1.1 KiB
1.1 KiB
0.0.0.0
Answer
0.0.0.0 is not an ordinary public address owned by a company. IANA records both the exact 0.0.0.0/32 address and its 0.0.0.0/8 parent as special-purpose protocol space.
| Axis | Finding |
|---|---|
| Exact registry entry | 0.0.0.0/32 |
| IANA name | “This host on this network” |
| Parent block | 0.0.0.0/8 — “This network” |
| Organizational holder | None; reserved by the IP protocol |
| Destination allowed | No |
| Forwardable | No |
| Globally reachable | No |
| Normal route origin | None expected |
Meaning
The exact all-zero address is used as an unspecified source address in limited host-initialization contexts. It must not be treated as a normal globally reachable destination or as an address assigned to an ISP, cloud, or person.
Sources
- IANA IPv4 Special-Purpose Address Space, checked 2026-07-20
- RFC 1122, section 3.2.1.3
- RFC 791