Nagios Core vs Nmap comparison

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Nagios Core

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Executive SummaryUpdated on Oct 10, 2024

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Nmap and Nagios Core are prominent tools in network management. Nmap appears advantageous for security analysis and network discovery, whereas Nagios Core is preferred for comprehensive network monitoring.

Features: Nmap offers robust port scanning capabilities, OS detection, and flexible scripting options. It is ideal for detailed security audits and network inventory. Nagios Core provides extensive infrastructure monitoring, service availability alerts, and performance data collection.

Room for Improvement: Nmap could enhance its GUI for easier navigation, improve integration with other tools, and expand its reporting capabilities. Nagios Core could benefit from a simplified initial setup process, better user interface customization, and enhanced documentation for ease of use.

Ease of Deployment and Customer Service: Nmap is straightforward to deploy, requiring minimal configuration, with strong community support, making it ideal for quick assessments. Nagios Core needs a more involved setup due to its extensive capabilities, but supports third-party plugins for flexibility. Both have active community forums for troubleshooting and support.

Pricing and ROI: Nmap, being open-source, incurs no direct costs, providing an excellent ROI for network scans. Nagios Core, also open-source, might involve additional costs related to setup and training time, justified by its comprehensive monitoring abilities.

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To learn more, read our detailed Nagios Core vs. Nmap Report (Updated: March 2026).

Nagios Core vs. Nmap

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Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:

Categories and Ranking

Nagios Core

Ranking in Network Monitoring Software

10th

Average Rating

8.2

Reviews Sentiment

7.3

Number of Reviews

Ranking in other categories

IT Infrastructure Monitoring (10th)

Nmap

Ranking in Network Monitoring Software

17th

Average Rating

8.6

Reviews Sentiment

7.7

Number of Reviews

Ranking in other categories

No ranking in other categories

Mindshare comparison

As of March 2026, in the Network Monitoring Software category, the mindshare of Nagios Core is 1.9%, down from 3.0% compared to the previous year. The mindshare of Nmap is 0.8%, up from 0.5% compared to the previous year. It is calculated based on PeerSpot user engagement data.

Network Monitoring Software Mindshare Distribution
Product	Mindshare (%)
Nagios Core	1.9%
Nmap	0.8%
Other	97.3%

Network Monitoring Software

Featured Reviews

Husham Yaqoob

Senior System Administrator at Interactive Group

Monitoring solution provides comprehensive visibility across IT infrastructure

The good thing about Nagios Core is it covers everything. Everything in the IT domain, you can monitor anything. You can even monitor printers, the ports of printers, Core workstations, and storage. You can monitor the workflow Core and the utilization of computes. If you want to grasp everything of your IT equipment on a single interface, you can use Nagios. It's the best one. It provides dashboards, and you can also configure your emails and alerts with it. If something is critical, you can configure it to notify via emails. It has a very handy dashboard, providing live alerts and visibility for everything.

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AntoSebastin

Cyber Security Consultant - APAC at Logon Software

Scans the network and identifies vulnerabilities on each machine

Nmap is mostly helpful during compliance checks. We run the scanner to see how many devices are on our network and find vulnerabilities in those that aren't compliant. We also use it monthly to scan our network and identify devices that aren't connected properly. This helps us detect any issues related to the operating systems of these devices. The tool's most valuable feature is its vulnerability scanning. It allows us to scan a specific range of IP addresses and discover devices within that range. This makes it easy to identify devices and view their details. Port scanning is crucial for network management tasks. It helps us identify vulnerabilities by finding open ports that may be unused or misconfigured. This tool makes it easy to detect such issues. The OS detection feature is great. Unlike other tools, Nmap provides accurate information about asset vulnerabilities, helping us easily detect and address them. Using Nmap provides value to the company, especially during compliance audits. It helps generate reports on assets, updates on workstations, and insights into network activities and potential attacks. Additionally, Nmap detects vulnerabilities and provides port details, allowing us to close unused ports on the client machines.

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Quotes from Members

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:

Pros

"We use the product to monitor server applications."

"Other products are good but from the configuration point of view Nagios is really very lightweight. The price is really good in my opinion. Another important thing is that my Nagios engine still works with Dual core 8GB ram for the last 10 years."

"Provides timely notifications."

"We mostly use Nagios Core to integrate with Python and Bash Script."

"Nagios Core is stable."

"Dashboard provides monitor of total assets."

"The solution is quite efficient."

"It has made the life of the network operations staff more proactive in managing the resources of the infrastructure. It prevents disasters long before they can take place."

More Nagios Core pros

"It enables us to delve deeper and identify the services and open ports on the system and visualize this information on a dashboard automatically."

"It is a very user-friendly product."

"The tool's most valuable feature is its scripts. These scripts prove beneficial when security features may obscure or block connections. Nmap helps identify vulnerabilities across different systems, including web servers and various server types."

"The best feature of Nmap is that it lets me see useful information about each endpoint in my entire network environment. For example, I can see every single connection of the network as well as each and every port."

"It helps us secure the network infrastructure."

"The real-time reporting feature of Nmap is particularly valuable. It generates detailed reports on the source and destination IP addresses, the protocols used, and the types of traffic."

"The scanning procedure includes UDP ports which sets it apart from competitors."

"The solution detects the operating systems, which makes testing the software much easier before making the payload."

