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Class Full Addressing

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By Team EasyExamNotes

Classful addressing refers to the original method of IP address allocation in IPv4, which divided the available IP address space into five classes: Class A, Class B, Class C, Class D, and Class E.

Each class had a predefined range of network and host addresses, providing a structure for addressing and routing.

Different classes in classful addressing:

1. Class A:

  • Range: 1.0.0.0 to 126.0.0.0
  • Network ID: The first octet represents the network ID, and the remaining three octets represent the host ID.
  • Hosts per network: Can have up to 16,777,214 hosts per network.
  • Example: 10.0.0.0 is a Class A network address.

2. Class B:

  • Range: 128.0.0.0 to 191.255.0.0
  • Network ID: The first two octets represent the network ID, and the remaining two octets represent the host ID.
  • Hosts per network: Can have up to 65,534 hosts per network.
  • Example: 172.16.0.0 is a Class B network address.

3. Class C:

  • Range: 192.0.0.0 to 223.255.255.0
  • Network ID: The first three octets represent the network ID, and the last octet represents the host ID.
  • Hosts per network: Can have up to 254 hosts per network.
  • Example: 192.168.0.0 is a Class C network address.

4. Class D:

  • Range: 224.0.0.0 to 239.255.255.255
  • Purpose: Reserved for multicast addresses used for multicasting applications and services.
  • Notation: Starts with the leading bit pattern ‘1110’ in the first octet.

5. Class E:

  • Range: 240.0.0.0 to 255.255.255.255
  • Purpose: Reserved for experimental or future use.
  • Notation: Starts with the leading bit pattern ‘1111’ in the first octet.
ClassRange (First Octet)Network IDHost IDNumber of NetworksNumber of Hosts per Network
Class A1.0.0.0 to 126.0.0.0First OctetLast Three Octets12616,777,214
Class B128.0.0.0 to 191.255.0.0First Two OctetsLast Two Octets16,38465,534
Class C192.0.0.0 to 223.255.255.0First Three OctetsLast Octet2,097,152254
Class D224.0.0.0 to 239.255.255.255N/AN/AN/AN/A
Class E240.0.0.0 to 255.255.255.255N/AN/AN/AN/A
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