Interactive Tools · Mission Tech
Free interactive tools built around the courses. See the bits. Watch the packets. Touch the concepts instead of just reading about them.
Networking · IPv4
See the bits. Learn the math. Type any IP and prefix length and watch the binary representation update live - network bits, host bits, broadcast address, usable range. Subnetting stops being magic the moment you see it as just bits.
Open tool →Networking · OSI Model
Follow a packet from your browser to a server and back. Watch every header get added and stripped. See NAT rewrite your IP. Watch MAC addresses change at every hop while IP stays the same. 18 steps. Every one of them real.
Open tool →Networking · DNS
Follow a DNS query from your browser all the way to the authoritative name server and back. Watch the recursive resolver walk the full hierarchy - root, TLD, auth - step by step. Includes live DNS lookups via Google's public resolver.
Open tool →Networking · TCP
Watch the 3-way handshake form and tear down. Real sequence numbers. Every state transition. Then flip to chaos mode - drop a SYN and watch exponential backoff, trigger a server RST, or kill a live connection mid-flight.
Open tool →Networking · NAT
Watch how your router rewrites packets so many devices share one public IP. See the NAT table fill in live. Understand why inbound traffic gets blocked by default โ and how port forwarding punches through. Four scenarios, step by step.
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