Address (Host or Network) Netmask (i.e. 24) Netmask for sub/supernet (optional)
/ move to:
 



Address:   172.16.0.0            10101100.00010000 .00000000.00000000
Netmask: 255.255.0.0 = 16 11111111.11111111 .00000000.00000000
Wildcard: 0.0.255.255 00000000.00000000 .11111111.11111111
=> Network: 172.16.0.0/16 10101100.00010000 .00000000.00000000 (Class B)
Broadcast: 172.16.255.255 10101100.00010000 .11111111.11111111
HostMin: 172.16.0.1 10101100.00010000 .00000000.00000001
HostMax: 172.16.255.254 10101100.00010000 .11111111.11111110
Hosts/Net: 65534 (Private Internet)

Subnets Netmask: 255.255.240.0 = 20 11111111.11111111.1111 0000.00000000
Wildcard: 0.0.15.255 00000000.00000000.0000 1111.11111111
Network: 172.16.0.0/20 10101100.00010000.0000 0000.00000000 (Class B)
Broadcast: 172.16.15.255 10101100.00010000.0000 1111.11111111
HostMin: 172.16.0.1 10101100.00010000.0000 0000.00000001
HostMax: 172.16.15.254 10101100.00010000.0000 1111.11111110
Hosts/Net: 4094 (Private Internet)

Network: 172.16.16.0/20 10101100.00010000.0001 0000.00000000 (Class B)
Broadcast: 172.16.31.255 10101100.00010000.0001 1111.11111111
HostMin: 172.16.16.1 10101100.00010000.0001 0000.00000001
HostMax: 172.16.31.254 10101100.00010000.0001 1111.11111110
Hosts/Net: 4094 (Private Internet)

Network: 172.16.32.0/20 10101100.00010000.0010 0000.00000000 (Class B)
Broadcast: 172.16.47.255 10101100.00010000.0010 1111.11111111
HostMin: 172.16.32.1 10101100.00010000.0010 0000.00000001
HostMax: 172.16.47.254 10101100.00010000.0010 1111.11111110
Hosts/Net: 4094 (Private Internet)

Network: 172.16.48.0/20 10101100.00010000.0011 0000.00000000 (Class B)
Broadcast: 172.16.63.255 10101100.00010000.0011 1111.11111111
HostMin: 172.16.48.1 10101100.00010000.0011 0000.00000001
HostMax: 172.16.63.254 10101100.00010000.0011 1111.11111110
Hosts/Net: 4094 (Private Internet)

Network: 172.16.64.0/20 10101100.00010000.0100 0000.00000000 (Class B)
Broadcast: 172.16.79.255 10101100.00010000.0100 1111.11111111
HostMin: 172.16.64.1 10101100.00010000.0100 0000.00000001
HostMax: 172.16.79.254 10101100.00010000.0100 1111.11111110
Hosts/Net: 4094 (Private Internet)

Network: 172.16.80.0/20 10101100.00010000.0101 0000.00000000 (Class B)
Broadcast: 172.16.95.255 10101100.00010000.0101 1111.11111111
HostMin: 172.16.80.1 10101100.00010000.0101 0000.00000001
HostMax: 172.16.95.254 10101100.00010000.0101 1111.11111110
Hosts/Net: 4094 (Private Internet)

Network: 172.16.96.0/20 10101100.00010000.0110 0000.00000000 (Class B)
Broadcast: 172.16.111.255 10101100.00010000.0110 1111.11111111
HostMin: 172.16.96.1 10101100.00010000.0110 0000.00000001
HostMax: 172.16.111.254 10101100.00010000.0110 1111.11111110
Hosts/Net: 4094 (Private Internet)

Network: 172.16.112.0/20 10101100.00010000.0111 0000.00000000 (Class B)
Broadcast: 172.16.127.255 10101100.00010000.0111 1111.11111111
HostMin: 172.16.112.1 10101100.00010000.0111 0000.00000001
HostMax: 172.16.127.254 10101100.00010000.0111 1111.11111110
Hosts/Net: 4094 (Private Internet)

Network: 172.16.128.0/20 10101100.00010000.1000 0000.00000000 (Class B)
Broadcast: 172.16.143.255 10101100.00010000.1000 1111.11111111
HostMin: 172.16.128.1 10101100.00010000.1000 0000.00000001
HostMax: 172.16.143.254 10101100.00010000.1000 1111.11111110
Hosts/Net: 4094 (Private Internet)

Network: 172.16.144.0/20 10101100.00010000.1001 0000.00000000 (Class B)
Broadcast: 172.16.159.255 10101100.00010000.1001 1111.11111111
HostMin: 172.16.144.1 10101100.00010000.1001 0000.00000001
HostMax: 172.16.159.254 10101100.00010000.1001 1111.11111110
Hosts/Net: 4094 (Private Internet)

Network: 172.16.160.0/20 10101100.00010000.1010 0000.00000000 (Class B)
Broadcast: 172.16.175.255 10101100.00010000.1010 1111.11111111
HostMin: 172.16.160.1 10101100.00010000.1010 0000.00000001
HostMax: 172.16.175.254 10101100.00010000.1010 1111.11111110
Hosts/Net: 4094 (Private Internet)

Network: 172.16.176.0/20 10101100.00010000.1011 0000.00000000 (Class B)
Broadcast: 172.16.191.255 10101100.00010000.1011 1111.11111111
HostMin: 172.16.176.1 10101100.00010000.1011 0000.00000001
HostMax: 172.16.191.254 10101100.00010000.1011 1111.11111110
Hosts/Net: 4094 (Private Internet)

Network: 172.16.192.0/20 10101100.00010000.1100 0000.00000000 (Class B)
Broadcast: 172.16.207.255 10101100.00010000.1100 1111.11111111
HostMin: 172.16.192.1 10101100.00010000.1100 0000.00000001
HostMax: 172.16.207.254 10101100.00010000.1100 1111.11111110
Hosts/Net: 4094 (Private Internet)

Network: 172.16.208.0/20 10101100.00010000.1101 0000.00000000 (Class B)
Broadcast: 172.16.223.255 10101100.00010000.1101 1111.11111111
HostMin: 172.16.208.1 10101100.00010000.1101 0000.00000001
HostMax: 172.16.223.254 10101100.00010000.1101 1111.11111110
Hosts/Net: 4094 (Private Internet)

Network: 172.16.224.0/20 10101100.00010000.1110 0000.00000000 (Class B)
Broadcast: 172.16.239.255 10101100.00010000.1110 1111.11111111
HostMin: 172.16.224.1 10101100.00010000.1110 0000.00000001
HostMax: 172.16.239.254 10101100.00010000.1110 1111.11111110
Hosts/Net: 4094 (Private Internet)

Network: 172.16.240.0/20 10101100.00010000.1111 0000.00000000 (Class B)
Broadcast: 172.16.255.255 10101100.00010000.1111 1111.11111111
HostMin: 172.16.240.1 10101100.00010000.1111 0000.00000001
HostMax: 172.16.255.254 10101100.00010000.1111 1111.11111110
Hosts/Net: 4094 (Private Internet)

Subnets: 16
Hosts: 65504

Thanks to http://www.netzwerkinfo.de/daemons/ for this ip calculator icon :-)
Version 0.35.2 2005/07/07

Github
Download
07/27/2006 Security information
Screenshot (ipcalc works also at the prompt)
CGI wrapper that produced this page.
Archive
Have a look in the archives for the new version 0.41, with the capability to deaggregate network ranges
How to run this under windows
Debian users can apt-get install ipcalc
2000-2021 Krischan Jodies ipcalc202105 (a) jodies.de

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