Your IP address:
Provider:
...

For example: 3.141.29.145

/
Input
Address: 66.179.0.0
Netmask: 255.255.248.0 = 21
Inversion mask: 0.0.7.255
Binary: 01000010.10110011.00000000.00000000
Reserved: No
Result
Network: 66.179.0.0/21 (Class A)
First IP: 66.179.0.1
Last IP: 66.179.7.254
Broadcast: 66.179.7.255
Network range: 66.179.0.0 - 66.179.7.255
List of all IP addresses: 66_179_0_0-21.txt
Number of hosts: 2046
Number of IP addresses: 2048