Monitoring that stays running.
Nagios XI delivers granular alerting, customizable dashboards, and fast root-cause analysis so your team stays ahead of downtime.
Free 30-day trial with the full feature set. Installs on your own server, on premises.
Trusted by 10K+ Teams Worldwide
Nagios XI is commercial IT infrastructure monitoring software that runs on a Linux server you own. It executes plugins against your Hosts and Services on a fixed interval, compares each result against the Warning and Critical ranges you set, records the outcome, and notifies the contacts you assigned. Nagios Core is the open source monitoring engine underneath it. Nagios XI adds the web interface, Configuration Wizards, the database, reporting, dashboards, and the API.
A Node, also called a Host, is anything with an IP address or fully qualified domain name. Services are the individual checks you run against it, and there is no limit on how many.
Every check returns OK, Warning, Critical, or Unknown by comparing a measured value against ranges you set. Nothing is guessed and nothing is inferred.
State changes reach the contacts you assigned, escalate when nobody responds, and can run a script that fixes the problem without waking anyone.
How a metric leaves a machine is your choice, and most environments need more than one answer. Nagios XI ships four transports, and the Configuration Wizards set up whichever you pick.
Nagios XI supports every route on one server, so a mixed environment does not become two monitoring systems.
Nothing kills a monitoring project faster than trying to hand-write every definition.
Nagios Configuration Wizards asks what you want to monitor, shows you what it found on the device, and writes the Host and Service definitions for you. No configuration file, no restart by hand.
An Auto-Discovery job scans a subnet using ping and nmap and returns what answered. Feed those results straight into a Configuration Wizard and the switch somebody racked two years ago gets monitored alongside the servers you built yourself. Jobs run from Configure > Configuration Tools > Auto-Discovery.
Linux and Windows servers, switches and routers, VMware vSphere, Hyper-V, Proxmox VE, Nutanix CE, XCP-ng, Docker container monitoring, Kubernetes, Red Hat OpenShift, SQL Server database monitoring, MySQL, Oracle, Postgres, MongoDB, Microsoft 365, Amazon EC2 and S3, Microsoft Azure, Google Cloud, and Akamai Cloud, among others. Each one asks for credentials, shows you what it found on the target, and lets you pick the checks and thresholds before it writes anything.
Some Wizards require active Maintenance & Support benefits. Those are listed as Premium features.
A Nagios plugin is any executable that returns an exit code and, optionally, performance data. Write it in bash, Python, PowerShell, Perl, or a compiled language, and XI will run it, graph it, and alert on it like anything else. The Generic Plugin Wizard wraps a plugin you wrote into the same interface as the shipped Wizards, so the people who use the monitoring system do not have to know it was custom.
Thousands more plugins are published by the community on Nagios Exchange. Community plugins install separately from XI and are maintained by their authors.
Configuration snapshots record the state of your configuration so you can compare two points in time and roll back the change that broke things. The Core Config Manager edits Hosts, Services, templates, and time periods directly when a Wizard is not the right tool.
The Enterprise Edition adds bulk modification across thousands of objects at once, and a Bulk Renaming Tool that keeps historical performance and alert data attached to the renamed object rather than orphaning it.
Build the view each team needs from dashlets, set it as their home page, and put the wall display on rotation.
Build a view from graph, bar chart, gauge, pie chart, statistic, treemap, data table, alert heatmap, text, and URL dashlets, filtered to the Hosts, Services, or groups that team owns. Administrators can deploy a dashboard to other users or publish it globally, and any Smart Dashboard can be set as a user's XI home page so the first screen after login is already the right one.
Any plugin that returns performance data is graphed from its first check, with no extra configuration. Graph Explorer stacks metrics from different Hosts on a shared axis for comparing a cluster against itself, and the underlying data downloads as CSV when the question belongs in a spreadsheet.
Host and Service status pages filter by group, state, and text. NagVis draws your own topology over a background you supply, and supports custom actions from a map shape. The Network Status Map lays devices out by parent relationship, and the World Map places them by coordinates.
A View rotates dashboards, status pages, and external URLs on a timer. Combined with Automatic Login, a screen in the operations room comes back on its own after a reboot without anyone typing a password into it.
Nagios XI compares each check result against the Warning and Critical ranges you set. What happens next is configurable at every step, which is how a monitoring system stops producing alerts nobody reads.
Email, SMS through Twilio or a Multi-Tech modem, Slack, Discord, and SNMP traps out to another management system. Time periods decide when each contact is reachable, so the overnight rota is a property of the contact rather than something a person has to remember.
Acknowledging a problem or scheduling downtime stops the repeat notifications for something a human is already dealing with.
A Host or Service escalation moves the notification to a different contact group after a set number of notifications have gone unanswered. The help desk hears about it first, the on-call engineer hears about it if nothing changed, and the manager hears about it if that did not work either.
An escalation overrides the notification options and contacts set on the object while it is in effect. Set escalations up knowing they take priority over what the Host or Service says.
