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I then went to Spamhaus.org to check, and sure enough an entire IP range in which my IP addresses are in was blacklisted as my Hosting provider (I have a Dedicated Server) was branded a 'Sleaze Host. (Although the list of IPs was enormous, with all sorts of #*$! and Warez domains, my own IP addresses (7) were not listed)
Does being in such a 'bad' IP neighbourhood affect SE rankings? (I haven't noticed any decline yet in the SERPs or in visitor numbers)
BTW, my hosting provider is working on the problem.
Having international IP addresses isn't such a good idea either.
It's always best to pay a little extra and walk to your neighbourhood web hosting company, do a little IP research, ask a few questions, get to know them by name, send a holiday greeting ... it's generally the safest IP bet.
Google used to provide lists of spammed out IPs
I didn't know that, food for thought...
My hosting provider is local (the Netherlands), but they are a budget host. I might have to look into moving. When checking the blacklist history I see that this is not the first time this IP range has been blocked.