NsLookup.io - A simple and powerful tool for querying DNS records
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.
DNSChecker.org - Check DNS Propagation worldwide. DNS Checker provides name server propagation check instantly. Changed nameservers so do a DNS lookup and check if DNS and nameservers have propagated.
DNS Check - DNS Check enables you to easily monitor, share and troubleshoot DNS records.
ViewDNS.info - Free DNS related tools including Reverse IP Lookup, DNS Propagation Checker, Chinese Firewall Test...
DNSPropagationTool.com - Global DNS Propagation Checker