An event handler is a script or executable XI runs when a Host or Service changes state. Restart the service, clear the spool, bounce the interface, open a ticket. XI passes the state and the state type into the script, so an event handler can act only on a HARD Critical and ignore the SOFT states that a single failed check produces.
That distinction is the difference between automated remediation and a service that restarts every time the network hiccups.
Notifications only go out after a Service reaches a HARD state, so a transient failure does not page anyone. Dependencies suppress the twenty alerts that follow one switch going Down. The Enterprise Edition adds Deadpool settings, which remove configuration for Hosts and Services that have sat in a problem state long past the point of being informative.
State history and performance data start accumulating on the first check, whether or not anyone asks for a report. When the question arrives, the answer is already recorded.
| Capability | Standard | Enterprise |
|---|---|---|
| Configuration Wizards, Auto-Discovery, dashboards, graphs | Included | Included |
| Configuration rollback and snapshots | Included | Included |
| Availability, bandwidth usage, and executive summary reports | Included | Included |
| Scheduled reports and scheduled pages | Not included | Included |
| Service-Level Agreement (SLA) report | Not included | Included |
| Capacity Planning | Not included | Included |
| Advanced Business Process Monitoring | Not included | Included |
| Bulk modification, renaming, and notification settings | Not included | Included |
| Audit Log and Deadpool settings | Not included | Included |
| SNMP Trap Interface | Not included | Included |
Explore In More Detail: Nagios XI Edition Comparison
Nagios XI supports multiple monitoring architectures for large and distributed environments. Choose the model that fits how your network is built.
Nagios XI installs on a Linux server you own. Where that server sits, and whether it ever reaches the internet, is your decision.
Download a pre-packaged image for VMware Workstation and Oracle VirtualBox, VMware ESXi and vSphere, or Microsoft Hyper-V, and have Nagios XI running without touching a package manager.
Install directly onto a clean Linux server, on your own hardware or in your own cloud account, with full control of the system underneath it.
Offline installation is supported on Red Hat and CentOS Stream, as a direct install rather than a virtual machine image. Dependencies ship inside the installer, so there are no local repository mirrors to stand up first.
Authenticate against Active Directory or LDAP over SSL, or set up Single Sign-On with Microsoft Entra ID, with two-factor through Duo. Users see only the Host and Service groups you grant them, so one installation serves several teams without any of them seeing the others.
Perpetual licensing, priced by the number of Nodes (Hosts) you monitor. Services are unlimited, so adding checks to a Host you already license costs nothing.
Infrastructure monitoring, graphing, and alerting for small to medium environments.
Everything in Standard, plus the reporting and bulk tooling a larger environment needs. Available as an add-on to any licence level.
Multiple unlimited-Node installations for large or distributed environments running XI at more than one site.
| Nodes (Hosts) | Standard | Enterprise |
|---|---|---|
| 100 | $2,595 | $4,690 |
| 200 | $4,395 | $6,490 |
| 300 | $6,195 | $8,290 |
| 400 | $7,295 | $9,390 |
| 500 | $8,295 | $10,390 |
| 750 | $11,495 | $13,590 |
| 1000 | $14,995 | $17,090 |
| 2000 and above | Contact Sales | |
Not sure how many Nodes you need? Use the XI Plan Calculator, or see all Nagios pricing plans.
| Licensed on | Nodes, also called Hosts. A Node is any unique IP address or Fully Qualified Domain Name you monitor: a server, switch, router, firewall, workstation, or appliance. |
|---|---|
| Services | Unlimited. Paid licenses place no limit on the number of Services you run against the Nodes you licensed. |
| License term | Perpetual. The license is yours permanently, and the Standard Edition keeps running whether or not Maintenance & Support is renewed. |
| Installations per key | Three. One production install, one test or lab install, and one disaster recovery install that stays non-operational until it takes over or is monitoring the production instance. |
| First year included | Version upgrades, up to ten support cases, access to the Nagios Support Portal, Premium features, and an assigned Customer Success Manager. Renewing your Maintenance & Support plan keeps all of it active. |
| Enterprise Edition | An add-on to any license level, and included with every Sitewide package. |
| Questions | [email protected], 1-888-624-4671 in the United States, or +1 651-204-9102 internationally. |
Seven Nodes or 100 Services, whichever comes first, with most Standard Edition features. Self-supported.
No credit card required
I love the stats and graphs Nagios XI gives me. I can give that to my leadership team to prove how the network is performing and what's proactively being done. Considering the time that Nagios XI saves me personally, the cost is a no-brainer.
IT Director
North American logistics services provider
A wireless provider covering rural Indiana, Ohio, and Illinois needed checks its previous system could not perform without a quote for every custom one. Nagios XI now watches every point of presence, and the checks nobody else would write get written in-house.
Read the case studyJordan's national exchange runs its trading infrastructure on a single Nagios XI deployment, and grew it from 200 Nodes to 300 without changing the architecture underneath it.
