Hosting ASN Checker
Which network (Autonomous System) hosts this domain.
This is one independent signal used by the Domain Security Score, and can also be run on its own for any domain.
Based on: Team Cymru — IP to ASN Mapping
About this validation
Which network (Autonomous System) hosts a domain.
- Vendor documentation:
- Rules reviewed:
- Sep 6, 2026
SEOTechTests methodology: Data source: a live DNS-based Team Cymru IP-to-ASN lookup performed by SEOTechTests against the domain's resolved IP. This is descriptive infrastructure information, not itself scored as pass/fail.
Standards and vendor-documented behavior can change. This reflects the source as last reviewed above, not a permanent guarantee.
FAQ
What does the Hosting ASN check show?
Which Autonomous System (network operator/hosting provider) currently hosts the domain's resolved IP address -- descriptive infrastructure information, shown for context.
Why does SEOTechTests use Team Cymru's IP-to-ASN service?
It's a long-established, free, DNS-based lookup specifically designed for mapping an IP to its announcing network, widely used across the network operations and security community.
Does the hosting network by itself indicate risk?
Not on its own -- legitimate sites are hosted across every kind of network, from major clouds to small regional providers. It's contextual information, not a scored security finding.
How is this different from IP Reputation?
This check identifies which network hosts the domain; the separate IP Reputation check looks at community abuse reports specifically against that IP address.