o1.ptr685.privent.ch has no NS records.
NS records for this zone are defined at ptr685.privent.ch.
NS records for this zone are defined at ptr685.privent.ch.
Question and response
Question
dig o1.ptr685.privent.ch. NS
Answer
The response has no answer records.
Authority
privent.ch. 1800 SOA ns1.digitalocean.com. hostmaster.privent.ch. 1767377870 10800 3600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0