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- It's a 32 bits, 4-part period delimited, decimal number called IP number or IP address:
www.xxx.yyy.zzz
- each part can vary from 1 to 254 (0 and 255 are reserved for the net and the broadcast)
- each network interface card attached to the Internet mast have an unique IP address
- the IP address can be splitted in two parts:
CLASSES:
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class A net: NNN.hhh.hhh.hhh
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NNN: 1 to 127
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class B net: NNN.nnn.hhh.hhh
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NNN: 128 to 191
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class C net: NNN.nnn.nnn.hhh
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NNN: 192 to 223
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