DNS Health Check
Check that a domain's nameservers all answer, agree with each other and follow best practices.
Free, no account needed.
What this check looks at
- The NS records for the domain and whether each nameserver resolves.
- Whether every nameserver answers for the zone.
- Whether they all report the same SOA serial, meaning they are in sync.
- Best practices such as having at least two nameservers.
Frequently asked questions
Why do my nameservers show different serials?
A secondary nameserver hasn't picked up the latest version of the zone. It usually catches up within the SOA refresh time; if not, check zone transfers at your provider.
Related tools
- NS Record LookupLook up the nameservers responsible for a domain.
- SOA Record LookupLook up a zone's start-of-authority settings.
- Dig: Online DNS LookupQuery any DNS record type the way the dig command does, from Google Public DNS or Cloudflare, with TTLs, the response status and DNSSEC validation.
- Email Domain Health CheckRun every email and DNS check for a domain at once and get a single report with everything that needs attention.