[forgotpwd16]

Were those addresses used for anything or simple domain squatting?

[lxgr]

They were great memorable and ad-free sites that simply showed you your own (or your NAT's) public IP, as seen by the HTTP server.

[johng]

Looks like he had useful info up for people.... I never heard of it before today either: https://ip4only.me/home.cgi

[leemelone]

https://web.archive.org/web/20241203115654/http://ip4.me/

[F_r_k]

To know your IP

[GJim]

I'm puzzled why you have been downvoted for asking a genuine question (and all credit to those who have taken time to respond to you).

Perhaps the downvoters would care to explain their actions?

[cedilla]

The question may be genuine but its phrasing probably suggests an allegation to most readers.

[syntheticnature]

I didn't downvote, but the question was answerable by simply visiting the domains typed into the comment.