ASN & IP Lookup
Map a public IP or domain to its autonomous system, BGP prefix, registry, and network owner context.
Workflow
Run check
Inspect a live record
Results are generated on demand so you can verify the current public configuration.
What does ASN lookup show?
ASN lookup maps an IP address to the BGP network announcing it, including prefix, registry,
country, and network owner name when available.
Why use it?
During blacklist incidents, ASN and prefix context helps separate domain-level problems from
provider, hosting, or neighboring-network reputation issues.
Next step:
Run a blacklist scan
after identifying the network behind the IP.
What is an ASN? +
An Autonomous System Number identifies the network that announces IP prefixes to the internet through BGP.
Why does ASN context matter for reputation? +
Listings and deliverability problems often cluster around hosting providers, prefixes, or networks. ASN context helps responders understand ownership and escalation paths.
Can I enter a domain? +
Yes. HostRepute resolves the domain to a public IP first, then looks up the ASN and BGP prefix for that address.