Read the case studyOne IT director serves 300 employees across 13 work sites and every subsidiary in the group. Configuration Wizards, dashboards, and scheduled reporting are what make that ratio survivable rather than heroic.
Read the case studyNagios XI is commercial IT infrastructure monitoring software that runs on a Linux server you own. It executes checks against your servers, network devices, applications, and services on the interval you set, compares each result against the thresholds you defined, records the outcome, and notifies the people you assigned. It is built on the Nagios Core monitoring engine and adds a web interface, Configuration Wizards, a database, reporting, dashboards, and a REST API.
Yes. The free license monitors 7 Nodes or 100 Services, whichever is reached first, and includes most Standard Edition features. It is self-supported. Students may qualify for higher limits depending on their needs and qualifications. Nagios Core is also free and open source, with no Node or Service limit at all.
Nagios Core is the free, open source monitoring engine, configured by editing text files. Nagios XI is built on that engine and adds web-based configuration, 70+ Configuration Wizards, Auto-Discovery, a backing database, dashboards, performance graphing, reporting, multi-tenancy, a REST API, and a support contract. An existing Core configuration can be migrated into XI. See Nagios Core vs Nagios XI for a fuller comparison.
Licensing is perpetual and priced by the number of Nodes (Hosts) you monitor. A Node is any unique IP address or fully qualified domain name. There is no limit on the number of Services you run against those Nodes, so adding more checks to a Host you already licensed costs nothing. The first year of Maintenance & Support is included with the purchase.
The Standard Edition covers monitoring, configuration, dashboards, graphing, and core reporting. The Enterprise Edition adds Capacity Planning, Service-Level Agreement reports, scheduled reports and scheduled pages, Advanced Business Process Monitoring, the SNMP Trap Interface, bulk modification and renaming tools, the Audit Log, and Deadpool settings. Enterprise is an add-on to any license level. Compare the editions feature by feature.
Premium features require active Maintenance & Support benefits. They include Single Sign-On, the Nagios Mod-Gearman user interface, and a set of premium Configuration Wizards. Access comes with the first year of your license and continues as long as your plan is renewed. See Premium features for the full list.
Thirty days, with the full Enterprise Edition feature set and no credit card. License activation is not required during the trial period. Learn more about the free trial.
Three, each with a defined purpose. One production install that monitors your environment. One test or lab install for previewing upgrades and configuration changes, which is not to be used for production monitoring or notifications. And one disaster recovery install that stays non-operational unless it is monitoring the production XI instance or has taken over from it. An active-active pair needs a license for each system.
A perpetual license plus the first year of Maintenance & Support benefits: version upgrades for that year, up to ten support cases, access to the Nagios Support Portal, Premium features, and an assigned Customer Success Manager. Optional phone support contracts are available. See Maintenance & Support plan options.
The Standard Edition keeps running and keeps monitoring, and anything already configured stays in place. What you lose is the ability to change it: premium Configuration Wizards cannot be run again, version upgrades and server migration are unavailable, and expedited support channels close. Renewing restores access.
Nagios XI installs on 64-bit Linux. Supported distributions change with each release, so check the Nagios software and operating system compatibility matrix for the versions supported by the release you are installing. Red Hat and Oracle Linux additionally require CodeReady Builder to be enabled and a valid Red Hat subscription through Red Hat Subscription Management.
Nagios XI 2026R1.7, released 4 August 2026. Every release, including what changed and what was removed, is listed on the Nagios XI changelog.
No. Agentless monitoring over SNMP, WMI, WinRM, and SSH covers network devices, appliances, and servers where nothing can be installed. Agents are an option rather than a requirement: NCPA runs on Linux, Windows, macOS, and AIX, and XI also works with NRPE and NSClient++ where those are already deployed. Most environments end up using a mix.
Yes, four ways: the NCPA agent, NSClient++, WMI, or WinRM. Services, event logs, performance counters, disk usage, scheduled tasks, and Windows Updates all have Configuration Wizards. Windows event logs can also be forwarded to Nagios Log Server when you need to search their contents rather than alert on their state.
Yes. Because Nagios XI uses Nagios Core as its monitoring engine, custom plugins, event handlers, and community add-ons work with it. A plugin is any executable that returns an exit code and, optionally, performance data, so you can write one in whatever language suits the check. The Generic Plugin Wizard brings a custom plugin into the interface alongside the shipped Wizards. Community plugins are installed separately and maintained by their authors.
Yes, on Red Hat and CentOS Stream. From version 2024R1.3.2 onward the operating system dependencies are packaged inside the installer, so local repository mirrors are not required. An offline instance cannot upgrade through the web interface or check for new versions, and license renewals are applied manually, so upgrades use the offline tar file for the target version. Choose the offline method at install time if the server will stay offline.
Join thousands of teams who’ve eliminated downtime and reduced costs with Nagios XI.
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