portmap

Port Scanner - lists all listening ports with process information.

Purpose

Display all TCP and UDP ports in use on the system along with associated process details.

Installation

go build -o portmap ./cmd/portmap

Usage

portmap

Examples

# List all listening ports
portmap

# Combined with other tools
portmap | grep 8080  # Find port 8080

Output

=== PORT MAP ===

8080   tcp    0.0.0.0:8080      node
    PID: 12345 | node server.js

3306   tcp    127.0.0.1:3306      mysqld
    PID: 23456 | /usr/sbin/mysqld

22     tcp    0.0.0.0:22        sshd
    PID: 1111 | /usr/sbin/sshd -D

Port Color Coding

• Red: Well-known ports (<1024)
• Yellow: Registered ports (1024-7999)
• Green: Dynamic/private ports (8000+)

Dependencies

• Go 1.21+
• github.com/fatih/color
• ss (from iproute2 package)
• lsof
• ps

Build and Run

# Build
go build -o portmap ./cmd/portmap

# Run
go run ./cmd/portmap

Useful Commands

lsof -i :<port>     # Find process using specific port
kill <pid>          # Kill process by PID
ss -tuln            # List all listening ports

License

MIT