[dns-operations] Unpublished IP addresses for Google Public DNS

[Babak Farrokhi]

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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