What is inoue?

Inoue is a command line tool for figuring out what software and services a website is built on. Point it at a domain or a URL and it inspects HTTP headers, cookies, the page's HTML, script tags, meta tags, and common URL paths to guess which web server, programming language, framework, content management system, analytics tool, payment provider, or admin panel is in use. The project describes its catalog as covering more than 600 different services, from ordinary things like WordPress or Nginx to more specialized targets such as cloud consoles, VPN portals, industrial control interfaces, and internet connected devices with their own web interface. It is aimed at people doing security reconnaissance, bug bounty work, capture the flag competitions, or general review of what is exposed on a network. Beyond basic fingerprinting, Inoue can optionally inspect SSL and TLS certificates, look up DNS records such as A, MX, NS, TXT, and CNAME, and check whether common security headers like HSTS or a content security policy are present. It can scan several targets at the same time using multiple worker threads, and results can be printed to the terminal with color and confidence levels, or saved as structured JSON for other tools to consume. Installing it means cloning the repository and installing its Python dependencies with pip. Running a scan is a single command against a hostname, with flags to turn on verbose output, show the evidence behind each detection, skip DNS or SSL checks, or use presets like a fast scan or a full reconnaissance scan. The project also documents how to add new detection signatures yourself, by editing a Python file that maps a technology name to the headers, cookies, HTML patterns, or paths that identify it. The tool is released under the MIT license.