DNS SOA Record Lookup - Check Start of Authority
Look up SOA records to view domain authority details including primary nameserver, admin contact, serial number, and zone timing parameters.
Understanding This Tool
What It Does
Query the SOA (Start of Authority) record for a domain to access zone-level DNS information including serial numbers, refresh rates, and authoritative nameserver details.
Understanding the Results
- Primary Nameserver: The main authoritative nameserver for the zone
- Responsible Person: Email address of the person responsible for the zone
- Serial Number: Version number of the zone file
- Refresh Interval: How often secondary servers check for updates
- Retry Interval: How long to wait before retrying if primary is down
- Expire Time: When zone data becomes invalid if not updated
- Minimum TTL: How long resolvers cache the fact that a record does not exist (the negative-cache TTL); the default record TTL is now set separately via the $TTL directive
Common Use Cases
- Zone Administration: Understand zone configuration and authority structure
- DNS Troubleshooting: Diagnose zone-level DNS problems
- Secondary DNS: Configure secondary nameservers with proper refresh rates
- DNS Security: Verify proper zone management and DNSSEC configuration
Pro Tips & Best Practices
- Serial Number: Incremented each time the zone is modified
- Refresh Rate: Typical values are 3600 to 86400 seconds (1 hour to 24 hours)
- Zone Transfers: Secondary servers use SOA to determine if zone updates are needed
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How this tool works: This tool runs in your browser and on our server in real time. Depending on the tool, results are computed directly from the input you provide or retrieved from live, authoritative data sources at the moment you run a lookup. We do not sell your data, and your lookups are kept private — any history shown here is stored only on your device.