mx11.ubs.open.ch has no NS records.
NS records for this zone are defined at open.ch.
NS records for this zone are defined at open.ch.
Question and response
Question
dig mx11.ubs.open.ch. NS
Answer
The response has no answer records.
Authority
open.ch. 300 SOA ns-cloud-c1.googledomains.com. cloud-dns-hostmaster.google.com. 1 21600 3600 259200 300
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0