NetDisco is built for network teams that want free, open-source Layer 2 topology discovery and device tracking. Its main limitation: perl-based, which limits the contributor pool. These are the best NetDisco alternatives for network discovery, topology visualization, and living documentation, starting with the one we build, Scanopy.
The best NetDisco alternatives
Scanopy Our pick
A dedicated network documentation tool: one scan produces four switchable views (L2 physical, L3 logical, workloads, and applications) plus per-host service detection, at flat pricing regardless of host count, with a free, self-hostable Community edition.
LibreNMS
LibreNMS is for teams with Linux skills that want free, self-hosted monitoring with basic topology visualization.
Scanopy vs LibreNMS, head to head →Auvik
Auvik is for MSPs who need monitoring, alerting, and network maps in one cloud-managed platform.
Scanopy vs Auvik, head to head →NetBrain
NetBrain is for large enterprises that need network maps integrated with automation and troubleshooting workflows.
Scanopy vs NetBrain, head to head →SolarWinds Network Topology Mapper is for enterprise teams that standardize on Microsoft tools and need Visio-native network diagram exports.
Scanopy vs SolarWinds Network Topology Mapper, head to head →Domotz
Domotz is for cost-conscious MSPs who need monitoring, remote access, and basic network maps at a transparent price.
Scanopy vs Domotz, head to head →ManageEngine OpManager is for mid-market IT teams that want monitoring and visualization at a lower per-device cost.
Scanopy vs ManageEngine OpManager, head to head →PRTG Network Monitor is for teams already invested in the Paessler ecosystem who want built-in topology mapping alongside monitoring.
Scanopy vs PRTG Network Monitor, head to head →Faddom
Faddom is for enterprise IT teams mapping application dependencies for data center migrations and cloud transitions.
Scanopy vs Faddom, head to head →NetBox
NetBox is for network and automation teams building a structured source of truth to drive Ansible, Nornir, or Terraform.
Scanopy vs NetBox, head to head →NetDisco alternatives compared
How NetDisco and each alternative compare on discovery, the four topology views (L2, L3, workloads, applications), service detection, pricing, and licensing.
| ToolProduct name and link to vendor site | DiscoveryProtocols used to find devices and map connections | Network ViewsWhich topology views the tool produces from discovery. L2 Physical switch ports and links L3 Subnets, VLANs, routing Workload VM/container host nesting Application Service-dependency / app grouping Yes supported Tag ? unverified Greyed not supported | ServicesNo No service awareness Basic Common port detection Yes Application-level fingerprinting | PricingStarting price or pricing model | Open SourceOSI OSI-approved open source license Source available Source code available, restricted license No Proprietary |
|---|---|---|---|---|---|
| NetDisco | SNMP CDP LLDP ARP [12] | No | Free | OSI BSD | |
| Scanopy | SNMP LLDP CDP ARP TCP/UDP | Yes240+ types | Starts at $11.99 monthly, unlimited hosts | OSI AGPL-3.0 | |
| LibreNMS | SNMP CDP LLDP [10] | No | Free | OSI GPL-3.0 | |
| Auvik | SNMP CDP LLDP ARP [1] | Basic [2] | Per-device (contact sales) | No | |
| NetBrain | SNMP CDP LLDP ARP SSH/CLI | No | Enterprise (contact sales) | No | |
| SolarWinds NTM | SNMP WMI CDP LLDP ICMP [3] | No | Perpetual ~$1,570 (subscription shift unclear) [44] | No | |
| Domotz | SNMP ARP ICMP CDP LLDP mDNS NetBIOS [5] | Basic [6] | $1.50/device/mo [7] | No | |
| ManageEngine OpManager | SNMP CDP LLDP ARP [8] | No | From $95/yr (10 devices) [9] | No | |
| PRTG | SNMP WMI ICMP [13] | No | Free up to 100 sensors then tiered [4] | No | |
| Faddom | NetFlow/sFlow [23] | Basicapp dependencies [23] | Free up to 50 servers then from $19,000/yr [24] | No | |
| NetBox | ICMP SNMP SSH/CLI | No | Cloud and Enterprise: contact sales [42] | OSI Apache-2.0 |
Why Scanopy is a strong NetDisco alternative
NetDisco and Scanopy both discover devices over SNMP and read CDP/LLDP neighbor data, and both are open source. NetDisco focuses on Layer 2: it collects IP and MAC data into PostgreSQL and answers "what device is on which switch port?" — search a MAC or IP and it shows the exact switch and port, which makes it a long-running favorite for tracking down endpoints and auditing port usage. Scanopy does that same Layer 2 work — switch, port, and MAC/IP visualization — from a single scan, and adds three more views (L3, workloads, applications) plus per-host service fingerprinting on top.
