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SOA Records1:35 with Jason Seifer
The Start of Authority is the first entry in the DNS zone file. The SOA indicates that this DNS name server is the best source for data within this domain.
Start of Authority Information and Format:
- Source host
- Contact email (admin.example.com)
- Serial Number
- Refresh time in seconds
- Retry Time
- Expire Time
- Minimum TTL
The last type of DNS record we're going to talk about is something called the SOA or start of authority.
When you request a DNS zone file from a name server,
this is always going to be the first entry in the DNS zone file.
The start of authority record indicates that this DNS name server is the best source for data within this domain.
It tells things like how often the domain name was updated, when to check for more information,
who manages it, and more.
Now the SOA is usually handled by the name server in the case that you sign up for alternative DNS hosting.
The format is the following: First it's the source host contact email with a dot instead of an at sign.
For example, it could be something like admin.example.com.
This would mean email contacts go to firstname.lastname@example.org.
The next entry is the serial number followed by the refresh time in seconds
which is how often you should look for updates to this domain.
There's also the retry time and the expire time.
These both indicate the TTL that your client would use when retrying or expiring entries within this domain.
Finally there's something called the minimum TTL which can be specified in the SOA record.
This is something that's going to be the default time to live for all of the records in the zone file.
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