// Utility
OSI Explorer
Enter a URL and press Run — the server performs a real connection and dissects it across the 7 layers of the OSI model (Open Systems Interconnection): DNS resolution, the TCP connection, the TLS handshake & certificate, and the application exchange. Works for HTTP(S), FTP, SMTP, IMAP, POP3, SSH and WebSocket — same lower layers, a different protocol on top.
real captured/negotiated live
reconstructed built from the real connection
illustrated not sniffable on a cloud VM
Runs server-side on chrome.net.ua · L1/L2 illustrated, L3–L7 from a real request · Back to portfolio