Domain Locker is an open-source domain management and monitoring platform designed to help users track and organize domain portfolios across multiple registrars from a single dashboard. It automatically aggregates public domain data such as registrars, DNS records, SSL certificates, hosts, IPs, and subdomains, providing a centralized view of all domain-related assets.

The platform is built to solve the common problem of managing domains scattered across different providers and spreadsheets. Once a domain is added, Domain Locker automatically fetches and updates its associated metadata in the background using publicly available read-only data, without requiring any changes to the domain configuration.

It provides real-time monitoring and analytics features, including uptime tracking, DNS and security change detection, and visual dashboards for portfolio insights. Users can also track domain expirations, renewal timelines, and configuration changes through detailed audit logs and alerting systems.

A key aspect of Domain Locker is its focus on automation and observability. It continuously monitors domain health, security posture, and infrastructure changes, sending notifications through channels like email, webhooks, Telegram, or other integrations when changes occur or expirations approach.

The platform also includes tools for valuation tracking, tagging, categorization, and cost management, allowing users to maintain a structured overview of domain investments and usage across projects. It supports data export and API access, making it suitable for both individual users and technical teams.

Domain Locker is fully open source and self-hostable, with deployment options including Docker, Kubernetes, and other infrastructure environments. It is designed to give users full control over their data while offering a modern UI for domain intelligence and portfolio management.

Key features include:

• Centralized dashboard for all domains across registrars
• Automatic fetching of DNS, SSL, WHOIS, and hosting data
• Domain expiry tracking with smart renewal alerts
• Security monitoring and change detection
• Uptime and performance monitoring
• Visual analytics and portfolio statistics
• API, RSS, Prometheus, and export support
• Open-source and self-hostable architecture
• Tags, categorization, and valuation tracking

Common use cases include:

• Managing multiple domain portfolios
• Tracking renewals and expirations
• Monitoring DNS and security changes
• Observing uptime and infrastructure health
• Organizing domains across different registrars or projects

Domain Locker is developed as an open-source project (MIT licensed) by Alicia Sykes and contributors, positioned as a comprehensive observability and management layer for domain infrastructure.