Nagios
Nagios Enterprises provides open-source and commercial IT infrastructure monitoring software, offering Nagios Core (free), Nagios XI, Log Server, Network Analyzer, and Fusion to IT operations teams, enterprises, hosting providers, and MSPs via a plugin-based architecture.
- Company typePrivate
- Founded1999
- HeadquartersSaint Paul, United States
- Headcount11–50
- GTM typeB2B
- OfferingSoftware
What Nagios does
Nagios Enterprises, LLC is a privately held IT infrastructure monitoring software company headquartered in St. Paul, Minnesota, founded in 2007 by Ethan Galstad around an open-source project originally released in 1999 (initially as NetSaint, renamed Nagios in 2002). The company's core product, Nagios Core, is a free, open-source monitoring engine that uses a plugin-based architecture to monitor websites, servers, switches, routers, firewalls, ports, applications, and metrics, and has been downloaded over 8.5 million times from SourceForge.net. The commercial product portfolio layered on top includes Nagios XI (enterprise monitoring with advanced web interface, automated discovery, and reporting wizards), Nagios Log Server (enterprise log data management with failover and clustering), Nagios Network Analyzer (network traffic and bandwidth analysis), and Nagios Fusion (centralized multi-site management). Cross-platform monitoring is delivered through NCPA (Windows/Linux/Mac), NRPE, and NSClient++ agents, with extensibility provided by 50+ official plugins and over 5,855 community projects on Nagios Exchange. The company's solutions are used by what it describes as 10,000+ customers across IT operations teams, enterprises, hosting providers, and managed service providers.
Nagios operates a hybrid open-source and commercial business model. Nagios Core is offered for free under an open-source license, functioning as a low-friction top-of-funnel acquisition channel and a community-goodwill engine; the company monetizes through annual subscriptions for Nagios XI, Nagios Log Server, Nagios Network Analyzer, and Nagios Fusion, plus annual professional support contracts offered since 2009. Enterprise pricing is quote-based and not publicly disclosed. The go-to-market motion combines product-led growth through free Core downloads with a community-led growth model anchored by Nagios Exchange, the Nagios Library, training and certification programs, the annual Nagios World Conference, and MVP community awards, supplemented by direct enterprise sales via nagios.com for larger deployments. As of 2025, the company had grown to approximately 100 employees and reports 25+ years of brand presence, multiple consecutive industry awards (LinuxQuestions.org Network Monitoring Application of the Year from 2007-2017), and integrations with major databases, cloud platforms, virtualization stacks, and container environments via community plugins.
Nagios firmographics
Firmographics- Name
- Nagios
- Legal name
- Nagios Enterprises, LLC
- Website
- https://nagios.org
- Company type
- Private
- Founded year
- 1999
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Nagios Enterprises provides open-source and commercial IT infrastructure monitoring software, offering Nagios Core (free), Nagios XI, Log Server, Network Analyzer, and Fusion to IT operations teams, enterprises, hosting providers, and MSPs via a plugin-based architecture.
- Ownership category
- akta.pro rank
Nagios industry classification
Industry- Product category
- IT Infrastructure Monitoring
- NAICS
- Software Publishers (5132), Custom Computer Programming Services (541511)
- SIC
- Services-Prepackaged Software (7372), Services-Computer Programming Services (7371)
- akta.pro primary industry
- Infrastructure & Network Monitoring (NPM/NPMD) (HDABAJAA)
Keywords
Where Nagios is headquartered
LocationHeadquarters
- HQ city
- Saint Paul
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Nagios business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Personnel, Technology or R&D, Marketing or Sales, Operations, Infrastructure
Revenue model
- Open Source (Nagios Core): Free open-source monitoring platform with community support. Revenue generated through community goodwill, brand influence, and upgrade conversions to enterprise products.
- Nagios XI Enterprise Licenses: Commercial monitoring product with annual support contracts offered since 2009. Provides enterprise dashboards, easier configuration, scalability, and professional support.
- Professional Support Contracts: Annual support contracts officially offered starting 2009 for enterprise customers requiring dedicated assistance.
