These are the tools that I use for exploring Internet servers:
My domain name has been Black_List_check black listed a couple times. This was always due to the fact that I was colocated on some network segment that also happened to host suspected spammers. I managed to get my domain cleared and now I moved to a fairly reputable network neighborhood so hopefully I won't have to deal with this again soon. I hate most of these black lists. They cause more trouble than they are worth.