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Network Classes

Different Classes of Network

IP addresses are divided into classes based on the first octet, defining the default size of the network part and the host part:

  • Class A: Addresses 1.0.0.0 to 126.255.255.255, typically used in large networks.
    • Subnet mask: 255.0.0.0
  • Class B: Addresses 128.0.0.0 to 191.255.255.255, suitable for medium-sized organizations.
    • Subnet mask: 255.255.0.0
  • Class C: Addresses 192.0.0.0 to 223.255.255.255, commonly used in smaller businesses.
    • Subnet mask: 255.255.255.0
  • Class D: Reserved for multicast addresses.
  • Class E: Reserved for experimental purposes.