Network toolbox

Codynet is a diagnostic toolbox for the public side of the internet. When a domain resolves one way on your laptop and another way for a customer three time zones over, the cause is usually invisible from a single machine — a stale local DNS cache, an ISP resolver still serving old records, split-horizon routing, or a certificate that only fails from certain networks. These tools give network engineers, sysadmins, and web developers a clean, deterministic view of how public authoritative sources actually answer, independent of whatever your own network happens to be doing.

Every lookup runs server-side against the real authoritative source — DNS resolvers, RDAP registries, and live TLS and HTTP endpoints — so the results reflect the public internet rather than your local cache or corporate proxy. You can confirm whether a DNS change has propagated across Cloudflare, Google, and Quad9 with the multi-resolver compare tool, review a site's HTTP security headers, inspect a full TLS certificate chain before it expires, or run any lookup across a whole list of domains and IPs at once. Queries are processed in real time and are never retained or logged.