Okay, I found something that is not working anymore.
Look up IP on a regional whois-server - action=trackip;searchip
It appears that RIPE (Europe, the Middle East and parts of Africa and Asia) has changed the way their site does the searches, so a new URL has to be set for it:
Current URL when click:
https://apps.db.ripe.net/search/query.html?searchtext=0.0.0.0
New would be:
https://apps.db.ripe.net/db-web-ui/query?bflag=false&dflag=false&rflag=true&searchtext=0.0.0.0&source=RIPE
This is definitely different looking than they had it before, so I'm guessing they really redid their whole system. So, may want to make sure on the way to set up the searches. My "new" may be a bit off, when coming from a site.
Thanks for the report ... yeah that is a change, surprised they don't have a redirect setup.
Looks like you do not need to set the flags (as those are the default) so just a https://apps.db.ripe.net/db-web-ui/query?searchtext=0.0.0.0 should work.