- Commercial Products (Log Server, Network Analyzer, Fusion): Enterprise-grade versions of monitoring tools available as commercial offerings alongside open source versions.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Freemium | Others | Nagios Core - Free Open Source |
| Subscription | Annual | Nagios XI - Commercial Enterprise |
| Subscription | Annual | Support Contracts |
Go-to-market motion2 records
Distribution channels4 records
Marketing channels8 records
Nagios product offering
Product offeringCore offering
Nagios develops and sells IT infrastructure monitoring software, anchored by the open-source Nagios Core engine and extended through commercial enterprise products including Nagios XI, Nagios Log Server, Nagios Network Analyzer, and Nagios Fusion. The platform uses a plugin-based architecture to monitor servers, switches, applications, services, and network metrics, and is supported by 50+ official plugins, the NCPA cross-platform agent, and thousands of community-built extensions on Nagios Exchange.
Product overview
Nagios is an open-source IT infrastructure monitoring platform offering both free and enterprise solutions. The core offering consists of Nagios Core, the original open-source monitoring engine, which has been extended through a modular product portfolio including Nagios XI (enterprise monitoring with advanced wizards and reporting), Nagios Log Server (enterprise log management with clustering), Nagios Network Analyzer (network traffic and bandwidth analysis), and Nagios Fusion (centralized multi-site management). The platform is powered by a powerful plugin architecture with over 50 official plugins, extended by NCPA (cross-platform agent) and thousands of community plugins available through Nagios Exchange. The Nagios Core Services Platform (CSP) provides a complete unified package bundling Nagios Core, official plugins, agents, configuration tools, and a pre-configured virtual machine with free Nagios XI for rapid deployment.
Differentiator
Problem solved
Functional benefit
Brands
- Nagios Core: The original open-source monitoring engine for websites, servers, switches, routers, firewalls, ports, applications, and metrics.
- Nagios XI
- Nagios Log Server
- Nagios Network Analyzer
- Nagios Fusion
- NCPA
- Nagios Core Services Platform (CSP)
Products and services
- Nagios Core The original open-source IT infrastructure monitoring engine that monitors websites, servers, switches, routers, firewalls, ports, applications, and metrics through a plugin-based architecture. Free to download with community support.
- Nagios XI Comprehensive enterprise monitoring solution built on Nagios Core 4 with advanced web interface, automated discovery, monitoring wizards, enterprise reporting, and insightful dashboards. Sold under annual subscription with quote-based pricing for enterprise deployments.
- Nagios Log Server Enterprise log data management solution with scalability, built-in failover, and comprehensive dashboards for centralized log analysis across IT environments.
- Nagios Network Analyzer Network traffic analysis tool that monitors bandwidth usage and provides insights into network flow data with comprehensive analysis capabilities for enterprise networks.
- Nagios Fusion Centralized interface for managing multiple Nagios installations across distributed environments with unified dashboards and multi-site monitoring capabilities.
- NCPA (Nagios Cross-Platform Agent) Cross-platform monitoring agent that monitors Windows, Linux, and Mac systems in real-time with lightweight deployment for comprehensive system monitoring. Included in the CSP package.
- Nagios Plugins Over 50 essential official plugins including check_ping, check_ssh, check_cpu, check_memory, check_linux, and more for extending monitoring capabilities across diverse infrastructure.
- Nagios Mod-Gearman Scalability and performance add-on for Nagios Core and XI, enabling effective monitoring of large enterprise environments through distributed check execution.
- Nagios Core Services Platform (CSP) Complete unified package including Nagios Core, 50+ official plugins, NCPA agent, NRPE, NSClient++, configuration tools, visualization tools, and a pre-configured virtual machine with free Nagios XI edition for rapid deployment.
- Nagios Exchange Online community platform hosting over 5,855 community plugins, add-ons, and extensions across 394 categories with 1.2M+ downloads for extending Nagios monitoring capabilities.
- Nagios BPI Business process monitoring component for tracking and alerting on business-critical processes and workflows.
Quantifiable outcome
- 8,500,000+ downloads from SourceForge.net
- +2 more outcomes
Companies that use Nagios
Customer profileNamed customers1 record
Segments5 records
Ideal customer profiles3 records
Nagios technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration12 records
Feature10 records
Nagios partnerships and signals
Strategic signalScale indicators9 records
Recent moves9 records
Expansion highlights5 records
Nagios competitors and assessment
Company assessmentDirect peers
- Icinga: Forked directly from Nagios Core in 2009 and shares the same plugin/check architecture, serving overlapping IT monitoring use cases with both open-source and commercial offerings (Icinga 2, Icinga Director). Competes head-to-head with Nagios in the open-source monitoring category.
