What are some common DDNS providers that might use domains like 00h7112288999000.site?

Several DDNS providers could be responsible, including No-IP, DynDNS (now Oracle Dyn), DuckDNS, and FreeDNS. The specific provider would depend on the system using the domain. Examining the IP address and network information might provide clues, but it's often challenging to pinpoint the exact provider.