time.cloudflare.com (the NTP/NTS service) uses these IPs:
time.cloudflare.com has address 188.8.131.52
time.cloudflare.com has address 184.108.40.206
time.cloudflare.com has IPv6 address 2606:4700:f1::1
time.cloudflare.com has IPv6 address 2606:4700:f1::123
There is an ROA for 220.127.116.11/24, but there is none for 2606:4700:f1::/48. See e.g.:
While Cloudflare has over 200 unsigned routes, this one seems particularly concerning, since the NTP service is (unlike NTS) unauthenticated, and the IPs are seemingly not announced by every PoP, putting them at greater risk for hijacking.
Are there plans to sign that announcement?