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DNSLab
Live · Free on the web

DNS, email and network tools, fast and clean.

DNSLab is a free toolbox for diagnosing DNS, email deliverability and network problems. More than 50 tools — MX, SPF, DKIM, DMARC, blacklist, DNSSEC, WHOIS and more — in one clean interface, and every result is a link you can share. Sign up for free to monitor your sites and publish status pages.

Open DNSLabSee the API

Free tools · No sign-up · English and Turkish

Why DNSLab

Answers you can trust, and share

Made for the people who keep domains, mail and networks running.

Every result is a link

A lookup opens at an address like dnslab.io/en/mx/example.com. Bookmark it or send it to a colleague, and the same lookup opens for them — no forms, nothing to retype.

Live answers

Each query runs the moment you submit it, so you see what is published right now, not what a resolver cached hours ago.

Safe by design

Lookups run in an isolated worker fleet behind strict SSRF protection. Certificate and key tools run in your browser, so nothing is uploaded.

The toolbox

More than 50 tools in seven groups

From a single MX record to a full domain health report.

DNS records

Query any record type and catch misconfigurations before they cause an outage.

  • A
  • AAAA
  • MX
  • CNAME
  • NS
  • TXT
  • SOA
  • SRV
  • CAA
  • PTR
  • NAPTR
  • TLSA

DNSSEC

Check the signatures and the chain of trust down from the parent zone.

  • DNSKEY
  • DS
  • RRSIG
  • NSEC
  • NSEC3PARAM

Email

Find out why mail lands in spam, and check the bulk-sender requirements of the big mailbox providers.

  • SPF
  • DKIM
  • DMARC
  • BIMI
  • MTA-STS
  • TLS-RPT
  • SMTP test
  • Domain health

Reputation

Check an IP or domain against about 30 DNS blacklists at once and see which list flagged it.

  • Blacklist
  • Blocklist

Network and WHOIS

Registration and expiry dates, ASN ownership, reachability and HTTP checks. .tr domains are looked up through TRABIS.

  • WHOIS
  • ASN
  • Ping
  • Traceroute
  • TCP port
  • HTTP
  • HTTPS

SSL/TLS

Check a certificate's chain, expiry, OCSP and HSTS, or decode and convert certificates in your browser.

  • SSL checker
  • CSR generator
  • Decoder
  • Converter
  • OCSP
  • CT logs

Utilities

Watch a DNS change reach 20 public resolvers around the world, plus the small tools you need every week.

  • DNS propagation
  • Subnet calculator
  • Bulk lookup
  • Password generator
  • llms.txt
  • Robots.txt AI policy

And more

Email header analyzer, SPF and DMARC generators, DMARC report analyzer, bulk SSL checks and more.

See all tools
Uptime monitoring

Be the first to know when something goes down

A free DNSLab account watches your sites and services around the clock, alerts you when they fail and keeps your users informed with a status page.

Nine kinds of checks

HTTP(S), keyword, API, ping, TCP port, DNS, SSL certificate expiry, domain expiry, and heartbeat checks for cron jobs.

Alerts where you work

Email, webhooks, Slack, Discord and Telegram. Maintenance windows keep planned work from setting off alerts.

Status pages

Publish a page at status.dnslab.io with live status, incidents and 90 days of uptime history. Keep it public or protect it with a password, and let visitors subscribe to updates.

Free, Pro and Business plans: paid plans add more monitors, faster checks and longer history. Billing is coming soon.

Start monitoring for freeSee monitoring plans
For developers

Every tool is also an API

Use DNSLab from your scripts, monitoring jobs and AI assistants.

Free JSON API

Every DNS, email and network tool is a read-only JSON endpoint. No API key, no sign-up.

$ curl https://dnslab.io/api/lookup/mx/example.com
{
  "ok": true,
  "tool": "mx",
  "result": {
    "title": "MX records for example.com",
    "table": { "columns": […], "rows": […] },
    "checks": […]
  }
}
  • No API key
  • Read-only and live
  • CORS enabled
  • Rate-limited per IP
API documentation

MCP server for AI assistants

Add DNSLab as a remote MCP server in any AI assistant that supports MCP connectors. It can then answer DNS and email questions with live data and cite dnslab.io.

MCPhttps://dnslab.io/mcp

Streamable HTTP · No API key

For AI answer engines

llms.txt and llms-full.txt describe every tool and guide for language models.

llms.txtllms-full.txt

Turkish, end to end

Not just the menus: diagnostic results, guides and the glossary are in Turkish too, and .tr domains are looked up through TRABIS. Visitors from Türkiye see Turkish by default.

Guides and a glossary

Plain-language guides to SPF, DKIM, DMARC, DNS record types, deliverability and getting off a blacklist, plus a glossary of DNS and email terms.

Read the guides

Your data, plainly explained

Lookups need no account and the certificate tools never upload your keys. The privacy policy explains what DNSLab keeps, for how long and why.

Read the DNSLab privacy policy
Pricing

Free tools, simple monitoring plans

Every diagnostic tool is free, with no sign-up. Uptime monitoring starts with a free plan; Pro and Business plans add capacity.

DNSLab

Free

For everyone

Every tool, with no usage limits for normal interactive use.

Open DNSLab
  • All 50+ tools
  • Shareable result links
  • Free JSON API and MCP server
  • No sign-up

DNSLab is supported by unobtrusive ads, so every tool stays free.

See uptime monitoring plans

Frequently asked questions

Is DNSLab free?

Yes. Every diagnostic tool is free for normal interactive use, with no premium tier and no credit card; the tools are supported by unobtrusive ads. Uptime monitoring has a free plan too, and paid Pro and Business plans are on the way.

Do I need an account?

Not for the tools. Open a tool, run a query and read the result; whoever you share the link with can open it without signing up either. You only need a free account for uptime monitoring and status pages.

Are the results live?

Yes. Each lookup runs when you submit it, so recent DNS changes show up instead of an answer a resolver cached hours ago.

Is there an API?

Yes. Every tool is a free, read-only JSON endpoint with no API key, such as dnslab.io/api/lookup/mx/example.com. Requests are rate-limited per IP. AI assistants can also use DNSLab as a remote MCP server.

Which languages does DNSLab support?

English and Turkish, including the diagnostic results, guides and glossary. Visitors from Türkiye see Turkish by default, and you can switch at any time.

What does DNSLab keep about me?

The tools need no account. DNSLab keeps a record of each lookup, including your IP address but not the result, and access logs as Turkish law requires. The DNSLab privacy policy explains everything, including accounts, monitors and cookies.

How is DNSLab different from other DNS tools?

Every result is a shareable link, answers are queried live and there's no sign-up wall. DNSLab also works fully in Turkish and offers a free API and an MCP server.

Run your first lookup

No sign-up, nothing to install. Type a domain and see the answer in seconds.

Open DNSLab