Your IP address:
Provider:
...

For example: 3.138.175.180

/
Input
Address: 15.181.120.0
Netmask: 255.255.248.0 = 21
Inversion mask: 0.0.7.255
Binary: 00001111.10110101.01111000.00000000
Reserved: No
Result
Network: 15.181.120.0/21 (Class A)
First IP: 15.181.120.1
Last IP: 15.181.127.254
Broadcast: 15.181.127.255
Network range: 15.181.120.0 - 15.181.127.255
List of all IP addresses: 15_181_120_0-21.txt
Number of hosts: 2046
Number of IP addresses: 2048