Network intelligence
ASN & IP Lookup
Map a public IP or domain to its autonomous system, BGP prefix, registry, and network owner context.
- Resolve domain to a public IP when needed
- Lookup ASN and BGP prefix
- Show registry and country context
- Use network owner data during blacklist triage
Inspect a live record
Results are generated on demand so you can verify the current public configuration.
About This Tool
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.
Frequently Asked Questions
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.