Beta RazorAPI is in beta testing — new registrations are closed for now. Public launch coming soon. Details

Online nslookup · dig in your browser

DNS Lookup Tool

Free online DNS lookup tool — check DNS records and nameservers for any domain. Query A, AAAA, MX, TXT, NS, SOA, and CNAME like dig or nslookup, with TTL, WHOIS-lite, and a JSON API.

Check DNS records View docs

Playground

Look up live DNS records and inspect a WHOIS-lite summary.

API key Optional

Optional — try the API without a key (shared tools quota). Public signup is closed during beta — learn more.

Lookup

Enter a domain, choose record types, and run the query.

GET /dns/lookup

Results

No lookup yet

Enter a domain, pick record types, then run Lookup DNS.

Raw JSON response

Run a lookup to see the API response.

What is a DNS lookup?

Online nslookup for the browser — the same answers dig and nslookup give from a terminal.

A DNS lookup asks the Domain Name System what records exist for a domain name. Websites need A / AAAA addresses, email needs MX and usually TXT (SPF, DKIM, DMARC), and the zone itself is delegated with NS and described by SOA. RazorAPI’s free DNS lookup tool returns those records in one place, with TTL and a WHOIS-lite summary derived from DNS — no CLI install required.

Unlike a local nslookup that only uses your ISP resolver, this page runs the query on RazorAPI servers so you can share results, inspect multiple record types together, and call the same data from the DNS Lookup API.

How to use this DNS lookup

Three steps — the workflow people expect from dig web UIs and online nslookup tools.

  1. Enter the domain

    Type an apex domain (example.com) or host (www.example.com, _dmarc.example.com) in the playground above.

  2. Choose record types

    Defaults cover A, AAAA, MX, and TXT. Use All for NS, SOA, and CNAME, or search the multi-select for a single type.

  3. Read results & JSON

    Review cards with values and TTL, skim WHOIS-lite signals, then copy JSON or open the JSON tab for API-shaped output.

Open the DNS playground

Supported DNS record types

Every active type our checker and API can query — the set most DNS lookup pages highlight first.

Type What it stores Typical use
A IPv4 address Point a hostname at a server (website outage checks)
AAAA IPv6 address Confirm IPv6 reachability alongside A
MX Mail exchangers + priority Email routing / MX record checker
TXT Arbitrary text SPF, DKIM, DMARC, domain verification
NS Authoritative nameservers Delegation and nameserver lookup
SOA Zone authority + serial Refresh/retry/expiry and primary NS
CNAME Canonical name (alias) Follow CDN or subdomain aliases

When to run an online DNS lookup

Same jobs people open MXToolbox, nslookup.io, or dig for — without leaving the browser.

Verify DNS after a change

Confirm A/AAAA, NS, or CNAME updates landed. Remember TTL cache — “propagation” is mostly resolvers holding old answers until TTL expires.

Email & SPF audit

Check MX priority and TXT for SPF/DKIM/DMARC strings before cutovers — the classic SuperTool / MX lookup workflow.

Shareable dig-style proof

Copy JSON for tickets or call /dns/lookup from CI — keep human-readable cards for teammates who do not use a terminal.

TTL and DNS propagation

Why two DNS checkers can disagree for a while after you edit records.

TTL (Time To Live) is how long resolvers may cache an answer before asking again. A 300-second TTL refreshes in about five minutes; 3600 is common for steady records; 86400 (24h) favors performance over fast flipovers. “DNS propagation” is mostly that cache draining — not a special global sync job.

RazorAPI may briefly cache identical lookups for speed and rate limits; the records themselves still carry the TTL your zone publishes. If results look stale, wait for TTL, lower TTL before a planned migration, or compare with another public checker.

Why use RazorAPI DNS

Free online DNS checker with dig-style results, WHOIS-lite, and a developer API — built for worldwide lookups.

Multi-type in one query

Check A, AAAA, MX, TXT, NS, SOA, and CNAME together instead of re-running dig for each type.

Cached & rate-limited

Lookups are cached and capped per IP and plan so the public DNS checker stays fast under global traffic.

WHOIS-lite + JSON API

DNS-derived WHOIS-lite digest, Copy JSON, or call /dns/lookup with your RazorAPI key.

DNS lookup FAQ

nslookup vs online tools, TTL, MX/SPF checks, WHOIS-lite, and the DNS Lookup API.

What is a DNS lookup?

A DNS lookup queries the Domain Name System for records tied to a domain name — A/AAAA (IP addresses), MX (mail servers), TXT (SPF/DKIM/verification), NS (nameservers), SOA, and CNAME. It is the same idea as dig or nslookup, available in your browser.

How do I do a DNS lookup online?

Enter a domain (for example google.com), choose record types (or All), and click Lookup DNS. RazorAPI returns structured records with TTL and a WHOIS-lite summary. No install required.

What is the difference between this tool and dig / nslookup?

dig and nslookup are CLI tools that usually use your local or ISP resolver. This online DNS lookup runs on RazorAPI servers, returns multi-type results in one call, shows a readable UI plus raw JSON, and exposes the same data through a DNS Lookup API.

Which DNS record types are supported?

A, AAAA, MX, TXT, NS, SOA, and CNAME. Defaults are A, AAAA, MX, and TXT — the set most people need for websites and email. Select All for nameservers, SOA, and aliases.

Can I check MX and SPF for email?

Yes. Query MX to see mail exchangers and priority, and TXT to inspect SPF and other verification strings. That mirrors how mail admins validate deliverability with dig TXT/MX.

What is TTL in DNS results?

TTL (Time To Live) is how many seconds resolvers may cache a record before refreshing. Lower TTLs propagate changes faster; higher TTLs reduce query load. Common values range from a few minutes to 24 hours.

Why might DNS lookup results look wrong or outdated?

Resolvers cache records until TTL expires, so recent DNS changes can take time to appear everywhere (DNS propagation). Different tools may also query different resolvers. Try again after TTL or compare with another checker.

Is this a full WHOIS lookup?

No. WHOIS-lite summarizes what DNS itself reveals (resolves, IPv4/IPv6, mail, nameservers). It is not a registrar port-43 WHOIS scrape of owner contact details.

Is the DNS lookup free? Is there an API?

The playground is free with shared rate limits. Developers can call GET /api/v1/dns/lookup with an API key for JSON responses, caching, and plan-based quotas.