Free tools for domains, email and web
Check DNS, SPF, DMARC, SSL and much more. Free, no login, no ads.
Domain and DNS
Who owns the domain, DNS records and propagation.
DNS lookup
View all DNS records for a domain: A, AAAA, CNAME, MX, NS, TXT, SOA and CAA.
Whois lookup
See who the registrar is for a domain, when it was registered, when it expires, and which name servers it uses.
Is the domain available?
Check whether a domain name is available and see at the same time if it is free on .se, .nu, .com and .eu.
DNS propagation
Check whether a changed DNS record has taken effect at Google, Cloudflare, Quad9 and AdGuard.
Reverse DNS (PTR)
Look up the hostname assigned to an IP address in reverse DNS, and check whether that hostname points back to the same address.
Punycode converter
Convert domain names with å, ä and ö to punycode (xn--) and back.
DNSSEC check
Check whether a domain has DNSSEC, and whether the signature is working.
MX, SPF, DKIM, DMARC and blacklists.
Email health check
A full health check for your domain's email: MX, SPF, DKIM, DMARC, MTA-STS and BIMI all at once.
MX lookup
See which servers receive email for a domain, in what order, and whether they are reachable.
SPF lookup
Test a domain's SPF record, count the DNS lookups, and see the full include chain.
DMARC lookup
Read and assess a domain's DMARC record: policy, reports, and how strictly checks are enforced.
DKIM lookup
Find a domain's DKIM key and check the key type and length.
Blacklist check
Check whether an IP address or a domain's email servers appear on known spam blacklists.
SPF generator
Build an SPF record for the services that send email on behalf of your domain.
DMARC generator
Create a DMARC record by choosing a policy and a reporting address.
Email header
Paste an email header to see the path the message took, any delays, and the results for SPF, DKIM, and DMARC.
Website
Is the site up, certificates, redirects and SEO.
Is the site down?
Check whether a website is up or down, including status code, response time and IP address.
HTTP headers
View all response headers sent by a web server, for every step in the redirect chain.
Security headers
Rate your website's security headers from A to F, with an explanation and suggestion for each header.
Redirect checker
Follow an address step by step and see each redirect, with status code and time.
SSL check
Check a domain's SSL certificate: issuer, validity period, names, chain and TLS version.
Which web host?
Find out which web host a website is likely using, and who manages its DNS and email.
Robots.txt test
View a website's robots.txt and test whether a path is allowed for Googlebot, Bingbot, or GPTBot.
Sitemap check
Find and check a website's sitemap: number of URLs, sitemap index, and common errors.
SERP preview
See how your page title and meta description appear in Google search results, on desktop and mobile.
.htaccess generator
Create an .htaccess file with https, www, 301 redirects, custom error pages, file protection, and caching.
Speed test
How fast is your website? Measure response time and find out what is slowing your page down.
IP and network
Your IP address, reverse DNS lookup, and ping.
What is my IP address?
See your public IP address instantly — whether it is IPv4 or IPv6 and which provider it belongs to.
IP address lookup
Look up an IP address or domain name: who owns the network, country, hostname, and address range.
Ping: is the server reachable?
Test whether a server responds on a given port, and how quickly, with four connection attempts.
Password
Strong passwords for email, FTP, and the control panel.
Images
Reduce image sizes to make your site load faster.