I don't know, it's a good question. I don't have the IP addresses cached.

NPR notes that the report is here [1], so if someone is trying to hide it, they're not doing a particularly good job.

[1] https://repository.library.noaa.gov/view/noaa/61592

https://dnshistory.org/historical-dns-records/a/globalchange...

It seems to be maybe AWS, and manual IP action doesn't get anything.