Port Selection

Control which ports to scan with flexible options

Overview

scan4all provides flexible port selection options, from scanning specific ports to using predefined port lists.

Default Behavior

Without any port specification, scan4all scans common HTTP ports:

scan4all -host 192.168.1.1

Default ports include:

• 80-99, 443, 888, 1025-1030, 2000, 2001, 2375, 2379
• 4433, 5000, 5001, 5432, 6379, 6443, 7000-7010
• 8000-8010, 8080-8100, 8443, 8888, 9000-9010, 9443
• And many more common web service ports

Specific Ports

Single Port

Scan a single port:

scan4all -host 192.168.1.1 -p 80

Multiple Ports

Scan specific ports separated by commas:

scan4all -host 192.168.1.1 -p 80,443,8080

Port Ranges

Scan a range of ports:

scan4all -host 192.168.1.1 -p 1-1000

Combined Syntax

Mix individual ports and ranges:

scan4all -host 192.168.1.1 -p 21,22,80,443,3000-4000,8080-8090

Top Ports

scan4all includes several predefined port lists based on Nmap’s research:

HTTP Ports (Default)

Common HTTP and web service ports:

scan4all -host 192.168.1.1 -tp http

Includes approximately 100 common web service ports.

Top 100

Nmap’s top 100 most common ports:

scan4all -host 192.168.1.1 -tp 100

Covers the most frequently used ports across all services.

Top 1000

Nmap’s top 1000 most common ports:

scan4all -host 192.168.1.1 -tp 1000

Comprehensive coverage of common services.

Full Port Scan

Scan all 65,535 TCP ports:

scan4all -host 192.168.1.1 -tp full

Full port scans take significantly longer and generate more network traffic.

Port Files

Specify ports from a file for complex or reusable configurations:

scan4all -host 192.168.1.1 -pf ports.txt

Port File Format

Create a file with one port or port range per line:

ports.txt

80
443
8000-8100
3000
3306
5432

You can also use comma-separated values:

ports.txt

21,22,23,25
80,443,8080,8443
3000-4000

Excluding Ports

Exclude Specific Ports

Scan a range but exclude specific ports:

scan4all -host 192.168.1.1 -p 1-1000 -ep 22,23,80

This scans ports 1-1000 except ports 22, 23, and 80.

Exclude from File

Exclude ports listed in a file:

scan4all -host 192.168.1.1 -tp 1000 -pf exclude.txt

Port exclusion is useful for:

• Avoiding honeypots or monitored services
• Skipping ports you’ve already tested
• Complying with security policies

All Ports Shorthand

Scan all 65,535 ports using the shorthand - syntax:

scan4all -host 192.168.1.1 -p -

This is equivalent to:

scan4all -host 192.168.1.1 -p 1-65535

CDN Port Optimization

When scanning domains that use CDNs, limit port scans to common HTTP ports:

scan4all -host example.com -ec

With -ec enabled:

• CDN IPs are detected automatically
• Only ports 80 and 443 are scanned on CDN hosts
• Reduces noise and improves scan efficiency

Practical Examples

1. Web Application Assessment

   Scan common web ports:

   scan4all -host example.com -p 80,443,8080,8443,3000,4000,5000
   
2. Database Service Discovery

   Scan common database ports:

   scan4all -host 192.168.1.1 -p 1433,3306,5432,5984,6379,27017
   
3. Quick Network Survey

   Use top 100 ports for fast reconnaissance:

   scan4all -host 192.168.1.0/24 -tp 100
   
4. Comprehensive Port Scan

   Full port scan with exclusions:

   scan4all -host 192.168.1.1 -tp full -ep 1-1023
   

   This scans all ports except well-known ports (1-1023).

Performance Considerations

Start Narrow

Begin with top 100 or specific ports, then expand if needed

Balance Speed vs Coverage

More ports = longer scan time. Choose based on your objectives

Use Rate Limiting

Adjust -rate for large port ranges to avoid network issues

Consider CDN Detection

Use -ec to optimize scans for CDN-protected targets

Port Selection Cheat Sheet

Goal	Command
Default HTTP ports	scan4all -host target
Specific ports	scan4all -host target -p 80,443
Port range	scan4all -host target -p 1-1000
Top 100 ports	scan4all -host target -tp 100
Top 1000 ports	scan4all -host target -tp 1000
All ports	scan4all -host target -p -
HTTP ports only	scan4all -host target -tp http
Exclude ports	scan4all -host target -p 1-100 -ep 22,23

Next Steps

Output Formats

Learn how to save scan results

Advanced Options

Explore advanced scanning features