DNS (Domain Name System) is the internet's phonebook. It translates human-readable domain names (like example.com) into IP addresses (like 93.184.216.34) that computers use to route traffic. Without DNS, you would need to memorise IP addresses for every website.

What is the difference between an A record and an AAAA record?

An A record maps a hostname to an IPv4 address (e.g. 93.184.216.34). An AAAA record maps a hostname to an IPv6 address (e.g. 2606:2800:21f:cb07:6820:80da:af6b:8b2c). Most modern domains publish both for dual-stack compatibility.

What is an MX record?

MX (Mail Exchange) records specify which mail servers are responsible for receiving email for a domain. Each MX record has a priority number — lower numbers have higher priority. Email servers try the lowest-priority MX server first.

What is a TXT record used for?

TXT records store arbitrary text associated with a domain. Common uses include SPF (email sending policy), DKIM (email signature keys), DMARC (email authentication policy), Google site verification, and SSL certificate validation challenges.

What is a CNAME record?

CNAME (Canonical Name) records create an alias from one hostname to another. For example, www.example.com might be a CNAME to example.com. Note: CNAME records cannot be used at the zone apex (root domain) — use ALIAS or ANAME records for that.

What is DNS-over-HTTPS?

DNS-over-HTTPS (DoH) sends DNS queries over HTTPS instead of plain UDP, preventing network observers from seeing which domains you are resolving. This tool uses Cloudflare's public DoH endpoint (cloudflare-dns.com/dns-query).

Why is my DNS change not showing yet?

DNS changes propagate gradually through the internet's caching infrastructure. The TTL (Time To Live) value on each DNS record controls how long resolvers cache it. Lower TTL = faster propagation. After a change, full global propagation can take from minutes to 48 hours.

What is a CAA record?

CAA (Certificate Authority Authorization) records specify which certificate authorities (CAs) are allowed to issue SSL certificates for a domain. This prevents unauthorised CAs from issuing fraudulent certificates. Example: 0 issue "letsencrypt.org".

Web Tools /

DNS lookup

Query any DNS record type for any domain using Cloudflare DNS-over-HTTPS. Results are fetched directly from your browser — nothing passes through jarvisbox.

DNS queries go directly from your browser to cloudflare-dns.com.

How to use

Enter a domain name (e.g. github.com) in the input field.
Select the DNS record type you want to query.
Click Lookup — results appear in seconds.
Change the record type and look up again without re-entering the domain.

Common use cases

Email configuration — check MX records to see which mail servers handle email for a domain.
SPF / DKIM verification — query TXT records to confirm SPF and DKIM are configured correctly.
DNS propagation — verify that a recently changed A or CNAME record has propagated globally.
SSL verification — check CAA records to see which CAs are authorised to issue certificates.

Also see: IP Info Lookup and Robots.txt Validator.

よくある質問

What is DNS?: DNS (Domain Name System) is the internet's phonebook. It translates human-readable domain names (like example.com) into IP addresses (like 93.184.216.34) that computers use to route traffic. Without DNS, you would need to memorise IP addresses for every website.
What is the difference between an A record and an AAAA record?: An A record maps a hostname to an IPv4 address (e.g. 93.184.216.34). An AAAA record maps a hostname to an IPv6 address (e.g. 2606:2800:21f:cb07:6820:80da:af6b:8b2c). Most modern domains publish both for dual-stack compatibility.
What is an MX record?: MX (Mail Exchange) records specify which mail servers are responsible for receiving email for a domain. Each MX record has a priority number — lower numbers have higher priority. Email servers try the lowest-priority MX server first.
What is a TXT record used for?: TXT records store arbitrary text associated with a domain. Common uses include SPF (email sending policy), DKIM (email signature keys), DMARC (email authentication policy), Google site verification, and SSL certificate validation challenges.
What is a CNAME record?: CNAME (Canonical Name) records create an alias from one hostname to another. For example, www.example.com might be a CNAME to example.com. Note: CNAME records cannot be used at the zone apex (root domain) — use ALIAS or ANAME records for that.
What is DNS-over-HTTPS?: DNS-over-HTTPS (DoH) sends DNS queries over HTTPS instead of plain UDP, preventing network observers from seeing which domains you are resolving. This tool uses Cloudflare's public DoH endpoint (cloudflare-dns.com/dns-query).
Why is my DNS change not showing yet?: DNS changes propagate gradually through the internet's caching infrastructure. The TTL (Time To Live) value on each DNS record controls how long resolvers cache it. Lower TTL = faster propagation. After a change, full global propagation can take from minutes to 48 hours.
What is a CAA record?: CAA (Certificate Authority Authorization) records specify which certificate authorities (CAs) are allowed to issue SSL certificates for a domain. This prevents unauthorised CAs from issuing fraudulent certificates. Example: 0 issue "letsencrypt.org".

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