Internet Protocol is a routed protocol used to Send Packet
Class A 0-126
Class B 128-191
Class C 192-223
Class D 224-239
Class E 240-255
IP Address No. 127 is reserved for Loopback Testing
Default Subnet Mask
A 255.0.0.0
B 255.255.0.0
C 255.255.255.0
Network Means No. of ON Bits(1)
Host Means No. of OFF bits(0)
Class A => 8/24 i.e. 8 ON & 24 OFF
Class B => 16/16 i.e. 16 ON & 16 OFF
Class C => 24/8 i.e. 24 ON & 8 OFF
SOME QUERIES
Default Network and Host
Class A
7 ON 2^7 (7 is the Power of 2) = 128 Network
24 OFF 2^24-2 (24 is the Power of 2)=16777214 Host
Class B
14 ON 2^14 (14 is the power of 2) = 16384 Network
16 OFF 2^16-2 (I6 is the power of 2)= 65534 Host
Class C
21 ON 2^21 (21 is the power of 2) = 2097152 Network
8 OFF 2^8-2 (8 is the power of 2) = 254 Host
