Your IP address:
Provider:
...

For example: 54.166.223.204

/
Input
Address: 72.13.78.0
Netmask: 255.255.254.0 = 23
Inversion mask: 0.0.1.255
Binary: 01001000.00001101.01001110.00000000
Reserved: No
Result
Network: 72.13.78.0/23 (Class A)
First IP: 72.13.78.1
Last IP: 72.13.79.254
Broadcast: 72.13.79.255
Network range: 72.13.78.0 - 72.13.79.255
List of all IP addresses: 72_13_78_0-23.txt
Number of hosts: 510
Number of IP addresses: 512