About us

We show an IP address's location, provider, blocklist status, VPN and proxy signals and WHOIS record, and a domain's DNS records, email security, DNSSEC chain, nameserver health and SSL status, all in one report. We brought together checks that used to live on separate sites and added a fix suggestion to every finding.

• We ask the source directly. DNS records come from the domain's authoritative servers and blocklist results from each list's own servers; stale cached answers never decide the result.
• We state status clearly. No result is conveyed by color alone; every check has a written label and an explanation.
• We do not hide the method. Scores and checks are explained in the guide, and where detection is heuristic the report says so.
• We respect privacy. Visitor IP addresses are not stored in raw form; details are in the privacy policy.

System administrators, teams investigating email delivery problems, security analysts and anyone who wants to keep an eye on their own domain's health. It can be used from the browser, from the terminal (curl) or through the API.

The sources we use and their attributions are listed on the terms of use page.

Use the contact page for questions, feedback and bug reports.