NSlookup is a free online DNS lookup tool that checks any DNS record type (A, AAAA, MX, NS, TXT, CNAME, SOA, CAA, SRV, PTR) for any domain. It uses DNS-over-HTTPS APIs from Google, Cloudflare, Quad9 and OpenDNS — running 100% in your browser with no backend.

How does it work without a backend?

NSlookup uses the DNS-over-HTTPS (DoH) standard (RFC 8484). Your browser directly queries providers like Google (dns.google) and Cloudflare (cloudflare-dns.com) via their JSON API over HTTPS. No data passes through any intermediate server.

Can I compare DNS results from multiple providers?

Yes. Click 'Compare All' to simultaneously query Google, Cloudflare, Quad9 and OpenDNS and view results side-by-side. Useful for spotting DNS propagation differences.

Can I share a DNS lookup?

Yes. Every lookup updates the URL (e.g. ?domain=example.com&type=MX) so you can copy and share it directly.

DNS Lookup & Records Checker

Check A, MX, NS, TXT, CNAME and more for any domain — instantly via Google, Cloudflare, NextDNS, OpenDNS & AdGuard DNS.

DNS Record Types

A Record

Maps a domain to an IPv4 address. The most common DNS record type.

AAAA

AAAA Record

Maps a domain to an IPv6 address (128-bit).

MX Record

Specifies mail servers for a domain, with a priority value.

NS Record

Lists the authoritative name servers for a domain.

TXT

TXT Record

Text data — used for SPF, DKIM, DMARC, and site verification.

CNAME

CNAME Record

Creates an alias pointing one domain name to another.

SOA

SOA Record

Start of Authority — zone metadata, serial numbers, refresh intervals.

CAA

CAA Record

Specifies which Certificate Authorities may issue SSL/TLS certificates.

SRV

SRV Record

Defines hostname and port for specific services (SIP, XMPP, etc.).

PTR

PTR Record

Reverse DNS lookup — maps an IP address back to a hostname.

DS Record

DNSSEC delegation signer — links parent and child zones.

FAQ

What is a DNS lookup?

A DNS lookup queries the Domain Name System to translate a human-readable domain (like example.com) into machine-readable records — IP addresses, mail servers, name servers, and more.

How does this work without a server?

NSlookup uses DNS-over-HTTPS (DoH). Your browser directly calls public DNS JSON APIs from Google, Cloudflare, Quad9 and OpenDNS. No data goes through any intermediate server.

Why do results differ between providers?

Different resolvers may have different cached data or see propagation updates at different times. Use "Compare All" to spot these differences instantly, side-by-side.

How do I check DNS propagation?

Click "Compare All" to query Google, Cloudflare, Quad9 and OpenDNS at once. If all resolvers return the same value, propagation is likely complete globally.

How do I check SPF or DKIM records?

SPF is stored in a TXT record on the root domain. DKIM is a TXT record on the selector subdomain — e.g. default._domainkey.example.com.

Can I bookmark or share a lookup?

Yes. Every lookup updates the URL — e.g. ?domain=example.com&type=MX. Copy the URL to share or bookmark the result.