Your IP address:
Provider:
...

For example: 18.191.43.140

/
Input
Address: 204.39.0.0
Netmask: 255.255.128.0 = 17
Inversion mask: 0.0.127.255
Binary: 11001100.00100111.00000000.00000000
Reserved: No
Result
Network: 204.39.0.0/17 (Class C)
First IP: 204.39.0.1
Last IP: 204.39.127.254
Broadcast: 204.39.127.255
Network range: 204.39.0.0 - 204.39.127.255
List of all IP addresses: 204_39_0_0-17.txt
Number of hosts: 32766
Number of IP addresses: 32768