from RFC1700
| Decimal | Keyword | Protocol | References |
| 0 | Reserved | ||
| 1 | tcpmux | TCP Port Service Multiplexer | |
| 2 | compressnet | Management Utility | |
| 3 | compressnet | Compression Process | |
| 4 | Unassigned | ||
| 5 | rje | Remote Job Entry | |
| 6 | Unassigned | ||
| 7 | echo | Echo | |
| 8 | Unassigned | ||
| 9 | discard | Discard | |
| 10 | Unassigned | ||
| 11 | systat | Active Users | |
| 12 | Unassigned | ||
| 13 | daytime | Daytime | |
| 14 | Unassigned (was netstat) | ||
| 15 | Unassigned | ||
| 16 | Unassigned | ||
| 17 | qotd | Quote of the Day | |
| 18 | msp | Message Send Protocol | |
| 19 | chargen | Character Generator | |
| 20 | ftp-data | File Transfer Protocol (Defult Data) | |
| 21 | ftp | File Transfer Protocol (Control) | |
| 22 | Unassigned | ||
| 23 | telnet | Telnet | |
| 24 | any private mail system | ||
| 25 | smtp | Simple Mail Transfer Protocol | |
| 26 | Unassigned | ||
| 27 | nsw-fe | NSW User System FE | |
| 28 | Unassigned | ||
| 29 | msg-icp | MSG ICP | |
| 30 | Unassigned | ||
| 31 | msg-auth | MSG Authentication | |
| 32 | Unassigned | ||
| 33 | dsp | Display Support Protocol | |
| 34 | Unassigned | ||
| 35 | any private printer server | ||
| 36 | Unassigned | ||
| 37 | time | Time | |
| 38 | rap | Route Access Protocol | |
| 39 | rlp | Resource Location Protocol | |
| 40 | Unassigned | ||
| 41 | graphics | Graphics | |
| 42 | nameserver | Host Name Server | |
| 43 | nicname | Who Is | |
| 44 | mpm-flags | MPM FLAGS Protocol | |
| 45 | mpm | Messege Processing Protocol (recieve) | |
| 46 | mpm-send | MPM (defult send) | |
| 47 | ni-ftp | NI FTP | |
| 48 | auditd | Digital Audit Daemon | |
| 49 | login | Login Host Protocol | |
| 50 | re-mail-ck | Remote Mail Checking Protocol | |
| 51 | la-maint | IMP-Logical Address Maintenance | |
| 52 | xns-time | XNS Time Protocol | |
| 53 | domain | Domain Name Server | |
| 54 | xns-ch | XNS Clearinghouse | |
| 55 | isi-gl | ISI Graphics Langauge | |
| 56 | xns-auth | XNS Authentication | |
| 57 | any private terminal access | ||
| 58 | xns-mail | XNS Mail | |
| 59 | any private file service | ||
| 60 | Unassigned | ||
| 61 | ni-mail | NI Mail | |
| 62 | acas | ACA Services | |
| 63 | Unassigned | ||
| 64 | covia | Communication Interger (CI) | |
| 65 | tacacs-ds | TACACS-Database Server | |
| 66 | sql*net | Oracle SQL*NET | |
| 67 | bootps | Bootstrap Protocol Server | |
| 68 | bootpc | Bootstrap Protocol Client | |
| 69 | tftp | Trivial File Transfer Protocol | |
| 70 | gopher | Gopher | |
| 71 | netrjs-1 | Remote Job Sevices Protocol | |
| 72 | netrjs-2 | ||
| 73 | netrjs-3 | ||
| 74 | netrjs-4 | ||
| 75 | any private dial out service | ||
| 76 | deos | Distributed External Object Store | |
| 77 | any private RJE service | ||
| 78 | vettecp | vettecp | |
| 79 | finger | Finger | |
| 80 | www-http | World Wide Web - HTTP | |
| 81 | hosts2-ns | HOSTS2 Name Server | |
| 82 | xfer | XFER Utility | |
| 83 | mit-ml-dev | MIT ML Device | |
| 84 | ctf | Common Trace Facility | |
| 85 | mit-ml-dev | MIT ML Device | |
| 86 | mfcobol | Micro Focus COBOL | |
| 87 | any private terminal link | ||
| 88 | kerberos | Kerberos | |
| 89 | su-mit-tg | SU / MIT Telnet Gateway | |
| 90 | dnsix | DNSIN Securit Attribute Token Map | |
| 91 | mit-dov | MIT Dover Spooler | |
| 92 | npp | Network Printing Protocol | |
| 93 | dcp | Device Control Protocol | |
| 94 | objcall | Tivoli Object Dispatcher | |
| 95 | supdup | SUPDUP | |
| 96 | dixie | DIXIE Protocol Specification | |
| 97 | swift-rvf | Swift Remote Virtual File Protocol | |
| 98 | tacnews | TAC News | |
| 99 | metagram | Metagram Relay | |
| 100 | newacct | unauthorized use | |
| 101 | hostname | NIC Host Name Server | |
| 102 | iso-tsap | ISO-TSAP | |
| 103 | gppitnp | Genesis Point to Point Trans Net | |
| 104 | acr-nema | ACR-NEMA Digital Imag. & Comm. 300 | |
| 105 | csnet-cs | Mailbox Name Nameserver | |
| 106 | 3com-tsmux | 3COM-TSMUX | |
| 107 | rtelnet | Remote Telnet Service | |
| 108 | snagas | SNA Gateway Server | |
| 109 | pop2 | Post Office Protocol - Version 2 | |
| 110 | pop3 | Post Office Protocol - Version 3 | |
| 111 | sunrpc | SUN Remote Procedure Call | |
| 112 | mcidas | McIDAS Data Transmission Protocol | |
| 113 | auth | Authentication Service | |
| 114 | audionews | Audio News Multicast | |
| 115 | sftp | Simple File Transfer Protocol | |
| 116 | ansanotify | ANSA REX Notify | |
| 117 | uucp-path | UUCP Path Service | |
| 118 | sql-serv | SQL Service | |
| 119 | nntp | Network News Transfer Protocol | |
| 120 | cfdptkt | CFDPTKT | |
| 121 | erpc | Encore Expidited Remote Pro.Call | |
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