I'm having the same issue. I'm sure its probably some bug in dyn dns upadater triggered by comcast. This happend to me today 7/26/19. Dyndns thinks my IP is 220.127.116.11 but it isn't. Its 73.xxx.xxx.xxx. I'm running dyndns updater on windows server 2008.
thecastle2, you might be seeing a new IP because of our switch to Domain Name System Security Extensions. Customers are now utilizing our DNSSEC servers with IP addresses of 18.104.22.168 and 22.214.171.124.
Customers are now utilizing our DNSSEC servers with IP addresses of 126.96.36.199 and 188.8.131.52.
I thought that this has been in place for years already @ComcastKenF ?
EG, perhaps so -- this is the closest thing I could find; the document is in the present tense.
I know for a fact that it has. I remember very well when the Anycast servers / DNS SEC were / was implemented by them.