;; status: NOERROR  ·  free · no sign-up · runs in your browser

Free DNS & Network Tools

Powerful, free tools for DNS lookup, nameserver checks, WHOIS, IP geolocation, SSL verification, and more.

Or jump toA · MX · TXTWHOISSSLBlacklist
$ dig +trace example.com NS
;; how a lookup walks the DNS tree
ROOT ZONE .
.518400NSa.root-servers.net.
TLD com.
com.172800NSa.gtld-servers.net.
AUTHORITATIVE example.com.
example.com.86400NSns1.dns-host.example.
example.com.86400NSns2.dns-host.example.
;; ANSWER — the domain is served by 2 nameservers. Same NS at registrar and zone = healthy delegation.
Illustrative example. Run a live check with the Nameserver Lookup.

;; tools section · 10 records

All Tools

Every lookup is free and needs no account. Results come straight from public DNS, RDAP and your own browser.

NSIN NS

Nameserver Lookup

Check NS records for any domain

Run check →
A · MX · TXTIN ANY*

DNS Lookup

Full DNS record lookup (A, AAAA, MX, TXT, CNAME, SOA)

Run check →
WHOISport 43

WHOIS Lookup

WHOIS domain registration information

Run check →
IPgeo

IP Lookup

IP address geolocation and details

Run check →
TLS:443

SSL Checker

Check SSL certificate details and validity

Run check →
HDRHTTP/1.1

HTTP Headers

View HTTP response headers for any URL

Run check →
TTFBms

Speed Test

Test website response time and performance

Run check →
RDAPavail

Domain Availability

Check if a domain name is available

Run check →
RBLDNSBL

Blacklist Checker

Check if IP/domain is on DNS blacklists

Run check →
MX@domain

Email Validator

Validate email addresses (syntax + MX check)

Run check →

;; workflow

01 · QUERY

Check the domain

Look up its nameservers, DNS records, WHOIS, SSL certificate or HTTP headers in one click.

02 · READ

Read the answer

Results show record types and TTLs the way a resolver returns them, so you see exactly what the internet sees.

03 · FIX

Fix it with a guide

Step-by-step guides cover nameserver changes, propagation, SPF/DKIM, DNSSEC and common DNS errors.

;; guides

Latest Posts

View all guides →
Three cards listing the apex and www DNS records for Vercel, Netlify and GitHub Pages above dig output that checks the apex A record, flags a leftover AAAA record and confirms the www CNAME
DNS Records

How to Point a Domain to Vercel, Netlify or GitHub Pages (A vs CNAME vs ALIAS)

The exact DNS records for Vercel, Netlify and GitHub Pages: an A or ALIAS record for the apex, a CNAME for www, the records to delete, and how to check it all with dig.

Oct 26, 20268 min read
Diagram linking a DKIM-Signature header with d=example.com and s=google to the DNS name google._domainkey and its TXT key, above dig output showing a found key, a revoked key with an empty p= value and a SendGrid CNAME
Email DNS

DKIM Record Lookup: Find Your Selector and Verify the Key

Find the DKIM selector in a message header, look up selector._domainkey with dig, nslookup or PowerShell, read the key tags, and fix the failures that break DKIM and DMARC.

Oct 25, 20269 min read
Diagram of a laptop asking its router for example.com and timing out, while the same lookup sent to 1.1.1.1 answers, above terminal checks for ping 1.1.1.1, nslookup example.com and nslookup example.com 1.1.1.1
Troubleshooting

DNS Server Not Responding: What It Means and How to Fix It

A six-step order of checks for the DNS server not responding error: prove it is DNS, find the resolver you use, test 1.1.1.1 and 8.8.8.8, then fix it on Windows, macOS, Linux or the router.

Oct 24, 20268 min read