Online IP calculator (requires javascript)
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IP address (classic): 192.168.0.11/255.255.0.0
IP address (cisco): 192.168.0.11/16
IP value (binary): 11000000.10101000.00000000.00001011
Netmask (binary): 11111111.11111111.00000000.00000000
Network: 192.168.0.0/16
Network Class: B
Total avail. IP: 65536
Network address: 192.168.0.0
Broadcast address: 192.168.255.255

Other info: reserved IP classes

127.0.0.0/8 Loopback
the entire class A beginning with 127.
10.0.0.0/8 Private
the entire class A beginning with 10.
172.16.0.0/12 Private
16 contiguos Class B, from 172.16.0.0/16 through 172.31.0.0/16
192.168.0.0/16 Private
256 contiguos Class C, from 192.168.0.0/24 through 192.168.255.0/24