- IAB - Internet Architecture Board
- IAS - Internet Authentication Server
- IBM PC - International Business Machine Personal Computer
- IBM - International Business Machine
- IBT - Internet Based Training
- IC - Integrated Circuit
- ICL - International Computers Limited
- ICT - Information Communication Technology
- IDPF - International Digital Publishing Forum
- IESG - Internet Engineering Steering Board
- IEEE - Institute of Electronic and Electrical Engineering
- IETF - Internet Engineering Task Force
- IIS - Internet Information Server
- IKBS - Intelligent Knowledge Based System
- INIC - Internet Network Information Centre
- Internet - International Network (Netscape)
- IO - Input / Output
- IP - Internet Protocol
- IPO - Input Process Output
- IPOD - Intelligent Portable Ocular Device
- IPX - Internetwork Packed Exchange
- IPX/SPX - Internetwork Packet Exchange / Sequence Packet Exchange
- IRC - Internet Relay Chat
- IRTB - Industrial Real Time Basic
- ISA - Industry Standard Architecture
- ISD - International Subscriber Dialing
- ISDN - Integrated Services Digital Network
- ISO - International Organization for Standardization (View)
- ISOC - Internet Society
- ISP - Internet Service Provider
- IT - Information Technology
- ITPDC - Information Technology Park Development
- ITPF - Information Technology Professional Forum
- IXP or IX - Internet eXchange Point. (View)
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