testIP Address Classes

  • IP class A addresses have first octets with a decimal number from 1 to 127. Example: 27.x.y.z 102.x.y.z
  • IP class B addresses have first octets with a decimal number from 128 to 191.Example: 128.x.y.z 151.x.y.z
  • IP class C addresses have first octets with a decimal number from 192 to 223.Example: 192.x.y.z 223.x.y.z
  • IP class D addresses have decimal values from 224 to 239 in the first octet, and the 4 leftmost bits are 1110.Example: 224.x.y.z 239.x.y.z
  • The last IP address class of addresses is IP class E. IP class E addresses range from 240 to 255 in the first octet, and the 4 leftmost bits are 1111. Example: 240.x.y.z 255.x.y.z

from here

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