http://www.network-tools.com/ http://www.iptools.com/ www.all-nettools.com http://www.my-addr.com/ http://member.my-addr.com/ http://www.mxtoolbox.com/ << Blacklist IP check, SMTP Check, DNS Lookups etcc.. http://ping.eu / << Ping, Trace Route, DNS, Port, proxy, country by ip, etc.. http://just-ping.com << ping from various countries http://centralops.net/co/ << Ping, Trace Route, DNS, etc.. http://www.hcidata.info/host2ip.htm << Hostname to IP & IP to hostname http://aruljohn.com/ip2hostname.html << IP to hostname http://www.selfseo.com/ping_test.php << ping test http://www.dnsbl.info / << DNS Blacklists/spam blocking lists http://www.subnet-calculator.com/