MyIPScan
BGP context

ASN Lookup

Look up an autonomous system number or public IP address to see network ownership and announced prefix context.

ASN data describes the network announcing routes. It can indicate an ISP, VPN provider, mobile carrier, cloud host, or enterprise network, but it does not identify a person.

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Lookup ASN or IP

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ASN Lookup: answer first

Look up ASN and network information for public IP or ASN inputs. Use the result as an observable public-signal check with stated limitations, not as an absolute guarantee.

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Results

ASN and routing context

Enter an ASN or public IP address to look up network ownership and BGP context.

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Providers used

  • Provider details appear after a lookup.

Limitations

  • BGP and ASN data can change.
  • Some IPs map to CDN, cloud, hosting, VPN, or proxy infrastructure.
  • Prefix lists may be partial depending on the provider.
Want the full picture? Run the Privacy Exposure Report.

Combine IP, WebRTC, IPv6, DNS leak, fingerprint, user-agent, and related privacy signals in one report.

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Continue the privacy check

Domain Intelligence ReportCombine DNS, RDAP, ASN, PTR, CAA, DNSSEC, TXT, and provider hints. VPN Leak TestCompare route signals with expected VPN behavior. DNS Leak TestCheck resolver signals alongside ASN context. WebRTC Leak TestReview browser-exposed IP candidates. IP Geolocation LookupCheck approximate IP location and network fields.

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What this checks

Public DNS, HTTP, HTTPS, certificate, redirect, header, IP/ASN, or domain configuration signals.

Limits

What this cannot check

It cannot perform credentialed vulnerability testing, scan private hosts, bypass access controls, or certify complete security.

Read results

How to use the output

Treat results as review signals for this browser/session or public target. Re-test after one change, then use Safe Copy or notes that avoid raw identifiers.

Related tools

Continue with the closest checks

Public Exposure ReportFull browser-session report with Safe Copy, issues, fixes, and clear limits. VPN Leak TestCompare visible IP, DNS, WebRTC, IPv6, and browser signals. Website Exposure ScannerHTTPS, redirects, headers, DNS, IPv6, mixed content, and CDN/origin context. Domain Intelligence ReportDNS inventory, RDAP-safe context, IP/ASN, provider hints, and blacklist context. MethodologyReview how MyIPScan labels signals, limitations, and Safe Copy output.

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ASN Lookup: what this tool does

Checks autonomous system information for public IP or ASN inputs.

How to use

  1. Enter one public IP, ASN, domain, URL, or CIDR value accepted by the tool.
  2. Compare the network summary with the visible IP shown by Public Exposure Report.
  3. Use masked copy when sharing output with a provider or support desk.

What the result means

Treat IP, ASN, geolocation, RDAP, blacklist, latency, and subnet outputs as public network context. They are useful support signals, not identity or reputation guarantees.

Limitations

  • This tool reports observable signals only; it is not a guarantee or certification.
  • Uses existing ASN lookup route and public network data.
  • Results can change after VPN reconnects, DNS propagation, browser updates, cache changes, or provider configuration changes.

ASN Lookup — Common Questions

What is an ASN (Autonomous System Number)?

An ASN is a unique number assigned to a network operator — an ISP, hosting company, university, enterprise, or government agency — that manages its own routing on the internet. ASNs are used by the BGP routing protocol to exchange routing information between networks. IANA assigns ASN ranges to regional registries (ARIN, RIPE, APNIC, etc.) which in turn allocate them to organisations. Looking up an IP's ASN tells you which organisation owns and operates that address block.

How do I find the ASN for a VPN or hosting provider?

Enter any IP address from that provider and the tool will return its ASN, organisation name, and BGP prefixes. For example, Mullvad VPN uses AS39351, Cloudflare uses AS13335, Amazon AWS uses multiple ASNs including AS16509. This is useful for verifying that a VPN server's IP actually belongs to the VPN provider's network and not a third-party hosting company.

What is a BGP prefix?

A BGP prefix (also called an IP prefix or CIDR block) is the range of IP addresses announced by an ASN to the global routing table. For example, AS13335 (Cloudflare) announces 1.1.1.0/24, meaning it owns all IPs from 1.1.1.0 to 1.1.1.255. A single ASN may announce hundreds of prefixes. Seeing many small prefixes can indicate a fragmented IP space; a few large prefixes indicates consolidated ownership.

Can I look up an ASN number directly?

Yes — enter the ASN in the format "AS12345" or just "12345" to look up information about that autonomous system, including its registered organisation, country, and announced IP prefixes. You can also enter any public IP address to find which ASN owns it.

Next checks and references

IP and Network ToolsParent hub for this tool category.Domain Intelligence ReportLive DNS, RDAP, IP/ASN, PTR, CAA, DNSSEC, TXT, and provider hint report.IP Geolocation LookupApproximate IP location lookup.WHOIS / RDAP LookupPublic RDAP registry lookup.Reverse DNS LookupPTR lookup for public IP addresses.Relevant guideBackground reading for interpreting this result.MethodologyHow MyIPScan labels confidence, limits, and safe-copy outputs.