1. ICP: Internet Cache Protocol.
  2. ICT: Information and Communication Technology.
  3. IDL: Interface Definition Language.
  4. IDE: Integrated Development Environment / Integrated Drive Electronics.
  5. IE: Internet Explorer.
  6. IGMP: Internet Group Management Protocol.
  7. IMAP: Internet Message Access Protocol.
  8. I/O: Input / Output.
  9. IP: Internet Protocol.
  10. IGRP: Interior Gateway Routing Protocol.
  11. IBM: International Business Machines.
  12. IC: Integrated Circuit.
  13. ICMP: Internet Control Message Protocol.
  14. IHV: Independent Hardware Vendor.
  15. IIOP: Internet Iner-Orb-Protocol.
  16. IIS: Internet Information Server.
  17. IM: Instant Messaging.
  18. IPC: Inter-Process Communication.
  19. IPP: Internet Printing Protocol.
  20. IPsec: Internet Protocol Security.
  21. IPTV: Internet Protocol Television.
  22. IPX: Internetwork Packet Exchange.
  23. IRC: Internet Relay Chat.
  24. IrDA: Infrared Data Association.
  25. IRP: I/O Request Packet.
  26. IRQ: Interrupt Request.
  27. ISC: Internet Storm Center.
  28. ISO: International Organisation for Standardization.
  29. IT: Information Technology.
  30. ITU: International Telecommunication Union.
  31. ISOC: Internet Society.
  32. ISP: Internet Service Provider.
  33. ISR: Interrupt Service Routine.
  34. ISV: Independent Software Vendor.