1. 31.107.256.80 (Binary: 00011111 . 01101011 . 100000000 . 01010000)
This is a class A address. (first byte 31 is in 1 - 126)
NetID: 31
HostID: 107.256.80
This is a valid IP.
2. 0.127.4.100 (Binary: 00000000 . 01111111 . 00000100 . 01100100)
This is a class A address. (first byte is 0)
NetID: 0
HostID: 127.4.100
This is NOT a valid IP. This is because for an IP address to be valid, the network or host part should not be all 0s or all 1s.
3. 222.222.255.222 (Binary: 11011110 . 11011110 . 11111111 . 11011110)
This is a class C address. (from 192.0.0.0 to 223.255.255.255)
NetID: 222.222.255
HostID: 222
This is a valid IP.
4. 190.7.2.0 (Binary: 10111110 . 00000111 . 00000010 . 00000000)
This is a class B address. (first byte 190 is in 192 - 223)
NetID: 190.7
HostID: 2.0
This is a valid IP.
5. 127.1.1.1 (Binary: 01111111 . 00000001 . 00000001 . 00000001)
This is a class A address. (first byte 127 is in 1- 127)
The IP range 127.x.x.x is reserved for loopback addresses
NetID: 127
HostID: 1.1.1
This is a valid IP.
6. 255.255.255.255 (Binary: 11111111 . 11111111 . 11111111 . 11111111)
This is a class E address. (from 240.0.0.0 to 255.255.255.255 )
NetID: Not applicable to class E addresses
HostID: Not applicable to class E addresses
This is a NOT a valid IP. This is because of the presence of all 1s in the network and host part of the IP. This address represents broadcast to all networks.
7. 198.121.254.255 (Binary: 11000110 . 01111001 . 11111110 . 11111111)
This is a class C address. (first byte 198 is in 192 - 223)
NetID: 198.121.254
HostID: 255
This is NOT a valid IP. This is because the host part of the IP consists of only 1s.
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