Subject: nmap port scanning commands 3 Mar 2026 Tuesday 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- → 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 -vv 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 -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. ============================= nmap scan - Aggressive Mode ============================= [05] nmap command to ...