Your IP address:
Provider:
...

For example: 35.175.212.5

/
Input
Address: 65.8.12.0
Netmask: 255.255.254.0 = 23
Inversion mask: 0.0.1.255
Binary: 01000001.00001000.00001100.00000000
Reserved: No
Result
Network: 65.8.12.0/23 (Class A)
First IP: 65.8.12.1
Last IP: 65.8.13.254
Broadcast: 65.8.13.255
Network range: 65.8.12.0 - 65.8.13.255
List of all IP addresses: 65_8_12_0-23.txt
Number of hosts: 510
Number of IP addresses: 512