Comprehensive on-demand OSINT to analyze a website's security, architecture, and tech stack.
34.7k stars2.8k forksMITlast commit Actively maintained
2 self-hosted PortCheckTool.com alternatives
Web-based utility that tests whether a specified TCP or UDP port on a public IP is reachable from the internet. It attempts connections and reports open/closed/filtered status to help diagnose firewall, NAT, ISP and port-forwarding connectivity issues.
Alternatives to PortCheckTool.com
Open-source API and web interface to test TCP port availability for hostnames and IPs. Docker-ready, minimal dependencies, and exposes Prometheus metrics for monitoring.
195 stars8 forksGPL-3.0last commit Actively maintained
What replacing PortCheckTool.com actually involves
Every option on this page is open source and free to run on your own hardware, so you own the data and there is no subscription to cancel. 2 of 2 shipped a commit in the last six months. Licences in this list: MIT, GPL-3.0. In exchange you take on hosting, backups and updates yourself.
Browse everything in Monitoring & Observability.
