About
About Codynet
What this is
Codynet is a free network toolbox: DNS, RDAP, HTTP headers, TLS certificates, subnet math, multi-resolver compare, and bulk lookups. No accounts. No paywall. No upsell.
Who built it
Codynet is built and maintained by Cody Li, that’s me. I’m a data scientist who works in security, based in Bellevue, WA. I built Codynet because I kept needing quick, trustworthy answers from DNS, RDAP, and TLS while working on data and infrastructure problems, and the existing lookup sites were slow, buried the answer under ads, or quietly logged every query. Codynet is the tool I wanted for myself: fast, private, and honest about exactly what the protocol said.
Codynet is an independent personal project. It is not affiliated with, sponsored by, or operated on behalf of any employer or organization.
Why it exists
Codynet talks to each protocol directly: DNS straight to a resolver, RDAP straight to the registry, and TLS straight to the server you ask about. No middleman wrapping public protocols in a proprietary API, and no rebranded data: just the answer the protocol actually returned.
Privacy by structure
- Determinism over decoration. Show the protocol’s real answer, with the real flags, TTLs, and error codes. If the resolver said
SERVFAIL, that’s what you see. - No query retention. Your lookup history lives in your browser, not on our server. Server logs never contain query content. Ads, where shown, do not receive your queries.
- No vendor lock-in. Every result panel includes the equivalent
digorcurlcommand so you can verify the answer outside our site.
Get in touch
If you find a bug in any of my tools or have an idea for a new feature, please email me. I don’t have a contact form yet, so you’ll find my email address and reporting tips on the contact page. Thank you!
Find Codynet on X, GitHub, and LinkedIn.
Last reviewed July 2026.