Your IP address:
Provider:
...

For example: 18.117.72.224

/
Input
Address: 209.240.28.0
Netmask: 255.255.254.0 = 23
Inversion mask: 0.0.1.255
Binary: 11010001.11110000.00011100.00000000
Reserved: No
Result
Network: 209.240.28.0/23 (Class C)
First IP: 209.240.28.1
Last IP: 209.240.29.254
Broadcast: 209.240.29.255
Network range: 209.240.28.0 - 209.240.29.255
List of all IP addresses: 209_240_28_0-23.txt
Number of hosts: 510
Number of IP addresses: 512