My parent company uses 1.1.1.1 as a captive portal address on the guest network. Easy to remember, but cloudflare probably needs to stand up some more conventional DNS ips.
What exactly do you mean by “wasn’t assigned”? According to this article [1], 1/8 was reserved in 1981. Only from 2008 to 2010 was 1.1.1.0/24 ever truly unallocated.
If, after 8 years, most providers still haven’t moved to either private networks or officially assigned networks, honestly – they suck.
