Your IP address:
Provider:
...

For example: 3.17.134.216

/
Input
Address: 204.31.0.0
Netmask: 255.255.240.0 = 20
Inversion mask: 0.0.15.255
Binary: 11001100.00011111.00000000.00000000
Reserved: No
Result
Network: 204.31.0.0/20 (Class C)
First IP: 204.31.0.1
Last IP: 204.31.15.254
Broadcast: 204.31.15.255
Network range: 204.31.0.0 - 204.31.15.255
List of all IP addresses: 204_31_0_0-20.txt
Number of hosts: 4094
Number of IP addresses: 4096