172.16.0.1 is a Special Purpose IP Address.

172.16.0.0/12 - Private-Use
172.16.0.0/12 was allocated on February of 1996.

Addresses in 172.16.0.0/12 may be used as the source address of an IP datagram that transits two devices.

Addresses in 172.16.0.0/12 may be used as the destination address of an IP datagram that transits two devices.

Addresses in 172.16.0.0/12 are forwardable.
A router may forward an IP datagram to Addresses in 172.16.0.0/12 between external interfaces

Addresses in 172.16.0.0/12 are NOT globally reachable
An IP datagram may NOT be forwarded to Addresses in 172.16.0.0/12 beyond a specified administative domain.

The 172.16.0.0/12 special purpose address block is set aside for use in private networks. Addresses within 172.16.0.0/12 do not legimately appear on the public Internet. Addresses within 172.16.0.0/12 may be used without any coordination with IANA or an Internet registry.

[ RFC1918, ^ ]

  
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