tools
Network and email tools. Every tool is a page and a JSON API, in one Cloudflare Worker, built with Void on the web platform. How it's built
DNS & domains
- DNS discoveryScan a domain's apex records, email setup and subdomains in one go, with names from Certificate Transparency logs.
- DNS lookupLook up A, AAAA, MX, TXT and other records over DNS-over-HTTPS, with DNSSEC validation.
- RDAP lookupRegistration data for a domain over RDAP, the successor to WHOIS: registrar, dates, status, nameservers, DNSSEC.
- DMARC validatorFetch a domain's DMARC record, explain every tag and flag common mistakes.
- SMTP submission testConnect to a mail server's submission port and check its banner, STARTTLS and login options.
- SPF validatorWalk a domain's SPF record and every include, and count the 10-lookup budget.
Network
- Browser infoWhat a server sees of your request: headers, Client Hints, location, TLS and your IP with its reverse DNS.
- Cloudflare edgeWhich Cloudflare data center serves you, where it is and how far away. Or look up any colo code.
- IP infoYour IP address and where it is: city, country, timezone and network, from Cloudflare's request data.
- IPv6 utilsExpand and compress an IPv6 address, find its network for a prefix length, and check it against a CIDR range.
Web
- External link scannerCrawl a site and list every external link, script, iframe and form target by domain, with likely spam flagged.