Your IP address:
Provider:
...

For example: 3.15.235.196

/
Input
Address: 172.103.40.0
Netmask: 255.255.248.0 = 21
Inversion mask: 0.0.7.255
Binary: 10101100.01100111.00101000.00000000
Reserved: No
Result
Network: 172.103.40.0/21 (Class B)
First IP: 172.103.40.1
Last IP: 172.103.47.254
Broadcast: 172.103.47.255
Network range: 172.103.40.0 - 172.103.47.255
List of all IP addresses: 172_103_40_0-21.txt
Number of hosts: 2046
Number of IP addresses: 2048