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IP address
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An identifier for a computer or device on a TCP/IP network. Networks using the TCP/IP protocol route messages based on the IP address of the destination. The format of an IP address is a 32-bit numeric address written as four numbers separated by periods. Each number can be zero to 255. For example, 1.160.10.240 could be an IP address.

Within an isolated network, you can assign IP addresses at random as long as each one is unique. However, connecting a private network to the Internet requires using registered IP addresses (called Internet addresses) to avoid duplicates.

The four numbers in an IP address are used in different ways to identify a particular network and a host on that network. The InterNIC Registration Service assigns Internet addresses from the following three classes.

  • Class A - supports 16 million hosts on each of 127 networks
  • Class B - supports 65,000 hosts on each of 16,000 networks
  • Class C - supports 254 hosts on each of 2 million networks
  • The number of unassigned Internet addresses is running out, so a new classless scheme called CIDR is gradually replacing the system based on classes A, B, and C and is tied to adoption of IPv6.



    For internet.com pages about IP address, . Also, check out the following links!


    More Information

    Outstanding Page Understanding IP addressing
    Excellent overview of IP addressing from 3Com. Also includes a large section on subnetting. Updated on Jul 3, 1998

      Changing an IP address in Windows 95
    Provides simple instructions for changing an IP address in Windows 95.

      IP address to longtitude/latitude
    Provides a form that converts host names, domain names, or IP addresses to locations with longitude and latitude data. US sites are resolved to the city, Canadian sites to their province, and other non-US sites to the country's capital. Updated on Dec 18, 1997

      IP addressing tutorial
    This short tutorial convers the basics of IP addressing and includes a form to enter an IP address and find out its class, network address and node address. Updated on Aug 4, 1998

      IP Network Numbers
    An index relating IP network numbers to network names and identities, for class A, B and C networks

      LearnToSubnet.Com
    An educational course on addressing TCP/IP Networks that includes IP Addresses and Subnetting. Topics include: Binary Math, IP Addressing (IP Address), Subnet Mask, and Custom Subnet Mask.

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