- merupakan alamat untuk sender & receiver
- PC ~ PC
- PC ~ Router
~Class of IP Address~
Class A - 0nnnnnnn hhhhhhhh hhhhhhhh hhhhhhhh
· First bit 0; 7 network bits; 24 host bits
· Initial byte: 0 - 127
· 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 D are multicast addresses
Class E - 1111rrrr rrrrrrrr rrrrrrrr rrrrrrrr
· First four bits 1111; 28 reserved address bits
· Initial byte: 248 - 255
· Reserved for experimental use
