0.0.0.0/8 - "This network."
0.0.0.0/8 was allocated on September of 1981.

Addresses in 0.0.0.0/8 may be used as the source address of an IP datagram that transits two devices.

Addresses in 0.0.0.0/8 may NOT be used as the destination address of an IP datagram that transits two devices.

Addresses in 0.0.0.0/8 are NOT forwardable.
A router may NOT forward an IP datagram to Addresses in 0.0.0.0/8 between external interfaces

Addresses in 0.0.0.0/8 are NOT globally reachable
An IP datagram may NOT be forwarded to Addresses in 0.0.0.0/8 beyond a specified administative domain.

The RFC that created 0.0.0.0/8 requires all compliant IP implementations to behave in a special way when processing packets either to or from addresses contained by 0.0.0.0/8



[ RFC791, ^ ] , Section 3.2

  
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