Free domain tools
Practical, no-signup tools for researching domains — the same data we use inside DomainInventory.
DNS & Email
DNS Lookup
Look up the DNS records of any domain — addresses, mail servers, nameservers, TXT verification records and more.
Open toolReverse DNS Lookup
Find the hostname behind an IP address via its PTR record, and resolve a hostname back to its IPs.
Open toolReverse IP Checker
Find the other websites sharing a server — enter an IP or domain and see every other domain hosted on the same IP address.
Open toolDNS Propagation Checker
Check a DNS record against multiple public resolvers worldwide to see whether a change has propagated everywhere.
Open toolEmail Security Checker
Audit a domain’s email setup: mail servers, SPF policy and lookup count, DMARC policy and DKIM selectors — with a deliverability grade.
Open toolDNSSEC Checker
Check whether a domain is protected by DNSSEC and whether the signature chain validates.
Open toolIP Geolocation
Look up the approximate location, ISP and network of any IPv4 or IPv6 address, or of a domain’s server.
Open toolWebsite Hosting IP Checker
Find where a website is hosted — its server IP addresses, hosting provider or ISP, data-center location, reverse DNS and any CDN in front of it.
Open toolWHOIS & Ownership
WHOIS Lookup
Full registration record for any domain via RDAP with WHOIS fallback — registrar, creation and expiry dates, nameservers and status codes.
Open toolDomain Age Checker
See when a domain was first registered and exactly how old it is — a key signal of a domain’s value.
Open toolDomain Expiry Checker
Check when any domain expires and how many days are left — spot dropping domains and renewal deadlines.
Open toolWHOIS History Checker
Trace a domain’s history — how its nameservers, registrar and ownership have changed over the years, plus a certificate-based infrastructure timeline.
Open toolBulk WHOIS Checker
Paste up to 50 domains and get registrar, creation date, expiry date and status for each in one table.
Open toolEPP Status Code Decoder
Paste EPP/ICANN status codes like clientTransferProhibited and get a clear explanation of what each one means.
Open toolAvailability & Names
TLD Availability Checker
Check a name across popular TLDs at once — see which extensions are taken and which look available, with prices.
Open toolBulk Availability Checker
Paste a list of domains and instantly see which are registered and which look available to hand-register.
Open toolDomain Name Generator
Turn a keyword into dozens of domain ideas with common prefixes and suffixes, and see which are available.
Open toolTypo / Typosquat Finder
Generate common typos of your domain and see which are registered — essential for brand-protection.
Open toolIDN / Punycode Converter
Convert internationalized domain names between their Unicode form (münchen.de) and punycode (xn--mnchen-3ya.de).
Open toolWebsite Analysis
Website History Checker
See how far back a website goes — first and latest snapshots, captures per year and direct links to the Wayback Machine.
Open toolHTTP Headers Viewer
Fetch the HTTP response headers and status of any URL — server, caching, security headers and more.
Open toolRedirect Checker
Trace the full chain of redirects from a URL to its final destination, with the status code at each hop.
Open toolMeta Tag & Open Graph Analyzer
Inspect a page’s title, meta description and Open Graph tags, and preview how it looks shared on social media.
Open toolWebsite Technology Detector
Detect the technologies a website runs — CMS, JavaScript frameworks, analytics and hosting signals.
Open toolParked Domain Detector
Check whether a domain shows a real website or a parking lander, and which parking provider it uses.
Open toolSecurity & Trust
SSL/TLS Check
Inspect the SSL certificate of any website — issuer, validity window, days until expiry, covered hostnames and TLS version.
Open toolCertificate Transparency History
List every SSL certificate ever issued for a domain from public Certificate Transparency logs.
Open toolSubdomain Finder
Find the subdomains of a domain using public Certificate Transparency logs — no scanning required.
Open toolDNSBL Blacklist Checker
Check whether a domain’s mail server IP is listed on major DNS blacklists like Spamhaus and SORBS.
Open toolInvestor Utilities
Domain Price Checker
Check what a domain costs to register, renew and transfer at live registrar rates.
Open toolBulk Domain Price Checker
Paste a list of domains and get registration, renewal and transfer prices for every one of them.
Open toolTLD Price Comparison
Browse and sort live registration, renewal and transfer prices across hundreds of TLDs.
Open toolDomain ROI Calculator
Enter purchase price, holding years, renewal cost and sale price to see your net profit, ROI and annualized return.
Open toolEscrow Fee Calculator
Estimate the fees on a domain sale across popular escrow and marketplace services, and what you net.
Open toolDomain List Cleaner
Paste a messy list of domains — strip URLs, www and duplicates, normalize case, and export a clean sorted list.
Open toolDomain List Comparator
Compare two domain lists and see what’s only in the first, only in the second, and in both.
Open toolDomain Portfolio Analyzer
Paste a portfolio list and get a breakdown of lengths, TLD mix, hyphens, numbers and other patterns.
Open tool