Simple network tools. Good to check DNS because resolving is been done on server side
Online Service um network Eigenschaften der eigenen IP abzufragen
understand the rest of the page before mailing me.
countries.nerd.dk is NOT a list of spammers, it is an IP-to-country DNS mapping service.
Webanzeige von DNS Informationen
Several SFP mail and DNS tools
Umfangreiche Informationen zu IPs oder Domainnamen
Informationen zu IP Adressen abfragen (AS, RBL, DNS, Routen...)