Getting all IP adresses for a domain name

Leroy Tennison leroy at
Wed Jan 29 19:12:31 UTC 2020

I ran into a situation here the IP (v4) address returned for a domain was different from two systems.  It turned out that two DNS servers served the domain and were replying with different IP addresses (discovered by doing whois on the domain followed by dig @<name server> for each name server).  This led me to wonder "How would I get all IP addresses if DNS round robin was being used?"  I work with external organizations so I can't count on the DNS server being ISC's.  I'm not concerned about multiple servers behind a single IP address (Anycast for instance) because I consider issues related to that to be the destination organization's problem, I'm only concerned with what possible IP addresses could be returned in response to a query.

Thanks in advance for any information.


Leroy Tennison
Network Information/Cyber Security Specialist
E: leroy at


2220 Bush Dr
McKinney, Texas

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