- Single port: For example, -p 21
- The range of ports (from 1 to 1,000): For example, -p 1-1000
- A list of ports: For example, -p 21, 25, 80
- Popular ports: --top-ports [number] (for example, --top-ports 100 or --top-ports 1000)
- Scan fewer ports than the scanner default port numbers (fast mode): -F