27 lines
1.1 KiB
Markdown
27 lines
1.1 KiB
Markdown
# 0.0.0.0
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## Who is this IP?
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**Short answer:** `0.0.0.0` belongs to no company or ordinary network operator. IANA reserves both the exact `0.0.0.0/32` address and its `0.0.0.0/8` parent as special-purpose protocol space.
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| Axis | Finding |
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|---|---|
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| Exact registry entry | `0.0.0.0/32` |
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| IANA name | “This host on this network” |
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| Parent block | `0.0.0.0/8` — “This network” |
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| Organizational holder | None; reserved by the IP protocol |
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| Destination allowed | No |
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| Forwardable | No |
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| Globally reachable | No |
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| Normal route origin | None expected |
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## Meaning
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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.
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## Sources
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- [IANA IPv4 Special-Purpose Address Space](https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml), checked 2026-07-20
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- [RFC 1122, section 3.2.1.3](https://www.rfc-editor.org/rfc/rfc1122.html#section-3.2.1.3)
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- [RFC 791](https://www.rfc-editor.org/rfc/rfc791.html)
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