Your IP address:
Provider:
...

For example: 3.144.102.239

/
Input
Address: 216.99.128.0
Netmask: 255.255.248.0 = 21
Inversion mask: 0.0.7.255
Binary: 11011000.01100011.10000000.00000000
Reserved: No
Result
Network: 216.99.128.0/21 (Class C)
First IP: 216.99.128.1
Last IP: 216.99.135.254
Broadcast: 216.99.135.255
Network range: 216.99.128.0 - 216.99.135.255
List of all IP addresses: 216_99_128_0-21.txt
Number of hosts: 2046
Number of IP addresses: 2048