCPUDP | Quote of the Day | — |
| 18 | msp | TCPUDP | Message Send Protocol (historic) | — |
| 19 | chargen | TCPUDP | Character Generator | — |
| 20 | ftp-data | TCPUDPSCTP | File Transfer [Default Data] | — |
| 21 | ftp | TCPUDPSCTP | File Transfer Protocol [Control] | — |
| 22 | ssh | TCPUDPSCTP | The Secure Shell (SSH) Protocol | — |
| 23 | telnet | TCPUDP | Telnet | — |
| 24 | reserved for private use | |||
| 25 | smtp | TCPUDP | Simple Mail Transfer | — |
| 27 | nsw-fe | TCPUDP | NSW User System FE | — |
| 29 | msg-icp | TCPUDP | MSG ICP | — |
| 31 | msg-auth | TCPUDP | MSG Authentication | — |
| 33 | dsp | TCPUDP | Display Support Protocol | — |
| 35 | reserved for private use | |||
| 37 | time | TCPUDP | Time | — |
| 38 | rap | TCPUDP | Route Access Protocol | — |
| 39 | rlp | TCPUDP | Resource Location Protocol | — |
| 41 | graphics | TCPUDP | Graphics | — |
| 42 | namenameserver | TCPUDP | Host Name Server Host Name Server | — |
| 43 | nicname | TCPUDP | Who Is | — |
| 44 | mpm-flags | TCPUDP | MPM FLAGS Protocol | — |
| 45 | mpm | TCPUDP | Message Processing Module [recv] | — |
| 46 | mpm-snd | TCPUDP | MPM [default send] | — |
| 48 | auditd | TCPUDP | Digital Audit Daemon | — |
| 49 | tacacs | TCPUDP | Login Host Protocol (TACACS) | — |
| 50 | re-mail-ck | TCPUDP | Remote Mail Checking Protocol | — |
| 52 | xns-time | TCPUDP | XNS Time Protocol | — |
| 53 | domain | TCPUDP | Domain Name Server | — |
| 54 | xns-ch | TCPUDP | XNS Clearinghouse | — |
| 55 | isi-gl | TCPUDP | ISI Graphics Language | — |
| 56 | xns-auth | TCPUDP | XNS Authentication | — |
| 57 | reserved for private use | |||
| 58 | xns-mail | TCPUDP | XNS Mail | — |
| 59 | reserved for private use | |||
| 62 | acas | TCPUDP | ACA Services | — |
| 63 | whoisppwhois++ | TCPUDP | whois++ whois++ | — |
| 64 | covia | TCPUDP | Communications Integrator (CI) | — |
| 65 | tacacs-ds | TCPUDP | TACACS-Database Service | — |
| 66 | sql-netsql*net | TCPUDP | Oracle SQL*NET Oracle SQL*NET | — |
| 67 | bootps | TCPUDP | Bootstrap Protocol Server | — |
| 68 | bootpc | TCPUDP | Bootstrap Protocol Client | — |
| 69 | tftp | TCPUDP | Trivial File Transfer | — |
| 70 | gopher | TCPUDP | Gopher | — |
| 71 | netrjs-1 | TCPUDP | Remote Job Service | — |
| 72 | netrjs-2 | TCPUDP | Remote Job Service | — |
| 73 | netrjs-3 | TCPUDP | Remote Job Service | — |
| 74 | netrjs-4 | TCPUDP | Remote Job Service | — |
| 75 | reserved for private use | |||
| 76 | deos | TCPUDP | Distributed External Object Store | — |
| 77 | reserved for private use | |||
| 78 | vettcp | TCPUDP | vettcp | — |
| 79 | finger | TCPUDP | Finger | — |
| 80 | httpwwwwww-http | TCPUDPSCTP | World Wide Web HTTP World Wide Web HTTP World Wide Web HTTP | — |
| 82 | xfer | TCPUDP | XFER Utility | — |
| 83 | mit-ml-dev | TCPUDP | MIT ML Device | — |
| 84 | ctf | TCPUDP | Common Trace Facility | — |
| 85 | mit-ml-dev | TCPUDP | MIT ML Device | — |
| 86 | mfcobol | TCPUDP | Micro Focus Cobol | — |
| 87 | reserved for private use | |||
| 88 | kerberos | TCPUDP | Kerberos | — |
| 89 | su-mit-tg | TCPUDP | SU/MIT Telnet Gateway | — |
| 90 | dnsix | TCPUDP | DNSIX Securit Attribute Token Map | — |
| 91 | mit-dov | TCPUDP | MIT Dover Spooler | — |
| 92 | npp | TCPUDP | Network Printing Protocol | — |
| 93 | dcp | TCPUDP | Device Control Protocol | — |
| 94 | objcall | TCPUDP | Tivoli Object Dispatcher | — |
| 95 | supdup | TCPUDP | SUPDUP | — |
| 96 | dixie | TCPUDP | DIXIE Protocol Specification | — |
| 97 | swift-rvf | TCPUDP | Swift Remote Virtural File Protocol | — |
| 98 | tacnews | TCPUDP | TAC News | — |
| 99 | metagram | TCPUDP | Metagram Relay | — |