SOA records basically known as “A Start of Authority Records” are a type of record that contains administrative information about the server. The SOA record stores information about the name of the server, the email address of the hostmaster. This is basically used by those users who want to contact the administrator of a domain for any kind of queries related to the website.
What are they used for? [Updated May 2019]
SOA records are basically used by those persons who want to contact the 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 the 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