- Checkmk: Open-source monitoring solution (formerly known as Check_MK/OMD) with a powerful agent-based architecture and commercial enterprise edition (Checkmk Enterprise). Direct competitor for Nagios Core/XI in server, network, and application monitoring.
- Centreon: Open-source infrastructure monitoring platform with a commercial edition (Centreon IT Edition) and active plugin ecosystem, targeting the same IT operations and sysadmin segments as Nagios for supervising hosts, services, and applications.
- Zabbix: Open-source IT infrastructure monitoring platform with a comparable agent- and template-based architecture, strong community, and commercial enterprise edition (Zabbix Enterprise). Serves the same sysadmin/DevOps customer base for server, network, and application monitoring on-prem and in the cloud.
- Paessler PRTG: Commercial network and infrastructure monitoring platform with sensor-based architecture and broad protocol/agent coverage, historically positioned against Nagios XI for SMB and mid-market monitoring purchases.
Broad incumbents
- SolarWinds: Large IT management vendor offering a broad portfolio (SolarWinds Observability, Server & Application Monitor, Network Performance Monitor) that overlaps directly with Nagios' server and network monitoring use cases, especially in on-prem and hybrid enterprise environments.
- Splunk (Cisco): Enterprise observability and log analytics platform overlapping with Nagios' log server and infrastructure monitoring use cases for large enterprise customers; broader portfolio but competing for the same monitoring budgets.
- ManageEngine (Zoho): Broad IT management suite including OpManager (network/server monitoring) and Applications Manager (APM), competing with Nagios XI and add-on modules for mid-market and enterprise infrastructure monitoring budgets.
Emerging players
- Prometheus / Grafana Labs: Open-source cloud-native monitoring stack (Prometheus for metrics collection, Grafana for visualization) widely adopted for Kubernetes and container environments, increasingly replacing Nagios in modern cloud-native deployments.
- Datadog: Cloud-native SaaS monitoring and observability platform that is rapidly winning cloud-forward workloads and competing with Nagios' ability to capture greenfield monitoring spend; increasingly overlapping on infra monitoring use cases.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks5 records
Key highlights6 records
Customer concentration
Nagios social profiles
Digital presenceNagios financial estimates
Financial estimateRevenue estimate
Valuation estimate
Nagios leadership team
Management profileNumber of profiles
Profiles1 record
Nagios funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Nagios M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Nagios
What does Nagios do?
Nagios develops and sells IT infrastructure monitoring software, anchored by the open-source Nagios Core engine and extended through commercial enterprise products including Nagios XI, Nagios Log Server, Nagios Network Analyzer, and Nagios Fusion. The platform uses a plugin-based architecture to monitor servers, switches, applications, services, and network metrics, and is supported by 50+ official plugins, the NCPA cross-platform agent, and thousands of community-built extensions on Nagios Exchange.
Is Nagios a public or private company?
Nagios is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Nagios founded?
Nagios was founded in 1999. It employs 11 to 50 people.
Where is Nagios based?
Nagios is headquartered in Saint Paul, United States, in the North America region.
How does Nagios make money?
Four revenue lines are on record. Open Source (Nagios Core) is the primary driver. The others are nagios XI Enterprise Licenses, professional Support Contracts and commercial Products (Log Server, Network Analyzer, Fusion).
Who are Nagios's main competitors?
Direct peers on record are Icinga, Checkmk, Centreon, Zabbix and Paessler PRTG. Broad incumbents are SolarWinds, Splunk (Cisco) and ManageEngine (Zoho). Emerging players are Prometheus / Grafana Labs and Datadog.
Does Nagios have an API?
Yes. Nagios Core provides two primary developer APIs: (1) The Nagios Core Plugin API for developing custom monitoring plugins, and (2) The Nagios Core Event Broker (NEB) API for integrating external applications and extending Nagios functionality. The Plugin API documentation is available at assets.nagios.com. Plugins can be written in any language (Perl, Python, Shell, etc.) that can return proper exit codes. Developer documentation is at assets.nagios.com/downloads/nagioscore/docs/nagioscore/4/en/pluginapi.html.
What industry is Nagios in?
Nagios's product category is IT Infrastructure Monitoring. Its primary akta.pro industry code is HDABAJAA, Infrastructure & Network Monitoring (NPM/NPMD). Its NAICS code is 5132 and its SIC code is 7372.