AT&T explains why it blocked Cloudflare DNS: It was just an accident

AT&T has been blocking the new Cloudflare DNS service, but AT&T says the blocking was unintentional and that it will fix the problem soon. The blocking is affecting AT&T home Internet customers who use an AT&T gateway. "With the recent launch of Cloudflare's 1.1.1.1 DNS service, we have discovered an unintentional gateway IP address conflict with 1 of their 4 useable IPs and are working to resolve the issue," said AT&T. Most of AT&T's customers should be able to access Cloudflare DNS using the alternate 1.0.0.1 address. AT&T didn't say when it will roll out a fix.