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.

DNSInspect - DNS is a free online service to check your domain’s servers for common DNS and mail errors and produces a report with explanations how to fix them.

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.

MxToolBox - All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool.

DNS Checker Tool - Check Domain Name System (DNS) records for any website.

intoDNS - IntoDNS checks the health and configuration and provides DNS report and mail servers report.