Your IP address:
Provider:
...

For example: 216.73.217.125

/
Input
Address: 66.7.10.0
Netmask: 255.255.254.0 = 23
Inversion mask: 0.0.1.255
Binary: 01000010.00000111.00001010.00000000
Reserved: No
Result
Network: 66.7.10.0/23 (Class A)
First IP: 66.7.10.1
Last IP: 66.7.11.254
Broadcast: 66.7.11.255
Network range: 66.7.10.0 - 66.7.11.255
List of all IP addresses: 66_7_10_0-23.txt
Number of hosts: 510
Number of IP addresses: 512