What is the subnet mask of class a,b,c,d,e.and what is the minimum and maximum number of connections in class a,b,c,d,e

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netsolver

  • Jul 5th, 2008
 

N - network
H - Host


Class A - 0nnnnnnn hhhhhhhh hhhhhhhh hhhhhhhh

  • 126 Class As exist (0 and 127 are reserved)
  • 16,777,214 hosts on each Class A

  • Class B - 10nnnnnn nnnnnnnn hhhhhhhh hhhhhhhh
    • First two bits 10; 14 network bits; 16 host bits
    • Initial byte: 128 - 191
    • 16,384 Class Bs exist
    • 65,532 hosts on each Class B

    Class C - 110nnnnn nnnnnnnn nnnnnnnn hhhhhhhh
    • First three bits 110; 21 network bits; 8 host bits
    • Initial byte: 192 - 223
    • 2,097,152 Class Cs exist
    • 254 hosts on each Class C

    Class D - 1110mmmm mmmmmmmm mmmmmmmm mmmmmmmm
    • First four bits 1110; 28 multicast address bits
    • Initial byte: 224 - 247
    • Class Ds are multicast addresses - see RFC 1112

    Class E - 1111rrrr rrrrrrrr rrrrrrrr rrrrrrrr
    • First four bits 1111; 28 reserved address bits
    • Initial byte: 248 - 255
    • Reserved for experimental use

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