IPXpert · Network engineering
IP to ASN: separate route origin from registered ownership
A single IP address can lead to several different facts: its covering BGP prefix, an observed origin ASN, registry attribution and inferred network relationships. These facts answer different questions and should not be merged into one ownership claim.
Technical review: · فارسی
Use the lookup that actually exists
- Enter an IP address or CIDR prefix in the Looking Glass. The standalone interface accepts IP/CIDR; it is not a general ASN-number search engine.
- Inspect the covering prefix and every origin ASN returned by the collectors. No observations means routing origin is unavailable from that response, not that the address has no owner.
- Use Prefix Explorer to inspect Iranian prefix attribution and its stated source. An enclosing LIR allocation is less specific than a direct assignment.
- If ownership is material to the investigation, corroborate registry records and operator information rather than relying on the origin label alone.
What a relationship does not prove
An AS adjacency in an observed path does not by itself establish a paid transit agreement or peering policy. An observed origin can differ from the organization registered for the covering address space. More-specific routes and multiple origins must be considered before reaching a conclusion.
Registry country information is not precise physical geolocation, a user’s location or an assurance about the jurisdiction of hosted data. This platform does not claim a general-purpose geolocation database.
Interpret uncertainty explicitly
Record the lookup time, prefix and source with the result. A lookup timeout, unknown organization or missing path is a data limitation. Do not fill those states with a sample ASN. For a full ASN inventory or historical route changes, consult the appropriate RIPEstat datasets; those are not capabilities promised by this IP/CIDR form.