* nmap port scanning commands 24 Feb 2026
@ 2026-02-24 5:48 Turritopsis Dohrnii Teo En Ming
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From: Turritopsis Dohrnii Teo En Ming @ 2026-02-24 5:48 UTC (permalink / raw)
To: Linux Networking; +Cc: ceo@teo-en-ming-corp.com
Subject: nmap port scanning commands 24 Feb 2026
Good day from Singapore,
[01] nmap command to scan all 65535 TCP ports
nmap -p- -sS -sV -O -T4 public_ip
What Each Option Does
-p- → Scan all 65,535 TCP ports
-sS → TCP SYN scan (standard for firewall auditing)
-sV → Service/version detection
-O → OS detection (helps verify what’s exposed externally)
-T4 → Faster timing, fine for Internet audit
[02] nmap command to scan all 65535 UDP ports
nmap -p- -sU -T4 target_ip
What Each Option Does
-p- → Scan all 65,535 UDP ports
-sU → UDP scan
-sV → Service/version detection on open UDP ports
-O → OS detection
-T4 → Faster timing
[03] nmap command to scan list and range of TCP ports
nmap -sS -sV -p 22,80,443,1000-2000 target_ip
[04] nmap command to scan list and range of UDP ports
nmap -sU -sV -p 53,123,500,1000-2000 target_ip
Regards,
Mr. Turritopsis Dohrnii Teo En Ming
Extremely Democratic People's Republic of Singapore
24 Feb 2026 Tuesday 1.48 pm Singapore Time
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