| Abbreviation | Definition |
|---|---|
| IFAS | Integrated Frame Analysis System |
| IFD | Instantaneous Frame Description |
| IFP | Internet Facsimile Protocol |
| IFS | Installable File System |
| IFS | Interim Facility Share |
| IFS | IOS File System (Cisco) |
| IFSF | Instant FTP for Spool Files |
| IFSP | Initial Future Service Plan |
| IFVP | Internet Fibre Channel Protocol |
| IGA | In Group Allowed |
| IGMP | Internet Group Management Protocol |
| IGNIVANCE | Igniting Novel Growth through Innovation, Vision, Agility, Networking, Collaboration, and Entreprene |
| IGP | Interior Gateway Protocol |
| IGP | Intermediate Gatway Protocol |
| IGP | Internal Gateway Protocol |
| IGRP | Interior Gateway Routing Protocol |
| IGU | Integrated Gateway Unit |
| IH | Invocation Handle |
| IHL | Internet Header Length |
| IID | Instance IDentifier |