What is an SOA record and why is it important?

An SOA (Start of Authority) record is a critical DNS record that identifies the primary nameserver for a domain and contains essential zone administration information. It's important because it controls how secondary nameservers interact with your primary nameserver, manages zone transfers, and establishes the authoritative source for your DNS zone. Every domain must have exactly one SOA record.

How do I find my domain's SOA record?

You can find your domain's SOA record by using SOA Lookup tool—simply enter your domain name and click lookup. Alternatively, you can use command-line tools like 'nslookup -type=SOA example.com' or 'dig example.com SOA' to retrieve the information directly from your nameservers.

What do the refresh, retry, and expire values mean?

The refresh value tells secondary nameservers how often to check for zone updates from the primary nameserver. The retry value specifies how long to wait before retrying a failed zone transfer. The expire value determines the maximum time a secondary nameserver can serve zone data if it cannot contact the primary. These values are critical for maintaining DNS consistency across your infrastructure.

Can I change my SOA record settings?

Yes, you can modify SOA record settings through your domain registrar's control panel or your DNS hosting provider's management interface. Changes typically include updating the serial number, refresh/retry/expire intervals, and the responsible administrator email. Always increment the serial number when making changes to ensure nameservers recognize the update.

Why is my SOA record showing different values on different nameservers?

Different SOA values on nameservers indicate incomplete DNS propagation or zone synchronization issues. This commonly occurs after recent changes or during zone transfers. Use SOA Lookup to compare records across nameservers and identify discrepancies. Wait for DNS propagation to complete (typically 24-48 hours) or contact your DNS provider if inconsistencies persist.

SOA Lookup

How to Use SOA Lookup

When to Use SOA Lookup

Technical Information

Frequently Asked Questions