8.8.8.8 returns NXDOMAIN randomly for all our subdomains

[Lukass Lappuķe]

Hi all!

Our customers make quite a few domain checks towards Google public DNS with the following domains <userid>.sip.teltel.io , but they often fail. To others, like Cloudflare it is always successful.

When running nslookup in a loop towards 8.8.8.8, 80% of the time Google fails to resolve. To 1.1.1.1 it is always successful. See below a failed example:

Request:

while :
do
    nslookup 7157599388.sip.teltel.io 8.8.8.8
done

Response:

Server: 8.8.8.8

Address: 8.8.8.8#53
** server can't find 7157599388.sip.teltel.io: NXDOMAIN

Does anyone have an idea why?

Thank you in advance!

[Roland Kapidani]

I've the same problem with my domains, have you solved?