Your IP address:
Provider:
...

For example: 3.144.237.3

/
Input
Address: 149.48.128.0
Netmask: 255.255.248.0 = 21
Inversion mask: 0.0.7.255
Binary: 10010101.00110000.10000000.00000000
Reserved: No
Result
Network: 149.48.128.0/21 (Class B)
First IP: 149.48.128.1
Last IP: 149.48.135.254
Broadcast: 149.48.135.255
Network range: 149.48.128.0 - 149.48.135.255
List of all IP addresses: 149_48_128_0-21.txt
Number of hosts: 2046
Number of IP addresses: 2048