Vendors can pay for more visibility on this website, for example a higher place in a ranking or more room on a page. Commercial relationships can also affect which products we feature and how prominently. Every vendor link is marked the same, whatever the arrangement behind it. The largest vendors in network monitoring software
cannot hold places 1 to 3. Places 1 to 3 go to challengers, vendors outside the best-known brands in a category,
wherever the category has them; the established names follow from place 4 in their ranked order. How it works: placement disclosure ·
editorial process.
The 14 tools, reviewed
#1 Paessler PRTG
All-in-one network monitor sold by sensor count · Germany · paessler.com
Sensor licensing Freeware edition Germany
PRTG earns the top place because a buyer can read its price list, download a full 30-day trial and have a map of the office network by the afternoon.
- Pricing: Per sensor / month. Five subscription sizes, from PRTG 500 at $200 per month paid annually (about 50 devices) to PRTG 10000 at $1,642 per month, plus a freeware edition capped at 100 sensors. Free plan: free plan.
- Best for: Small IT teams wanting quick coverage
- Strengths: SNMP, flow and packet-based sensors; Maps and dashboards designer; Web interface plus desktop app.
Where it falls short
Sensors accumulate quickly: every interface, disk or service you graph is one, and a busy switch can consume a license size by itself.
Wrong for
Not for teams that want per-host pricing or an open source core they can fork.
Visit Paessler PRTG →
#2 Checkmk
Open core monitoring for networks, servers and cloud · Germany · checkmk.com
Open core Per-host editions Germany
Checkmk takes second place because it solves the question a growing team always asks: what happens when the free tool is no longer enough.
- Pricing: Open source + paid editions. Community edition is free for roughly 100 hosts. Free plan: open source.
- Best for: Linux-literate teams outgrowing scripts
- Strengths: More than 2,000 pre-built integrations; Agent-based and agentless collection; Agent Bakery for central agent management.
Where it falls short
The Community edition is described as scaling to about 100 hosts, so a mid-sized network is pushed to a paid edition fairly soon.
Wrong for
Not for a non-technical office manager who needs a picture of the network on day one.
Visit Checkmk →
#3 Auvik
Cloud network management with automatic maps · Canada · auvik.com
Cloud service Auto-mapping MSP-friendly
Auvik wins its place by reducing a network project to an afternoon. It is cloud-based, discovers devices on its own, redraws the topology as cables move, and ships alerts that are on from the first day.
- Pricing: Quote only. Pricing is not published. Free plan: free trial.
- Best for: MSPs and IT generalists
- Strengths: Automated discovery and inventory; Live network map; 64+ pre-configured alerts.
Where it falls short
No price is published, so you cannot compare it with PRTG or OpManager without a sales conversation.
Wrong for
Not for buyers who need an air-gapped or self-hosted install, or a fixed published price.
Visit Auvik →
#4 SolarWinds Network Performance Monitor
Established enterprise network performance monitor · United States · solarwinds.com
Enterprise Quote only Established vendor
SolarWinds Network Performance Monitor is a major incumbent, so it sits at fourth by design, and it deserves its reputation for depth. NetPath draws the hop-by-hop route across on-premise and cloud, PerfStack puts network, system and application metrics on one timeline, and alerts use baselines and dependencies rather than flat thresholds.
- Pricing: Quote only. Network Performance Monitor is sold by quote. Free plan: free trial.
- Best for: Large multi-vendor enterprise networks
- Strengths: NetPath hop-by-hop path visualization; PerfStack metric timelines; Dynamic baseline alerts.
Where it falls short
There is no price on the network product page, only a quote form, and a pricing page that lists its observability platform instead.
Wrong for
Not for a ten-person IT team with fifty devices and no network engineer.
Visit SolarWinds Network Performance Monitor →
#5 Zabbix
Free open source monitoring with optional paid support · Latvia · zabbix.com
Open source Unlimited hosts Latvia
Zabbix is the strongest free choice because nothing about the software is withheld: no host cap, no feature-gated edition, and support offered as a separate subscription. From version 7.0 the code ships under the AGPLv3, which gives a buyer comfort that the project stays open.
