ns12.dynamicnetworkservices.net has no SRV records.
Question and response
Question
dig ns12.dynamicnetworkservices.net. SRV
Answer
The response has no answer records.
Authority
dynamicnetworkservices.net. 1800 SOA dynamicnetworkservices.net. hostmaster.dyndns.com. 2025111101 10800 1800 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0