I's

IA- Intel Architecture
IAB - Internet Activities Board
IAD - Integrated Access Device
IAM - Inverse ATM Mux
IBM - International Business Machines
IBS - IntelSat Business Service
IC- Integrated Circuit
ICD - Internation Code Designation
ICE - Intrusion Countermeasure Electronics
ICMP- Internet Control Message Protocol
ICR - Intelligent Charachter Recognition
ICRIS - Integrated Customer Record Information System
IDE - Integrated Drive Electronics
IDSL- ISDN Digital Subscriber Line
IEEE- Institute of Electronic and Electrical Engineers
IEN - Integrated Enterprise Network
IESG- Internet Engineering Steering Group
IETF- Internet Engineering Task Force
IFM - Intelligent Flow Management
IGMP- Internet Group Multicast Protocol
IGP - Interior Gateway Protocol
IIOP- Internet Inter-ORB Protocol
IIS - Internet Information Services
IISP- Interim Inter-Switch Protocol
ILMI- Integrated Layer Management Interface
IMAP- Internet Messaging Access Protocol
IMC - Initial Microcode Load
IMP - Interface Message Processor
IMUX- Inverse Multiplexing
IN- Intelligent Network
INTELSAT- International Telecommunications Satellite Organization
InterNIC- Internet Network Information Center
INWG- International Network Working Group
I/O - Input / Output
IOS - Inter-Network Operating System
IP- Internet Protocol
IPC - Internet Proxy Cache
IPL - Initial Program Load
IPMI- Internet Provider Multicast Initiative
IPN - Internet Protocol Number
IPNG- Internet Protocol - Next Generation
IPv4- Internet Protocol version 4
IPv6- Internet Procotol version 6
IPX - Internetwork Packet Exchange
IRC - Internet Relay Chat
IRF - Inherited Rights Filter
IRL - In Real Life
IRQ - Interrupt - Request Line
IRTF- Internet Research Task Force
IRTOS - I2O Real-Time Operating System
ISA - Industry Standard Architecture
ISA - Interactive Services Association
ISDN- Integrated Services Digital Network
ISIS- Internally Switched Interface System
ISIS- Investigative Support Information System
ISM - Internet Service Manager
ISMF- Interactive Storage Management Facility
ISO - International Standards Organization
ISP - Internet Service Provider
ISPA- Inverted Socket Process Architecture
ISPF/PDF- Interactive System Productivity Facility / Program Development Facility
IT- Information Technology
ITS - Internet Telephony Server
ITT - International Telephone & Telegraph
ITTA- Information Technology Training Association
ITU - International Telecommunications Union
ITV - Interactive Television
IWM - Integrated Woz Machine
IXC - InterExchange Carrier