Your IP address:
Provider:
...

For example: 216.73.216.57

/
Input
Address: 157.239.12.0
Netmask: 255.255.254.0 = 23
Inversion mask: 0.0.1.255
Binary: 10011101.11101111.00001100.00000000
Reserved: No
Result
Network: 157.239.12.0/23 (Class B)
First IP: 157.239.12.1
Last IP: 157.239.13.254
Broadcast: 157.239.13.255
Network range: 157.239.12.0 - 157.239.13.255
List of all IP addresses: 157_239_12_0-23.txt
Number of hosts: 510
Number of IP addresses: 512