Understanding IP Addressing
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    • Understanding IP Addressing

    Mukesh Kumar Sharma

    SEO Internet Marketing Expert
    There are five classes of available IP ranges: Class A, Class B, ClassC, Class D and Class E, while only A, B and C are commonly used. Eachclass allows for a range of valid IP addresses. Below is a listing ofthese addresses.

    ClassAddress RangeSupports
    Class A1.0.0.1 to 126.255.255.254Supports 16 million hosts on each of 127 networks.
    Class B128.1.0.1 to 191.255.255.254Supports 65,000 hosts on each of 16,000 networks.
    Class C192.0.1.1 to 223.255.254.254Supports 254 hosts on each of 2 million networks.
    Class D224.0.0.0 to 239.255.255.255Reserved for multicast groups.
    Class E240.0.0.0 to 254.255.255.254Reserved for future use, or Research and Development Purposes.

    Class A Network -- binary address start with 0, therefore thedecimal number can be anywhere from 1 to 126. The first 8 bits (thefirst octet) identify the network and the remaining 24 bits indicatethe host within the network. An example of a Class A IP address is102.168.212.226, where "102" identifies the network and "168.212.226"identifies the host on that network.

    Class B Network -- binary addresses start with 10, therefore thedecimal number can be anywhere from 128 to 191. (The number 127 isreserved for loopbackand is used for internal testing on the local machine.) The first 16bits (the first two octets) identify the network and the remaining 16bits indicate the host within the network. An example of a Class B IPaddress is 168.212.226.204 where "168.212" identifies the network and"226.204" identifies the host on that network.

    Class C Network -- binary addresses start with 110, thereforethe decimal number can be anywhere from 192 to 223. The first 24 bits(the first three octets) identify the network and the remaining 8 bitsindicate the host within the network. An example of a Class C IPaddress is 200.168.212.226 where "200.168.212" identifies the networkand "226" identifies the host on that network.

    Class D Network -- binary addresses start with 1110, thereforethe decimal number can be anywhere from 224 to 239. Class D networksare used to support multicasting.

    Class E Network -- binary addresses start with 1111, thereforethe decimal number can be anywhere from 240 to 255. Class E networksare used for experimentation. They have never been documented orutilized in a standard way.



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