NameserverChecker.com - Nameserver Checker Tool
CheckNameserver.com - Nameserver Checker Tools
DNS Checker Tool - Check Domain Name System (DNS) records for any website.
OpenDNS - OpenDNS provides faster and safer Internet access for your home or Business.
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.
CheckDNSserver.com - Check DNS Server Tool