Services-Whois.md
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@@ -30,7 +30,7 @@ There is also a DNS-based interface to query AS information from the registry. T
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The Python code for generating the zone from the registry is available on the monotone repository.
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-The idea comes from the guys at cymru.com, who provide this service for the Internet (e.g. `AS1.asn.cymru.com`)
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+The idea comes from the guys at cymru.com, who provide this service for the Internet (e.g. `AS1.asn.cymru.com`), see https://www.team-cymru.org/Services/ip-to-asn.html#dns
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## Address space
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