[dns-operations] Unpublished IP addresses for Google Public DNS

Rajesh Maskara rajmask at microsoft.com
Thu Oct 12 00:21:52 UTC 2017


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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