More Nmap pros

Cons

"It's not that easy to install the product itself. Also, the UI is a bit hard for regular users to navigate through."

"Nagios Core could improve by adding a user interface. If you want the user interface you have to use Nagios XI."

"Cloud monitoring is an area for improvement because there aren't too many plugins available."

"The mapping is a little hard."

"The core version is no match for the XI version."

"It would be nice if the company offered a sales or contract manager that was dedicated to our company so that we would have some sort of link to Nagios, and if we had issues or questions, we'd be able to contact them directly."

"It is a bit slow due to latency."

"The scalability needs improvement, it's not scalable at this time."

More Nagios Core cons

"Customization is not very user-friendly in Nmap."

"It takes a bit of time to get familiar with the solution and its options."

"There is room for improvement in the design, the GUI. It looks a bit odd. Maybe Nmap should improve it or add more widgets to make it more attractive, but the basic functionality is good and provides what we need."

"The price is high and could be cheaper."

"One of the drawbacks of the standard Nmap utility is that it does not come with a graphical user interface, unlike a number of other open-source alternatives such as Zenmap."

"Nmap needs to improve its scanning speed."

"Since I started using Nmap, it has been completely based on the command prompt and I think it would help other users if they implemented a decent GUI as well."

"The challenge often lies in finding suitable courses and professional resources."

More Nmap cons

Pricing and Cost Advice

"The enterprise version has technical support. The version we are using is free."

"It's free."

"I would rate the solution's pricing an eight out of ten."

"The product is cheaply priced."

"The Nagios Core (PNP4Nagios + Core) is free and can be setup by Netadmin within a few hours. The only additional cost is the cloud server."

"We are using the free version of Nagios Core."

"Nagios Core is free to use."

"We are using the open-source, unpaid version."

More Nagios Core pricing and cost advice

"Nmap is an open-source product. You don't need a license to install it."

"I am using the free version of Nmap."

"The solution is open source so it is free."

"Nmap is open source software, which suits us well because we are a manufacturing company and not an IT company, for example. If we were an IT company, we would probably need to pay for extra support or instead go for another software solution. But as it is, we don't have any need for high-end troubleshooting tools."

"It's an open-source solution. Commerically, only the support service is available."

"It's an open-source product, and I haven't seen any premiums. Options are available for those who purchase, but for my use case, everything I need is available in the community and forums."

"Nmap is an open-source and free product."

"The product's pricing is fine. The licensing options for Nmap include perpetual licenses and volume-based licenses. For perpetual licenses, once you purchase it, there's no need to invest in renewals. And for volume-based licenses, enterprise companies can use it multiple times based on the number of users or devices they need to scan. It's a pay-as-you-go model, similar to how you pay for what you use."

More Nmap pricing and cost advice

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Top Industries

By visitors reading reviews

Manufacturing Company

10%

Computer Software Company

10%

Comms Service Provider

Government

Manufacturing Company

13%

Government

10%

University

Retailer

Company Size

By reviewers

Large Enterprise

Midsize Enterprise

Small Business

By reviewers
Company Size	Count
Small Business	20
Midsize Enterprise	11
Large Enterprise	23

By reviewers
Company Size	Count
Small Business	9
Midsize Enterprise	1
Large Enterprise	11

Questions from the Community

What is your experience regarding pricing and costs for Nagios Core?

Nagios Core is a free and open-source product. We don't charge for the product itself, but we charge for the man-hour costs related to installation, configuration, ongoing operation, and maintenance.

What needs improvement with Nagios Core?

The dashboard should be improved. It's very simple. I don't have a very clear or specific suggestion. You can change the skin of the dashboard, however, it's good for me.

What is your primary use case for Nagios Core?

I was a senior system administrator. I've been using Nagios Core for more than ten years now. It can be used to monitor hosts, such as machines, and monitor services of any kind. I'm using it to mo...

What do you like most about Nmap?

What is your experience regarding pricing and costs for Nmap?

I am using the free version of Nmap.

What is your primary use case for Nmap?

Nmap is used for network scanning to map the network, identify devices, and assess their status. It helps determine open ports and services running on a particular endpoint or server within an ente...

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Product Reports

Nagios Core

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Download Nmap product report

Overview

This is IT infrastructure monitoring's industry-standard, open-source core. Free without professional support services.

Nagios

Nmap ("Network Mapper") is a free and open source (license) utility for network discovery and security auditing. Many systems and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime. Nmap uses raw IP packets in novel ways to determine what hosts are available on the network, what services (application name and version) those hosts are offering, what operating systems (and OS versions) they are running, what type of packet filters/firewalls are in use, and dozens of other characteristics. It was designed to rapidly scan large networks, but works fine against single hosts. Nmap runs on all major computer operating systems, and official binary packages are available for Linux, Windows, and Mac OS X. In addition to the classic command-line Nmap executable, the Nmap suite includes an advanced GUI and results viewer (Zenmap), a flexible data transfer, redirection, and debugging tool (Ncat), a utility for comparing scan results (Ndiff), and a packet generation and response analysis tool (Nping).

Sample Customers

Airbnb, Cisco, PayPal, FanDuel

Lockheed Martin, Eastern Bank Boston, Perspecta, Harris Corporation, Discovery Communication

Nagios Core vs. Nmap