0.0.0.0 is a Special Purpose IP Address.

0.0.0.0/32 - "This host on this network."
0.0.0.0/32 was allocated on September of 1981.

0.0.0.0/32 may be used as the source address of an IP datagram that transits two devices.

0.0.0.0/32 may NOT be used as the destination address of an IP datagram that transits two devices.

0.0.0.0/32 is NOT forwardable.
A router may NOT forward an IP datagram to 0.0.0.0/32 between external interfaces

0.0.0.0/32 is NOT globally reachable
An IP datagram may NOT be forwarded to 0.0.0.0/32 beyond a specified administative domain.

The RFC that created 0.0.0.0/32 requires all compliant IP implementations to behave in a special way when processing packets either to or from addresses contained by 0.0.0.0/32



0.0.0.0 MUST NOT be sent, except as a source address as part of an initialization procedure by which the host learns its own IP address.

[ RFC1122, ^ ] Section 3.2.1.3

  
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