The real difference is scope and setup, not Layer 2 capability. NetDisco is free (BSD-licensed) but it's Perl and PostgreSQL on Linux, and it's Layer 1/2 only — no L3 routing or subnet mapping. Scanopy is flat monthly with unlimited hosts, commercially self-hostable, or free under AGPL-3.0, runs from one daemon, and covers L3, workloads, and applications alongside the same switch-port and MAC/IP data. If switch-port and MAC tracking is all you need and you're happy administering Perl and Postgres, NetDisco does it well. If you want that Layer 2 visibility plus L3, workload, and application views in one tool you don't have to hand-assemble, Scanopy is the broader fit.
On Layer 2 itself the two land in the same place — switch, port, MAC, IP. What you're really choosing is whether you also want L3, workloads, and applications in the same map (Scanopy), or a focused, free, self-hosted Layer 2 tool you run entirely yourself (NetDisco), which has done that one job well since 2003.
Frequently asked questions
What is the best alternative to NetDisco?
It depends on what you rely on NetDisco for. If you want automatic network discovery with living L2, L3, workload, and application views and per-host service detection, Scanopy is the closest dedicated alternative — flat pricing regardless of host count, plus a free, self-hostable Community edition. NetDisco itself remains the better choice when you specifically need network teams that want free, open-source Layer 2 topology discovery and device tracking.
Is there a free or open-source NetDisco alternative?
Yes. Scanopy, LibreNMS, and NetBox are open-source (OSI-licensed). Scanopy's Community edition is free to self-host under AGPL-3.0 and produces the full L2, L3, workload, and application views; the paid plans add cloud hosting and support at flat pricing.
Why do teams look for a NetDisco alternative?
The most common reason: perl-based, which limits the contributor pool. Teams that need an up-to-date visual map of what is actually on the network — without standing up additional tooling — tend to compare dedicated documentation tools like Scanopy alongside NetDisco.
Comparing just these two? See the focused Scanopy vs NetDisco head-to-head. For all 13 tools side by side, see the full comparison of automated network diagram tools.
Sources
[2] Auvik - Can Auvik discover services on my network?
[3] SolarWinds - Network Topology Mapper
[4] Paessler - PRTG Pricing
[5] Domotz - Agentless Network Discovery for MSP Client Onboarding
[6] Domotz - Device TCP/UDP Ports/Services Discovery
[7] Domotz - Pricing
[8] ManageEngine - Discover Networks
[9] ManageEngine - OpManager Editions
[10] LibreNMS - Auto-Discovery
[12] NetDisco - Documentation
[13] Paessler - PRTG System Requirements
[23] Faddom - Agentless Application Dependency Mapping
[24] Faddom - Pricing
[42] NetBox Labs - Pricing (Cloud and Enterprise contact sales)
[44] SolarWinds NTM - Pricing (TrustRadius)
Try Scanopy
Scanopy deploys a lightweight daemon that discovers your network and builds a live topology map. No per-device fees, unlimited hosts. It pairs with whatever monitoring tool you already use.
Started as a homelabber, now deep in SNMP MIBs, Layer 3 topology, and service fingerprinting - building the network documentation tool I wished existed.