Your IP address:
Provider:
...

For example: 18.227.111.192

/
Input
Address: 15.181.40.0
Netmask: 255.255.248.0 = 21
Inversion mask: 0.0.7.255
Binary: 00001111.10110101.00101000.00000000
Reserved: No
Result
Network: 15.181.40.0/21 (Class A)
First IP: 15.181.40.1
Last IP: 15.181.47.254
Broadcast: 15.181.47.255
Network range: 15.181.40.0 - 15.181.47.255
List of all IP addresses: 15_181_40_0-21.txt
Number of hosts: 2046
Number of IP addresses: 2048