All-in-One Checker

http://www.mxtoolbox.com/SuperTool.aspx

IP Blacklist Checker

http://www.blacklistalert.org/

http://www.anti-abuse.org/multi-rbl-check/

http://www.dnsbl.info/

 Domain Checker

http://www.who.is/

http://whois.domaintools.com/

http://www.whois.sc/