h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

The internet is a part of modern life and, as such, it is of course represented in fiction. Sometimes, characters in a book, film, television and so on will mention a URL for a plot-relevant website, or even just a throwaway remark, and I am sure I am not the only one who has occasionally looked them up on the real internet (to the extent that there is such a thing).
Usually, they turn out to be little more than an advertisement for the work in which they appear, bought by the studio, publisher or whatever and emblazoned with a hastily put together bit of branded artwork. As an example, I do wonder what - if anything - would happen if I were to enter my email into this bit of neat branding for the (excellent) graphic novel series 'The Wicked + The Divine' (which I highly recommend, but that's another story...): https://tinyletter.com/dionysiankissstory .
Sometimes, they don't exist at all, a recklessly unclaimed domain name or one that has been claimed but left vacant. However, some have clearly had more effort put into them.
So, what gems have you spotted?

I don't think there were any URL's in the Anthony Trollope novel I just finished reading.

You must not have been reading Trollope's science fiction, then.

'So I got on to my steam-tricycle, and in a few minutes I was at Little Christchurch....'

'The Fixed Period', set in 1980.

Euthanasia seems like a stretch for Trollope .

Frank Schätzing (of The Swarm fame) wrote a science fiction thriller called LIMIT in which various websites with specific URLs play a major plot-relevant role. When I read the book a few years after publication, all URLs yielded no results whatsoever.

Sounds good! I've just placed a request on the first copy that becomes available in my library network.