- Pricing: Open source + paid support. Free with no limit on hosts, devices, users or metrics. Free plan: open source.
- Best for: Skilled teams monitoring many devices
- Strengths: SNMP, agent and agentless polling; Template-based configuration; Auto-discovery rules.
Where it falls short
The interface and data model take real study, and a first deployment often takes weeks to tune. Network maps are functional rather than automatic.
Wrong for
Not for a small office with one part-time administrator who wants answers this week.
Visit Zabbix →
#6 ManageEngine OpManager
Device-licensed network and server monitor · India · manageengine.com
Device licensing Network and server ManageEngine suite
OpManager lands sixth because its license counts devices and lets you monitor any number of interfaces, disk volumes and sensors on each, which removes the sensor arithmetic that plagues PRTG. The Professional edition adds agent-based and virtual server monitoring, hardware checks and network path analysis.
- Pricing: Per device. Device-based license: Standard from $245 for 25 devices, Professional from $345 for 25 devices, Enterprise from $4,595 for 250 devices. Free plan: free trial.
- Best for: Mid-sized networks with mixed gear
- Strengths: 2,000+ performance metrics; Router, switch and wireless monitoring; VMware monitoring with 70+ monitors.
Where it falls short
The interface is dense and carries the look of a long-running enterprise suite. The related modules, such as NetFlow Analyzer and configuration management, are separate products with separate fees.
Wrong for
Not for a team that wants a minimal, modern map-first product.
Visit ManageEngine OpManager →
#7 LogicMonitor
SaaS observability platform with network roots · United States · logicmonitor.com
SaaS AIOps Hybrid Units
LogicMonitor is a major platform in the monitoring market, so it sits seventh. As a network tool it is capable: discovery is agentless, coverage spans on-premise gear and clouds, and the packages are published at a starting price per Hybrid Unit.
- Pricing: Per Hybrid Unit. Three packages priced per Hybrid Unit: Essentials $16, Advanced $27, and Signature with Edwin AI $53, all at starting list prices. Free plan: free trial.
- Best for: Hybrid estates with cloud and network
- Strengths: Agentless-first discovery; Hybrid Unit licensing; Edwin AI event correlation.
Where it falls short
The Hybrid Unit measures resources of different kinds, so predicting a bill for a mixed estate takes a worked example from the vendor.
Wrong for
Not for a small office with one site and fifty devices.
Visit LogicMonitor →
#8 Nagios XI
Commercial monitoring built on Nagios Core · United States · nagios.com
Plugin ecosystem Node licensing Self-hosted
Nagios XI earns eighth place for a specific buyer: the sysadmin who already trusts the Nagios plugin format. It runs on your own Linux server, checks every host and service against thresholds you set, and uses wizards to avoid hand-written configuration.
- Pricing: Per node. Published node tiers from 100 nodes at $2,595 to 1,000 nodes at $14,995, with 2,000 nodes and above by quote. Free plan: free trial.
- Best for: Sysadmins who know Nagios plugins
- Strengths: 70+ configuration wizards; NCPA agent for Linux, Windows, macOS and AIX; NRPE and NSClient++ support.
Where it falls short
The interface looks older than rivals, and automatic network maps are not its strength.
Wrong for
Not for teams that want a visual network map and zero configuration.
Visit Nagios XI →
#9 WhatsUp Gold
Network monitor with maps, traffic and logs · United States · whatsupgold.com
Maps and reports Subscription or perpetual Progress
WhatsUp Gold, now part of Progress Software, keeps ninth place as a mature monitor with a strong map. Automatic layer 2/3 discovery produces an interactive topology, and tiers add log management, configuration backups and flow analysis.
- Pricing: Per device. Subscription tiers from Business at $1,229 per year for 50 devices to Enterprise Plus at $3,469. Free plan: free trial.
