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/soa-record-checker
SOA Record Checker
Look up a domain's Start of Authority record.
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About SOA Record Checker
SOA Record Checker looks up a domain's Start of Authority record, the DNS record that names the primary nameserver, the zone's administrative contact, and the timing values resolvers use to know when to refresh their cached copy.
Use this to confirm a zone's serial number actually incremented after a change, which is how secondary nameservers know to pull an update, or to check the refresh and retry intervals when diagnosing slow propagation.
The hostmaster field is an email address with the @ replaced by a dot, a DNS record format convention rather than a formatting error, so admin.example.com in that field means admin@example.com.
Tutorials
How DNS Records WorkWhat actually happens between typing a domain and a page loading, and what each record type in a DNS Lookup result is telling you.7 min readPointing a Domain to a New Host Without Breaking AnythingA practical order of operations for moving a domain to a new server or provider, including the mistakes that cause avoidable downtime.6 min readDiagnosing DNS Problems When a Site Will Not ResolveA checklist for working through domain resolution failures in a sensible order, from a straightforward typo to an expired registration.6 min read