SOA records basically known as “A Start of Authority Records” is a type of records which contains administrative informations about the server. The SOA record stores information about the name of the server, email address of the hostmaster. This is basically used by those users who want to contact administrator of a domain for any kind of queries related with the website.
What are they used for? [Updated May 2019]
SOA records are basically used by those person who wants to contact domain owner. Suppose if you want to find the contact details of the owner of the domain then lookup for SOA records of domainname.com by visiting Intodns.
You can find SOA record of any domain by going clicking here
You can check this below
How do you update SOA records? [Important]
You can update these records from Edit DNS Zone in WHM