Protocol Explorer is a free interactive network simulator that shows how the internet really works. Watch HTTP, HTTPS, TCP, TLS, DNS and 35+ protocols in motion, with every packet decoded byte by byte.

Animated lessons are available in 8 languages, making it easy for students, developers and curious minds to follow DNS lookups, TCP handshakes and TLS negotiations step by step. No sign-up required – open the site and start exploring.

Try it free at Protocol Explorer.