A Start of Authority (SOA) record, sometimes called a serial number, is assigned to every domain and changes everytime its DNS settings change. For example, if example.com is pointed to InMotion Hosting nameservers, we create a SOA record for the domain in our authoritative DNS records and update it as you change DNS settings.
A common reason to check a domain SOA record is to ensure a recent DNS change has propagated. For example, the record may have changed to improve overall email authentication. A successful DNS change for this modification would be described as having “propagated.” Below we cover how to view and update your SOA record.
Here’s the breakdown of a SOA record: domain.com. ns1.inmotionhosting.com. 2018102905 86400 7200 3600000 86400.
|Domain||Followed by primary nameserver.|
|2018102905||YYYYMMDD (Year, Month, Day) date format and ## update number|
|86400||Seconds before the zone should be refreshed (1 day)|
|7200||Seconds before a failed refresh should be retried (2 hours)|
|3600000||Seconds before a zone is no longer considered authoritative (5 weeks 6 days 16 hours)|
|86400||Seconds before a resolver should assign a negative result for a subdomain before retrying(1 day)|
Note: You can convert seconds to days using an online including the DuckDuckGo converter.
View Your SOA Record
SSH command dig can show the same information.
dig SOA domain.com ;; ANSWER SECTION: domain.com. 86400 IN SOA ns1.inmotionhosting.com. 2018102905 86400 7200 3600000 86400
Add +multiline to the command for more details.
dig SOA +multiline domain.com ;; ANSWER SECTION: domain.com. 86316 IN SOA ns1.inmotionhosting.com. ( 2018102905 ; serial 86400 ; refresh (1 day) 7200 ; retry (2 hours) 3600000 ; expire (5 weeks 6 days 16 hours) 86400 ; minimum (1 day) )
Update SOA Record
Updating DNS records generally forces the SOA record to update automatically within 24-48 hours. If your SOA record hasn’t updated after a recent change, you’ll need to edit another DNS record and/or contact Live Support to update this for you.
Update SOA in WHM
VPS users can force SOA record updates in WHM as root.
- Log into WHM.
- On the left, select Edit DNS Zone.
- Select the domain.
- Under the nameserver is the current SOA record. For example:
2018102906 Serial Number
To update the SOA record, increase the last digit pair by one. For example,
2018102906 to 2018102907 or
2018102929 to 2018102930.
- Press Save at the bottom.
The DNS changes should propogate within 24-48 hours.