It's very likely that they have 1.1.1.1 in their "bogons" list and have for a very long time. Bogons are a list of prefixes that most ISPs blackhole as there i

It's very likely that they have 1.1.1.1 in their "bogons" list and have for a very long time. Bogons are a list of prefixes that most ISPs blackhole as there is usually never any legitimate traffic bound for those destinations. RFC1918 addresses, for example. I can't reach 1.1.1.1 either, but 1.0.0.1 works fine. Maybe try that.