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there are Three famous classes ip that every one Know :
if the first octect has number between1:127 >> that class Aif the first octect has number between128:191 >> that class Bif the first octect has number between192:223 >> that class C
BUt there are class D and E Reserved for Scientific operation and Researches if the first octect has number between224:239 >> that class D if the first octect has number between240:255 >> that class E That All I Know
Class A from10.0.0.0 :10.255.255.255
Class B from172.16.0.0 :172.31.255.255
Class C From192.168.0.0 :192.168.255.255
Apipa from 169.254.0.1 :169.254.255.254
