Your IP address:
Provider:
...

For example: 216.73.217.125

/
Input
Address: 66.7.8.128
Netmask: 255.255.255.128 = 25
Inversion mask: 0.0.0.127
Binary: 01000010.00000111.00001000.10000000
Reserved: No
Result
Network: 66.7.8.128/25 (Class A)
First IP: 66.7.8.129
Last IP: 66.7.8.254
Broadcast: 66.7.8.255
Network range: 66.7.8.128 - 66.7.8.255
List of all IP addresses: 66_7_8_128-25.txt
Number of hosts: 126
Number of IP addresses: 128