dynamic.cust.swisscom.net has no SRV records.
Question and response
Question
dig dynamic.cust.swisscom.net. SRV
Answer
The response has no answer records.
Authority
dynamic.cust.swisscom.net. 900 SOA ns11.scs-ns.ch. admin\.dns.swisscom.com. 2024100801 36000 3600 1814400 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0