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Subnetting speed arena
Calculate fast. Understand why. Beat your best time.
NETWORK LAB / GAME MODE
IPV4 CALCULATOR // READY
Can you subnet under pressure?
BEST --
SCORE 0
Try any IPv4 CIDR, including /31 and /32.
TIMED CHALLENGE
00:00.0
Start a challenge to race against the clock.
LIVE BREAKDOWN
192.168.10.0/24
NETWORK--
BROADCAST--
USABLE HOSTS--
ADDRESS COUNT--
32-BIT ADDRESS MAPMASK --
NETWORK BITSHOST BITS
Enter a CIDR block to see the network math.
The broken server challenge
Read the clues. Run the right checks. Restore the service.
SERVER ROOM / INCIDENT MODE
INCIDENT SIMULATOR // DEGRADED
Loading incident...
DIAGNOSIS 0
CASE 1/3
INCIDENT CLUES
OBJECTIVE
Choose the checks that prove the root cause, select your diagnosis, then apply the fix.
Select a diagnostic command to inspect its output.
ROOT CAUSE ANALYSIS
0/2 checks
TCP/IP packet journey
Send a request and watch every layer make the trip.
NETWORK LAB / PACKET TRACE
PACKET TRACE // STANDBY
From URL to response
CLIENT10.0.0.24
SERVER20.42.18.7
Select a stage or send a packet to inspect the trace.
Interactive infrastructure map
Trace a request from the public internet to the service on the VM.
AZURE LAB / ARCHITECTURE TRACE
REQUEST PATH // ONLINE
How the lab protects the web server
PUBLIC TRAFFIC
Select a node to inspect its role, ports, and security boundary.