nmap port scanning commands 24 Feb 2026

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

REFERENCES

=============

[1] https://lore.kernel.org/netdev/VjZr3xTDnBNHKNkguI2aqodaIwdUBSrREdUYlDJv_tYkFkDytkaKQjpPQPrIf6PsE5QTJMFqug6uIfV5pBwsRD7-UvFybNopn2Q7HjFXoUg=@protonmail.com/

[2] mail-archive.com - NIL

[3] https://marc.info/?l=linux-netdev&m=177191485412616&w=2

[4] https://lists.freebsd.org/archives/freebsd-chat/2026-February/000067.html

[5] mail-archive.com - NIL

[6] https://marc.info/?l=freebsd-chat&m=177192783021301&w=2