ViewDNS.info - Free DNS related tools including Reverse IP Lookup, DNS Propagation Checker, Chinese Firewall Test...
DomainTools - Domain name research, including comprehensive Whois Lookup, Reverse Whois Lookup and Whois History.
Whats My DNS - Instantly check your domain names current IP address and DNS record information against multiple name servers located in different parts of the world.
Online Domain Tools - Online-Domain-Tools.com makes your online life easier and happier.
NsLookup.io - A simple and powerful tool for querying DNS records
DNS Checker Tool - Check Domain Name System (DNS) records for any website.