What are these Google IPs hammering on my DNS server?

Sun Dec 3 19:16:57 UTC 2023

172.253.X.X are Google DNS : https://www.gstatic.com/ipranges/publicdns.json

172.71.X.X are Cloudflare : https://www.cloudflare.com/ips-v4/#

On Sun, Dec 3, 2023 at 1:49 PM John Levine <johnl at iecc.com> wrote:

> At contacts.abuse.net, I have a little stunt DNS server that provides
> domain contact info, e.g.:
>
> $ host -t txt comcast.net.contacts.abuse.net
> comcast.net.contacts.abuse.net descriptive text "abuse at comcast.net"
>
> $ host -t hinfo comcast.net.contacts.abuse.net
> comcast.net.contacts.abuse.net host information "lookup" "comcast.net"
>
> Every once in a while someone decides to look up every domain in the
> world and DoS'es it until I update my packet filters. This week it's
> been this set of IPs that belong to Google. I don't think they're
> 8.8.8.8. Any idea what they are? Random Google Cloud customers? A
> secret DNS mapping project?
>
>  172.253.1.133
>  172.253.206.36
>  172.253.1.130
>  172.253.206.37
>  172.253.13.196
>  172.253.255.36
>  172.253.13.197
>  172.253.1.131
>  172.253.255.35
>  172.253.255.37
>  172.253.1.132
>  172.253.13.193
>  172.253.1.129
>  172.253.255.33
>  172.253.206.35
>  172.253.255.34
>  172.253.206.33
>  172.253.206.34
>  172.253.13.194
>  172.253.13.195
>  172.71.125.63
>  172.71.117.60
>  172.71.133.51
>
> R's,
> John
>
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