X-RAY // DNS // ASN

NETWORK AND HOSTING
CHECK.

Identify the autonomous system (ASN), the organisation and the BGP prefix that announce the IP of a domain, and whether it sits behind a CDN or cloud.

Runs only this check. For all 33 checks at once, use the full Domain X-Ray. Public lookups only; nothing is stored on the server.

ASN

Network and hosting

WAITING

Enter a domain above to run this check.

01 // WHAT THE CHECK VERIFIES

What the check verifies

Identifies the autonomous system (ASN), the organisation and the prefix that announce the domain address, using the Team Cymru IP-to-ASN database.

02 // WHY IT MATTERS

Why it matters

Shows who hosts or protects the site, such as a CDN. The country is where the prefix is registered, not the physical location of the server.

03 // HOW TO READ THE RESULT

What each result means

INFO: Shows the IP, ASN, prefix, registration country and RIR, and says when the IP belongs to a CDN or cloud: then it is the edge, not the origin server.
NOT TESTED: The domain has no public IPv4 address to look up.

ERROR and TIMEOUT mean the query did not finish (the source was down or slow), not a problem with the domain: run the check again.

04 // HOW TO FIX

How to fix

The same data in the terminal, from the Team Cymru IP-to-ASN database:

whois -h whois.cymru.com " -v 203.0.113.10"

Would rather have someone else do it? Bit Happens can fix this →

05 // CONTINUE

More checks in DNS and name servers

IP context in What Is My IP →

Full Domain X-Ray: all 33 DNS, email, HTTPS, certificate and reputation checks at once →