Getting all IP adresses for a domain name

Leroy Tennison leroy at
Wed Jan 29 21:23:11 UTC 2020

Thanks to both of you for your replies, +trace did show me the name servers for the domain and which answered, I would still need to query the other name servers but that's OK.  I wasn't aware that the standard DNS reply would show all A records for a domain - that's good to know, I wish I had a DNS round robin configuration to test against (we don't use it internally).  Fortunately I don't have to worry about different IP addresses based on location and my "context" doesn't involve CDNs so I can avoid that issue.
From: bind-users <bind-users-bounces at> on behalf of Matus UHLAR - fantomas <uhlar at>
Sent: Wednesday, January 29, 2020 1:34 PM
To: bind-users at <bind-users at>
Subject: [EXTERNAL] Re: Getting all IP adresses for a domain name

On 29.01.20 19:12, Leroy Tennison wrote:
>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.

in standard operation, DNS returns all A records associated with a domain

However, current CDNs tend to send different IPs for different clients,
often just the one that is tropologically closest to the client.

Unfortunately, such CDNs don't provide all possible addresses so I guess you
are unlucky here.

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


2220 Bush Dr
McKinney, Texas

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