Your IP address:
Provider:
...

For example: 18.220.154.41

/
Input
Address: 18.204.0.0
Netmask: 255.252.0.0 = 14
Inversion mask: 0.3.255.255
Binary: 00010010.11001100.00000000.00000000
Reserved: No
Result
Network: 18.204.0.0/14 (Class A)
First IP: 18.204.0.1
Last IP: 18.207.255.254
Broadcast: 18.207.255.255
Network range: 18.204.0.0 - 18.207.255.255
Number of hosts: 262142
Number of IP addresses: 262144