Thank you for the replies.
I'll have to do a little research on Spamhaus. I'm reluctant to put my ip address into an unknown search engine.
When I type in Pprune.org or the Pprune ip address into the box, the blue highlighter goes as far as the end of the word Pprune and then, that's it. The page doesn't change at all or sometimes just goes blank with the message that the server is not responding.