Your IP address:
Provider:
...

For example: 18.220.1.239

/
Input
Address: 57.204.0.0
Netmask: 255.255.0.0 = 16
Inversion mask: 0.0.255.255
Binary: 00111001.11001100.00000000.00000000
Reserved: No
Result
Network: 57.204.0.0/16 (Class A)
First IP: 57.204.0.1
Last IP: 57.204.255.254
Broadcast: 57.204.255.255
Network range: 57.204.0.0 - 57.204.255.255
List of all IP addresses: 57_204_0_0-16.txt
Number of hosts: 65534
Number of IP addresses: 65536