[dns-operations] Unpublished IP addresses for Google Public DNS

[Roy Arends]

dig TXT locations.publicdns.goog.

This will give you all addresses of Google’s public dns unicast backend.

Warmly

Roy

> On 19 Oct 2017, at 16:44, Babak Farrokhi <babak at farrokhi.net> wrote:
> 
> Hi,
> 
> I have seen several addresses from 172.217.42.x as source address from Google resolvers. Here is a list of IPs I’ve seen recently:
> 
> 172.217.42.3
> 172.217.42.4
> 172.217.42.5
> 172.217.42.6
> 172.217.42.7
> 172.217.42.8
> 172.217.42.9
> 172.217.42.10
> 172.217.42.11
> 172.217.42.14
> 
> 
> Kind Regards,
> 
> -- 
> Babak Farrokhi
> 
> 
> On 12 Oct 2017, at 3:51, Rajesh Maskara wrote:
> 
> Are following two IP addresses used by Google Public DNS for DNS resolution?
> 
>                 172.217.42.2
> 
>                 172.217.42.4
> 
>  
> 
> These addresses are NOT included in published ranges:
> 
> C:\>nslookup -type=TXT locations.publicdns.goog. | findstr "172.217."
> 
> Non-authoritative answer:
> 
>         "172.217.32.0/26 lhr "
> 
>         "172.217.32.64/26 lhr "
> 
>         "172.217.32.128/26 sin "
> 
>         "172.217.33.0/26 syd "
> 
>         "172.217.33.64/26 syd "
> 
>         "172.217.33.128/26 fra "
> 
>         "172.217.33.192/26 fra "
> 
>         "172.217.34.0/26 fra "
> 
>         "172.217.34.64/26 bom "
> 
>         "172.217.34.192/26 bom "
> 
>         "172.217.35.0/24 gru "
> 
>         "172.217.36.0/24 atl "
> 
>         "172.217.37.0/24 gru "
> 
>  
> 
> This is resulting in Traffic Managers like DYN etc to map the end-users incorrectly to CA, USA.
> 
>  
> 
> Thanks,
> Rajesh Maskara
> 
> Microsoft
> 
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