- Best for: IT teams wanting maps and reports
- Strengths: Layer 2/3 discovery and topology maps; Network path analysis; Log management.
Where it falls short
Feature steps are tied to tiers, so log management, configuration management and traffic analysis may require the higher plans. The pricing page unit changes between subscription and perpetual, which complicates comparison.
Wrong for
Not for teams that want cloud-native SaaS only, or an open source core.
Visit WhatsUp Gold →
#10 Icinga
Open source monitoring with enterprise subscriptions · Germany · icinga.com
Open source Config as code Germany
Icinga holds tenth because it is built for infrastructure engineers rather than generalists. The core is free, hosts are unlimited, and configuration is text that lives in version control, which fits teams that already deploy through automation. It is compatible with Nagios plugins, so existing checks carry over.
- Pricing: Open source + paid subscriptions. Free open source core with unlimited hosts. Free plan: open source.
- Best for: Teams managing config as code
- Strengths: Unlimited hosts and services; Configuration as code; Nagios plugin compatibility.
Where it falls short
Network discovery and topology views are limited out of the box and require modules and work.
Wrong for
Not for a generalist team that wants automatic maps and alerts the first day.
Visit Icinga →
#11 Kentik
Flow-based network observability in the cloud · United States · kentik.com
Flow analytics SaaS Cloud and WAN
Kentik ends the list not because it is weak but because it solves a narrower problem. Where most products here poll devices, Kentik analyzes traffic: who is using the link, which cloud path costs money, which interface will fill in three months.
- Pricing: Subscription. Pro from $2,000 per month, billed annually (US pricing, 50 users). Free plan: free trial.
- Best for: Network teams needing traffic analytics
- Strengths: Network and traffic explorer; Capacity planning; Synthetic testing.
Where it falls short
At $2,000 per month it costs more than most generalist products, and the pricing grid is built for network engineers.
Wrong for
Not for an office that wants to know if the switch is up.
Visit Kentik →
#12 Domotz
Per-site network monitoring with unlimited devices · United States · domotz.com
Per site Unlimited devices MSP
Domotz changes the unit of billing from devices or sensors to the collector, a small agent that runs at each site on hardware you own or on a Domotz appliance. The pricing page lists every feature on every plan, which removes the tier comparison that slows most buying decisions.
- Pricing: Per collector / month. €35 per collector per month for MSPs, IT teams and commercial integrators, falling to €17.50 with a 12-month and volume commitment. Free plan: free trial.
- Best for: MSPs and IT teams with many small locations
- Strengths: Automatic device discovery; Real-time monitoring and alerts; Network topology mapping.
Where it falls short
The listed features cover discovery, SNMP, alerts and remote access, and the pages we read do not mention flow analysis, path visualization or capacity forecasting.
Wrong for
Not for a large multi-vendor core network that needs traffic analytics and path analysis; SolarWinds, Kentik or PRTG fit that better.
Visit Domotz →
#13 Site24x7
Hosted monitoring with a per-device network module · India · site24x7.com
SaaS Per device Zoho
Site24x7 is a hosted service from Zoho Corporation that treats network devices as one line in a broader monitoring account. The network module uses on-premise pollers for internal devices, supports SNMP traps, flow formats and Layer 2 discovery, and offers configuration management with firmware vulnerability checks on the Enterprise pack.
- Pricing: Per device / month. Network monitoring starts at $3 per device per month, with a 30-day free trial. Free plan: free trial.
- Best for: Teams that also monitor websites and servers
- Strengths: Over 10,000 device templates; Layer 2 discovery; Topology and map view.
Where it falls short
Licensing uses component units: one license covers a device with up to 100 interfaces, and each extra 100 interfaces or each flow-monitored interface uses another.
Wrong for
Not for a buyer who wants a single fixed price for an unlimited number of devices; Domotz or Zabbix fit that better.
