DNS useful sites

https://dnschecker.org/

Check propagation of DNS updates/Troubleshoot external DNS site/entries.

http://www.dnsqueries.com/en/dns_lookup.php

Another lookup site.

Using “Dig” command

Googles Toolbox – Dig 

Google’s Toolbox – MX

Google’s Flush DNS record

Microsoft Troubleshooting Remote Connectivity Checker

 

 

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