Port & Service Discovery

How to find open ports and services

NMAP

The best method to find open ports and services remains to be NMAP.

Quick Discovery Scan

This scan will only look for common TCP/UDP ports and uses a faster ping scan method.

nmap -sn -T4 -PE -PM -PP -PU53,69,161,500,514,520,1434 -PA21,22,23,25,53,80,443,513,8080,3389 -PS21,22,23,25,53,80,443,513,8080,3389 -n -r -vv -oA discovery -iL ipfile.txt

This scan will perform a thorough assessment and attempt to find any and all ports.

Longer Full Scan

nmap -sT -n -Pn -p- -T3 --randomize-hosts --min-hostgroup 96 --max-retries 3 --min-parallelism 64 --max-scan-delay=5s --open -oA Full-TCP-Scan -iL ip-list.txt -vvv

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