Your IP address:
Provider:
...

For example: 216.73.216.57

/
Input
Address: 172.81.139.0
Netmask: 255.255.255.0 = 24
Inversion mask: 0.0.0.255
Binary: 10101100.01010001.10001011.00000000
Reserved: No
Result
Network: 172.81.139.0/24 (Class B)
First IP: 172.81.139.1
Last IP: 172.81.139.254
Broadcast: 172.81.139.255
Network range: 172.81.139.0 - 172.81.139.255
List of all IP addresses: 172_81_139_0-24.txt
Number of hosts: 254
Number of IP addresses: 256