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How can I find the origins of conflicting DNS records?
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You'll want the SOA (Start of Authority) record for a given domain name, and this is how you accomplish it using the universally available nslookup command line tool: command line> nslookup > set querytype=soa > stackoverflow.com Server: 217.30. 180.230 Address: 217.30.
Authoritative DNS is the system that takes an address, like google.com, and provides an answer about the resources in that zone. The typical transaction looks something like this: User types an address into a web browser, or an application calls out to a given name of a resource on the Internet.
An authoritative name server is a name server that gives answers in response to questions asked about names in a zone. An authoritative-only name server returns answers only to queries about domain names that have been specifically configured by the administrator.
You'll want the SOA (Start of Authority) record for a given domain name, and this is how you accomplish it using the universally available nslookup command line tool:
command line> nslookup > set querytype=soa > stackoverflow.com Server: 217.30.180.230 Address: 217.30.180.230#53 Non-authoritative answer: stackoverflow.com origin = ns51.domaincontrol.com # ("primary name server" on Windows) mail addr = dns.jomax.net # ("responsible mail addr" on Windows) serial = 2008041300 refresh = 28800 retry = 7200 expire = 604800 minimum = 86400 Authoritative answers can be found from: stackoverflow.com nameserver = ns52.domaincontrol.com. stackoverflow.com nameserver = ns51.domaincontrol.com. The origin (or primary name server on Windows) line tells you that ns51.domaincontrol is the main name server for stackoverflow.com.
At the end of output all authoritative servers, including backup servers for the given domain, are listed.
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