_acme-challenge.libproxy1.cbs.mpg.de has no NS records.
NS records for this zone are defined at cbs.mpg.de.
NS records for this zone are defined at cbs.mpg.de.
Question and response
Question
dig _acme-challenge.libproxy1.cbs.mpg.de. NS
Answer
The response has no answer records.
Authority
cbs.mpg.de. 300 SOA dnsext2.cbs.mpg.de. edv.cbs.mpg.de. 2026022657 28800 7200 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0