Your IP address:
Provider:
...

For example: 18.223.21.5

/
Input
Address: 204.8.28.0
Netmask: 255.255.254.0 = 23
Inversion mask: 0.0.1.255
Binary: 11001100.00001000.00011100.00000000
Reserved: No
Result
Network: 204.8.28.0/23 (Class C)
First IP: 204.8.28.1
Last IP: 204.8.29.254
Broadcast: 204.8.29.255
Network range: 204.8.28.0 - 204.8.29.255
List of all IP addresses: 204_8_28_0-23.txt
Number of hosts: 510
Number of IP addresses: 512