xfinitycom-anycast-1p.slb.comcast.com has no SRV records.
Question and response
Question
dig xfinitycom-anycast-1p.slb.comcast.com. SRV
Answer
The response has no answer records.
Authority
slb.comcast.com. 900 SOA dns101.comcast.net. hostmaster.comcast.com. 55031 7200 3600 604800 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0