Your IP address:
Provider:
...

For example: 216.73.216.57

/
Input
Address: 209.234.240.0
Netmask: 255.255.248.0 = 21
Inversion mask: 0.0.7.255
Binary: 11010001.11101010.11110000.00000000
Reserved: No
Result
Network: 209.234.240.0/21 (Class C)
First IP: 209.234.240.1
Last IP: 209.234.247.254
Broadcast: 209.234.247.255
Network range: 209.234.240.0 - 209.234.247.255
List of all IP addresses: 209_234_240_0-21.txt
Number of hosts: 2046
Number of IP addresses: 2048