Find out if a domain name is listed in any of the major URI and domain name black lists.
Check if any of the IP addresses in a domain name's most common DNS Resource Records is listed in a major IP DNS Black List.
The domain names in the URI Black Lists are: dedicated to the propagation of malware, used for phising, used for spamming, or advertized though spamming.
IPduh suggests to not visit the domain names listed on the URI Black Lists.
To check if an IP address is listed in a major DNS Black List use ip/dnsbl