Default vs Full Port Scans
By default nmap only scans the 1000 most common ports. Many services run on non-standard ports to avoid detection.
A full port scan checks all 65535 ports:
nmap -p- TARGET
This takes longer but finds everything.
Service Version Detection
Once you find open ports, identify exactly what is running:
nmap -sV -p 22,80,3000 TARGET
Your Mission
The target is running a service on a non-standard port above 3000. Find it.
Run a full scan, identify the non-standard port, and connect to it with curl to retrieve the flag.
Tip
nmap -p- --min-rate 1000 15.204.80.238