DNS Checker
Free, no signup. Ask three public resolvers the same DNS question. When their answers differ, you can see the propagation evidence instead of guessing.
For PTR, enter either a reverse DNS name or an IPv4 address. Each resolver is queried independently.
Checks run from our server; we fetch the URL you enter and don't keep the results. Queries use Cloudflare, Google, and Quad9 DNS-over-HTTPS. Results are cached briefly (about one minute) so this is not an instant authoritative DNS check. Anonymous run-level outcome counters may be used for aggregate research; URLs, domains, IPs, and identifiers are never included, and no statistic is released below 100 runs.
Sample report
Illustrative example — fixed resolver answers
- Cloudflare: A 192.0.2.10 (TTL 300s)
- Google: A 192.0.2.10 (TTL 240s)
- Quad9: A 192.0.2.20 (TTL 300s)
Signal to review: resolver answers differ. This can be propagation, split-horizon behavior, or a resolver issue; it is not automatically a bad zone.
How to use it
- Enter a domain or DNS name and select the record type.
- Choose Look up DNS to query Cloudflare, Google, and Quad9 independently.
- Compare answer values and TTLs, then review mismatch or resolver-error flags.
- Use the copyable zone-file reference for notes only; edit real records at the authoritative DNS provider.
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Local data
Saved targets, named lists, and recent check summaries remain only in this browser.
Services suggested by returned records
These matches describe observed DNS dependencies only. They do not prove an account is active or identify the origin host.
Signals to review
Copy observed answers as a zone-file reference
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What the results mean
Matching values across three recursive resolvers are consistency evidence. Different TTLs alone are normal as caches age. A value mismatch means the resolver views differ. A DNS status or network failure belongs only to that resolver and is not converted into a clean answer.
How it works
The browser sends three parallel DNS-over-HTTPS requests through the bounded endpoint. The response preserves each resolver’s status, typed answers, TTLs, authority context, and errors. Deterministic comparison rules flag differing values or unavailable resolvers, explain the selected record and response status in plain language, identify a small curated set of provider-controlled hostnames only when they appear in returned records, and convert observed answers into zone-style text.
Features
- Eleven common record types including PTR and SRV.
- Side-by-side Cloudflare, Google, and Quad9 results.
- Plain-language record and DNS status explanations.
- Evidence-led delivery and email-service hints from returned hostnames.
- TTL, resolver status, and propagation flags.
- Copyable observed-answer reference.
Limitations
These are cached recursive views, not direct authoritative queries, and results are briefly cached by this service. Provider hints cover only a small curated hostname set and do not prove an account is active or reveal an origin. The tool does not trace delegation, edit records, validate DNSSEC chains, test every geographic resolver, or prove the cause of a mismatch.
Frequently asked questions
Why do the three resolvers disagree?
Different recursive resolvers can retain old answers until their TTL expires. A mismatch can indicate propagation, split-horizon DNS, or a resolver failure; it is not by itself proof of a misconfiguration.
Does the zone-file export change DNS?
No. It is a copyable representation of observed answers, not an authoritative export and never a write to your DNS provider.
Which DNS record types can I check?
The checker supports A, AAAA, CNAME, MX, TXT, NS, SOA, CAA, SRV, and PTR. PTR accepts an IPv4 address or a reverse-DNS name.
Are these authoritative DNS answers?
No. Cloudflare, Google, and Quad9 are recursive resolvers. Their cached view is useful for propagation checks, but the domain’s authoritative nameservers are the source of record truth.
Feature requests for Dns Checker
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Informazioni sullo strumento
Confronta le risposte DNS di Cloudflare, Google e Quad9 per individuare differenze di propagazione, record discordanti e segnali del resolver; copia i risultati osservati come riferimento per una zona.
Funzionalità
- Confronto indipendente tra resolver Cloudflare, Google e Quad9.
- Record A, AAAA, CNAME, MX, TXT, NS, SOA, CAA, SRV e PTR.
- TTL, valori di risposta e segnali di mismatch o errore del resolver.
- Riferimento copiabile in formato zone file, senza scrivere presso il provider DNS.
Come funziona
Inserisci un dominio o nome DNS, scegli il tipo di record e avvia la ricerca. Il tool interroga Cloudflare, Google e Quad9 separatamente, confronta valori e TTL e conserva i risultati nella sessione.
Limitazioni
- Le risposte osservate non sono un export autorevole e non modificano il provider DNS.
- La propagazione, lo split-horizon e gli errori dei resolver possono produrre risultati diversi senza dimostrare una configurazione errata.
Domande frequenti
Quali tipi di record DNS posso controllare?
Puoi controllare A, AAAA, CNAME, MX, TXT, NS, SOA, CAA, SRV e PTR.
Perché i resolver restituiscono risposte diverse?
Resolver ricorsivi diversi possono conservare risposte precedenti fino alla scadenza del TTL; la differenza può indicare propagazione o split-horizon.
Il tool modifica i miei record DNS?
No. Il report è osservativo e il riferimento copiabile non scrive mai presso il provider autorevole.
Posso usare un indirizzo IPv4 per un record PTR?
Sì. Per PTR puoi inserire un nome DNS inverso oppure un indirizzo IPv4.