DNS Checker
A full report on a domain's DNS, checked against its own nameservers rather than through a resolver — so it can tell you whether the registry agrees with the zone, whether your nameservers agree with each other, and whether any of them is answering queries it should not.
DNS breaks quietly and at the worst time
Nothing here changes until the day it does — a registrar update that half-applied, a nameserver that stops answering, a zone transfer that falls behind. Pingniner watches domains, certificates and the sites behind them continuously, and tells you the day something moves.
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Other free tools: Is it down? · Speed test · DNS checker · Blacklist checker · SSL checker · Cron tester · SPF/DMARC · Redirects · Domain lookup · SLA calculator