| Wert | Bedeutung |
|---|
| AA | Circuit switching |
| AB | SITA |
| AC | ARINC |
| AD | AT&T mailbox |
| AE | Peripheral device |
| AF | U.S. Defense Switched Network |
| AG | U.S. federal telecommunications system |
| AH | World Wide Web |
| AI | International calling country code |
| AJ | Alternate telephone |
| AK | Videotex number |
| AL | Cellular phone |
| AM | International telephone direct line |
| AN | O.F.T.P. (ODETTE File Transfer Protocol) |
| AO | Uniform Resource Location (URL) |
| AP | Very High Frequency (VHF) radio telephone |
| AQ | X.400 address for mail text |
| AR | AS1 address |
| AS | AS2 address |
| AT | AS3 address |
| AU | File Transfer Protocol |
| AV | Inmarsat call number |
| AW | Radio communication call sign |
| CA | Cable address |
| EI | EDI transmission |
| EM | Electronic mail |
| EX | Extension |
| F | X.400 address |
| FT | File transfer access method |
| FX | Telefax |
| G | Pager |
| GM | GEIS (General Electric Information Service) mailbox |
| H | International telephone switchboard |
| I | National telephone direct line |
| IE | IBM information exchange |
| IM | Internal mail |
| J | National telephone switchboard |
| MA | Mail |
| PB | Postbox number |
| PS | Packet switching |
| SW | S.W.I.F.T. |
| TE | Telephone |
| TG | Telegraph |
| TL | Telex |
| TM | Telemail |
| TT | Teletext |
| TX | TWX |
