Free company, domain, email and IP checks
Each tool answers one question, without an account, with 20 free checks per tool per day. Each page explains where the result stops being reliable. The same checks run through the API with one key.
Email infrastructure
Can this domain send and receive mail properly, and is this address real?
Disposable email checker
Find out whether an address comes from a throwaway inbox before you send it a trial, a coupon or an invoice.
MX lookup
List the mail servers that receive email for a domain, in the order senders try them, and see who runs them.
Email validator
Check an address before you rely on it: syntax, the domain's mail setup, throwaway and role addresses, likely typos — with every reason shown.
Email finder
Give a name and a company website. Get the likeliest work address, the format it follows and how sure we are.
Email format finder
Give a company's website. See how it formats its people's email addresses.
SPF checker
Read a domain's SPF record the way a receiving mail server does, and see what would make it fail.
DMARC checker
See whether a domain tells receivers what to do with mail that fakes its name — and how strictly.
DKIM checker
Look up a domain's DKIM key for a given selector and check that it is published correctly.
Domain and website
Is the domain established, configured and technically credible?
Domain age checker
See when a domain was first registered, when it expires and whether it is brand new.
Website technology checker
See what a website is built with — and the evidence behind each detection, so you can judge it yourself.
DNS health check
Run the basic DNS checks on a domain and see each one as passed, missing, misconfigured or not tested.
SSL certificate checker
See when a site's certificate expires, who issued it and whether it covers the name you typed.
Redirect checker
Follow a link hop by hop and see every redirect, its status code and where it finally lands.
Security headers checker
See which HTTP security headers a site sends, which are missing, and what each one protects against.
Robots.txt checker
Read a site's robots.txt and see which crawlers may visit which paths.
Sitemap checker
Find a site's XML sitemap, check that it parses and see how many pages it lists.
IP and network
Who operates the network, and what does the address say about the visitor?
IP lookup
See who operates an IP address, roughly where it is, and whether it is a VPN, Tor, relay or data-centre address.
ASN lookup
Find the autonomous system — the network — that routes an IP address, with its operator name and address block.
Bulk IP lookup
Paste a list of IP addresses and get network, country and risk flags for all of them in one table.
Phone
Is the number real, what kind of line is it, and do people report it?
Company identity
Does the business exist, is it active, and does the website belong to it?
Company search
Find a registered company by name or registration number, and see whether it is active.
Company directors
Give a company number or name. See who runs it: directors, executives, board, owners and auditors, with their roles and dates.
VAT number checker
Check that a VAT number is valid and registered before you invoice without VAT.
Company website profile
Give a company's website. Get what the company says about itself — contacts, profiles, company numbers and technology — in one view.
Hiring checker
Give a company's website. See whether it is hiring, how much, where and in which teams.
Company reality check
Give a company's name, website and country. Get the evidence that it exists and that the website is its own — in one view.
New companies this week
Every week thousands of companies are formed. See this week's, by country and sector.