S-prt-X — fast port scanner written in Go

A lightweight port scanner with banner grabbing. Built for speed using goroutines.

• Go 1.21+

go build -o prt prt.go

./prt [flags]

# Scan top 1000 ports
./prt -h scanme.nmap.org

# Scan all ports
./prt -h scanme.nmap.org -aP

# Custom threads and timeout
./prt -h 192.168.1.1 -t 500 -timeout 3s

# Custom port list
./prt -h 192.168.1.1 -p myports.txt

[*] Scanning ports from top1000.txt on scanme.nmap.org
[*] Timeout: 2s, Threads: 300
[*] Starting scan...
[+] scanme.nmap.org:22/tcp open | "SSH-2.0-OpenSSH_6.6.1p1"
[+] scanme.nmap.org:80/tcp open
[*] Scan complete

• Banner grabbing works for services that send data on connect (SSH, FTP, SMTP, etc.)
• Higher -t values speed up the scan but may trigger rate limiting or IDS
• Port list file should have one port per line

Only use against systems you have permission to scan.