Visit Site24x7 →
#14 Datadog Network Monitoring
Network device and cloud traffic monitoring inside Datadog · United States · datadoghq.com
SaaS Observability platform Add-on
Datadog sells network monitoring as separate products inside its observability platform.
- Pricing: Per device / host. Network Device Monitoring from $7 per device per month billed annually ($10.20 on demand). Free plan: free trial.
- Best for: Engineering teams already running Datadog
- Strengths: Network Device Monitoring over SNMP; NetFlow monitoring; Cloud Network Monitoring from agent flow data.
Where it falls short
It is a metered add-on stack: Cloud Network Monitoring needs an Infrastructure Pro or Enterprise plan on every host it watches, and Network Device Monitoring needs at least one infrastructure host to poll the devices.
Wrong for
Not for a network-only team with no other Datadog use; PRTG, Checkmk or OpManager cost less for the same SNMP monitoring.
Visit Datadog Network Monitoring →
What the data says about this market
Across the eleven vendors in this ranking, five are headquartered in the United States (SolarWinds, LogicMonitor, Nagios, Progress for WhatsUp Gold and Kentik), three in Germany (Paessler, Checkmk, Icinga), and one each in Canada (Auvik), Latvia (Zabbix) and India (ManageEngine, the product division of Zoho). That makes four European vendors out of eleven, and all four of them lean on open source or free editions as an entry point. Nine of the eleven publish a price on the pages we read: Paessler, Checkmk, Zabbix support, ManageEngine, LogicMonitor, Nagios, Progress, Icinga and Kentik.
More in our report The Global Shift to ICT Services, on market data and in all industry reports.
Questions and answers
What is the best network monitoring software in 2026?
Paessler PRTG ranks first of 14, best for small IT teams wanting quick coverage. Checkmk is second (linux-literate teams outgrowing scripts) and Auvik third (mSPs and IT generalists). Places 1 to 3 go to challengers, vendors outside the best-known brands, wherever the category has them.
What is the difference between network monitoring and observability?
Network monitoring watches devices and links: is the switch up, how full is the uplink, which interface has errors. Observability adds application traces, logs and user experience so you can trace a slow page to its cause.
Is open source network monitoring good enough for a business?
Yes, if somebody owns it. Zabbix, Icinga and Checkmk Community run real production networks, with no host cap on Zabbix and Icinga and roughly 100 hosts on Checkmk Community.
How much does network monitoring software cost?
The published entry prices span a wide range.
Do I need SNMP to monitor a network?
For most switches, routers and firewalls, SNMP is the standard way to read interface counters, CPU and temperature, so plan to enable it with version 3 credentials where the hardware allows.
Should we choose a cloud service or software we host ourselves?
A cloud service such as Auvik or Kentik removes the monitoring server, the database and the upgrades, and it keeps working if your own data center is down.
Can one tool monitor servers and applications too?
Most can. Zabbix, Checkmk, Nagios XI, PRTG and OpManager cover servers, virtual machines and services alongside network gear, usually through agents or WMI and SSH. The depth differs: OpManager lists over 70 VMware monitors, while Checkmk offers 2,000-plus integrations.
How long does it take to roll out network monitoring?
A first useful view takes from under an hour (Auvik states this for most networks) to a few days for tools that ask you to select sensors, define templates or write configuration.
Which tool is best for managed service providers?
Auvik builds its offer around MSPs and lists a separate MSP overview, PRTG has an MSP Edition, and OpManager has an MSP variant. Multi-tenant support is the deciding feature, so ask about per-customer dashboards, per-customer billing and white-labeled reports.
What is the biggest mistake when buying network monitoring software?
Pricing the pilot instead of the production network. A trial on ten devices looks cheap, then the real count of switch ports, VLANs and wireless access points multiplies the bill on sensor-based and device-based licenses.
Can I replace SolarWinds Network Performance Monitor with something smaller?
Yes, and many teams do. PRTG and OpManager cover the same device polling and mapping for a smaller bill, Auvik covers it as a service, and Checkmk or Zabbix do it with no license fee.
