Practice networking with interactive labs.
Unlocked tools are available now. Locked labs show what is planned next.
Available now
Binary Converter
Convert decimal octets into binary bits.
Subnet Visualizer
Split an IPv4 address into network and host bits.
TCP Socket Lab
Open a connection and inspect TCP flags, seq, and ack.
DNS Flow Visualizer
Follow a recursive lookup from browser to answer.
OSI Model Visualizer
Inspect layers and encapsulation from data to bits.
Routing Visualizer
Watch packets follow the lowest-cost path.
ARP Broadcast Lab
Broadcast a request and watch the LAN answer.
Protocol labs
NAT Translation Lab
Translate private source addresses live.
HTTP Request Lab
Open a request and inspect headers.
TLS Handshake Lab
Negotiate keys before encrypted HTTP.
DHCP Lease Lab
Request an address from a DHCP server.
ICMP Ping Lab
Send echo requests and inspect replies.
Coming soon
VLAN Lab
Split hosts into separate broadcast domains.
Packet Fragmentation Lab
Split packets when MTU is too small.
Wi-Fi Congestion Lab
Model airtime and channel contention.
Port Scanner Simulator
Probe services without touching real hosts.
Firewall Rules Lab
Allow and block traffic by rule.