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DNS is corrupted. How do I know and What to do?

As far as custom domain troubleshooting is concerned, it's not always there'll be issues with,
  1. DNS Records
  2. Who Is Issues like 
    • Domain expiration
    • clientHold
There is a case where the DNS could be corrupted. In that matter we need to know two important things.
  1. How do I know my DNS is corrupt?
  2. Where do I report about my corrupt  DNS?
How do I know my DNS is corrupt?
The diagnosis on a custom domain issue with DWI will tell you there could be an issue in DNS while WhoIs Lookup will confirm. I had to face one such thread whose diagnosis steps are shown below,
The above is the dig log of the custom URL which gave me very weird results. I went ahead and checked for expiration/non registered URL/clientHold at Who Is Lookup,
Registry Domain ID: 1619884945_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.enom.com
Registrar URL: www.enom.com
Updated Date: 2016-10-12T03:07:49.00Z
Creation Date: 2010-10-11T18:39:00.00Z
Registrar Registration Expiration Date: 2016-10-11T17:39:26.00Z
Registrar: ENOM, INC.
Registrar IANA ID: 48
Domain Status: clientTransferProhibited https://www.icann.org/epp#clientTransferProhibited

The domain is really registered and that is the very reason we get these details. This confirmed there is no issues with DWI or WhoIs. Now comes the third tool IntoDNS.

What is IntoDNS? 
IntoDNS is again an online tool that helps us check if the DNS is healthy.

How to use Into DNS?
1. Go to http://www.intodns.com
2. Provide your naked domain URL and Report as shown below,
3. As you scroll down, you might see an error with red highlights as shown below,

This will finally tell you your DNS is corrupt.

Where do I report about my corrupt DNS?
The DNS is corrupt and the DNS is offered to you by your registrar. Therefore as you have enough fact that there's an issue at the registrar's end, you may please go ahead and contact the registrar sharing screen shots and links to IntoDNS.

To know how to find who is your registrar, do a Who Is Lookup.
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