projectdiscovery/naabu
Naabu
Naabu is a port scanner library and tool that probes hosts for open ports using SYN, CONNECT, and UDP methods to identify active services. It functions as a Go library for embedding port scanning into programs, and as a standalone tool that accepts targets as hostnames, IP addresses, CIDR ranges, or ASN numbers. The tool discovers live hosts before scanning, filters ports by range or top lists, and can integrate with Nmap for service version detection.
The project distinguishes itself through its SYN-based port probing approach that sends TCP SYN packets and analyzes responses without completing the full handshake, enabling faster scans. It supports passive port enumeration through external services like Shodan InternetDB, and can exclude CDN or WAF IPs from full scans. Naabu also provides a REST API for programmatic scan triggering, configuration management, and result export, alongside the ability to embed port scanning directly into Go programs with callback-based result handling.
The tool covers host discovery, port scanning, and service detection across multiple input formats and output options. It includes features for filtering scan targets, rescanning completed scans, and exposing scan metrics via HTTP. The project is available as a command-line tool and as a Go library, with support for Docker deployment.