IPv4 Classes: First Octet Value Range
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First octet value range from X to X. Example for class B: Public IP Range: 128.0.0.0 - 191.255.0.0. 

  • A 1-126
  • B 128 - 191
  • C 192 - 223
  • D 224 - 239
  • E 240 - 254

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