The first bit of the first octet is always set to 0 (zero). Thus the first octet ranges from 1
– 127, i.e.
Class A addresses only include IP starting from 1.x.x.x to 126.x.x.x only. The IP range
127.x.x.x is reserved for loopback IP addresses.
The default subnet mask for Class A IP address is 255.0.0.0 which implies that Class A
addressing can have 126 networks (27-2) and 16777214 hosts (224-2).
Class A IP address format is thus: 0NNNNNNN.HHHHHHHH.HHHHHHHH.HHHHHHHH
– 127, i.e.
127.x.x.x is reserved for loopback IP addresses.
The default subnet mask for Class A IP address is 255.0.0.0 which implies that Class A
addressing can have 126 networks (27-2) and 16777214 hosts (224-2).
Class A IP address format is thus: 0NNNNNNN.HHHHHHHH.HHHHHHHH.HHHHHHHH
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