Your IP address:
Provider:
...

For example: 3.145.15.205

/
Input
Address: 66.151.80.0
Netmask: 255.255.240.0 = 20
Inversion mask: 0.0.15.255
Binary: 01000010.10010111.01010000.00000000
Reserved: No
Result
Network: 66.151.80.0/20 (Class A)
First IP: 66.151.80.1
Last IP: 66.151.95.254
Broadcast: 66.151.95.255
Network range: 66.151.80.0 - 66.151.95.255
List of all IP addresses: 66_151_80_0-20.txt
Number of hosts: 4094
Number of IP addresses: 4096