NMAP options

Description of allowed options.

• -sT - use TCP connect() method
• -sS - use SYN scan method
• -sU - UDP Scan
• -sV - probe open ports to determine service/version info
• -sA - use ACK-scan
• -sW - use TCP Window method
• -PS - TCP SYN discovery
• -Pn - skip host discovery phase, consider all targets as available for scanning (not recommended)
• -O - detect operating system of the target
• -F - fast mode (scan fewer ports than the default scan)
• -n - never do DNS resolution
• -R - always DNS resolve
• --top-ports - scan 1000 most commonly used ports