@mjibrower Oh how bizarre. Thanks for the heads up.
My site is hosted on a Linode, a cloud hosting service where many virtual servers can share an address. Maybe there’s another site with the same external IP that’s dubious?? (My site does not “provide information or tools on how to bypass Internet access controls and browse the Web anonymously,” although maybe it should!)
If you have a chance to send it to your IT folks, I’d be curious to hear what they say.