Your IP address:
Provider:
...

For example: 18.218.234.83

/
Input
Address: 77.123.64.0
Netmask: 255.255.240.0 = 20
Inversion mask: 0.0.15.255
Binary: 01001101.01111011.01000000.00000000
Reserved: No
Result
Network: 77.123.64.0/20 (Class A)
First IP: 77.123.64.1
Last IP: 77.123.79.254
Broadcast: 77.123.79.255
Network range: 77.123.64.0 - 77.123.79.255
List of all IP addresses: 77_123_64_0-20.txt
Number of hosts: 4094
Number of IP addresses: 4096