Device42

Best Self Hosted Alternatives to Device42

A curated collection of the 3 best self hosted alternatives to Device42.

Device42 is a SaaS IT asset management and CMDB platform that auto-discovers hybrid infrastructure (servers, VMs, containers, network devices), maps dependencies and relationships, and provides inventory, IPAM, license tracking, and audit/change data.

Alternatives List

#1
Scanopy

Scanopy

Scanopy scans networks to discover hosts and services, then generates live, interactive topology diagrams and auto-updating network documentation.

Scanopy screenshot

Scanopy is a network discovery and documentation platform that scans your environment to identify hosts, services, and how they connect. It generates interactive topology diagrams that stay up to date through scheduled and distributed discovery.

Key Features

  • Automatic discovery of hosts, subnets, and service relationships
  • Interactive topology visualization with customization for clear network diagrams
  • 200+ built-in service definitions to identify common infrastructure and applications
  • Distributed scanning using deployable daemons across network segments and VLANs
  • Docker-aware discovery to map containerized services
  • Multi-user organization management with role-based permissions
  • Change tracking and versioning to compare network state over time
  • Export and sharing options for diagrams and live views

Use Cases

  • Homelab and multi-VLAN network documentation without manual diagram maintenance
  • IT and DevOps inventory and dependency mapping across servers and container stacks
  • Audit, compliance, and exposure reviews by visualizing reachable services and misconfigurations

Limitations and Considerations

  • Some features and collaboration workflows may be oriented toward organizational use (multi-user, roles), which can add complexity for very small setups

Scanopy is well-suited for teams and individuals who want continuously updated network diagrams and documentation generated from real discovery data. It reduces ongoing documentation effort while improving visibility into network topology and exposed services.

3.8kstars
179forks
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#2
portracker

portracker

Self-hosted tool that auto-discovers system and container ports, maps services in real time, and helps prevent port conflicts across servers via a web dashboard.

portracker is a self-hosted, real-time port monitoring and service discovery tool for mapping what is actually running on your servers. It scans the host and supported platforms (like Docker and TrueNAS) to provide an up-to-date view of services and their exposed ports, reducing errors from manual tracking.

Key Features

  • Automatic discovery of running services and their TCP ports on the host
  • Docker-aware discovery, including detection of internal container ports vs published host ports
  • TrueNAS collector with optional API key support for enhanced inventory details and VM/LXC visibility
  • Peer-to-peer monitoring to aggregate multiple portracker instances into a single dashboard
  • Hierarchical grouping to nest systems (for example, VMs under a physical host)
  • Lightweight deployment with an embedded SQLite database (no external DB required)
  • Modern responsive UI with live filtering, dark mode, and multiple layout views
  • Optional built-in authentication to restrict dashboard access

Use Cases

  • Maintain an accurate inventory of ports and services across homelab or small server fleets
  • Troubleshoot port conflicts and reduce deployment failures during container/app rollouts
  • Get a consolidated view of ports and services across multiple hosts via peering

Limitations and Considerations

  • Some discovery features require elevated container privileges (host PID and additional capabilities) to inspect system ports
  • TrueNAS VM discovery may be read-only unless a separate portracker instance runs on each VM

portracker is a practical choice for administrators who want continuous visibility into host and container networking without maintaining spreadsheets. Its embedded storage and peering model make it easy to deploy broadly and centralize service mapping.

1.5kstars
44forks
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#3
PortNote

PortNote

Self-hosted port inventory to document which services use which ports across servers and VMs, helping prevent conflicts and keep infrastructure organized.

PortNote is a self-hosted web application for tracking and documenting which network ports are in use across your servers and virtual machines. It centralizes port assignments and related notes so you can avoid conflicts and keep a clear overview of your infrastructure.

Key Features

  • Web UI to add servers/VMs and record port usage per system
  • Central dashboard view of your port landscape
  • Create and document port assignments to prevent collisions
  • Random port generator to help pick unused ports
  • Authentication via configurable login credentials

Use Cases

  • Maintain an internal registry of ports used by homelab or production services
  • Plan migrations and deployments without accidentally reusing ports
  • Audit and document service exposure and port allocations across hosts

Limitations and Considerations

  • Requires a PostgreSQL database backend
  • Designed for manual documentation rather than automatic network scanning

PortNote helps replace spreadsheets with a structured, searchable inventory of port assignments. It is a practical tool for teams and individuals who want clearer operational visibility and fewer port-related surprises.

1.2kstars
32forks
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Why choose an open source alternative?

  • •Data ownership: Keep your data on your own servers
  • •No vendor lock-in: Freedom to switch or modify at any time
  • •Cost savings: Reduce or eliminate subscription fees
  • •Transparency: Audit the code and know exactly what's running