nmap port scanning commands 25 Feb 2026 Wednesday

Subject: nmap port scanning commands 25 Feb 2026 Wednesday

Good day from Singapore,

[01] nmap command to scan all 65535 TCP ports

nmap -p- -sS -sV -O -T4 -vv public_ip

What Each Option Does

-p- =E2=86=92 Scan all 65,535 TCP ports

-sS =E2=86=92 TCP SYN scan (standard for firewall auditing)

-sV =E2=86=92 Service/version detection

-O =E2=86=92 OS detection (helps verify what=E2=80=99s exposed externally)

-T4 =E2=86=92 Faster timing, fine for Internet audit

[02] nmap command to scan all 65535 UDP ports

nmap -p- -sU -T4 -vv target_ip

What Each Option Does

-p- =E2=86=92 Scan all 65,535 UDP ports

-sU =E2=86=92 UDP scan

-sV =E2=86=92 Service/version detection on open UDP ports

-O =E2=86=92 OS detection

-T4 =E2=86=92 Faster timing

[03] nmap command to scan list and range of TCP ports

nmap -sS -sV -p 22,80,443,1000-2000 -vv target_ip

[04] nmap command to scan list and range of UDP ports

nmap -sU -sV -p 53,123,500,1000-2000 -vv target_ip

Please remember to use Verbose Mode -vv.

Regards,

Mr. Turritopsis Dohrnii Teo En Ming
Extremely Democratic People's Republic of Singapore
25 Feb 2026 Wednesday 10.11 am Singapore Time