When you register DNS names and/or IP addresses you can use an anonymizing service to keep your details private. This can be bypassed when needed (eg law inforcement investigations, etc) but it helps cut down on spam, etc so is quite common.
Last night I came at it a different way, first identifying the host IP address using a different lookup tool, then tracing the address via WHOIS, and it definitely looks like they’re using a Russian company (DDOS-Guard Corp) either for hosting or as a proxy to mask the real IP address and host.
More details in this thread, for those who missed it: