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

"You should really try Nagios; it will help a lot and I have found that it is the best buddy for system admins."

"Before we implemented Nagios, we did not know which servers were up or down until a customer told us, and now I can see trends over time and it gives me perspective of what needs to be improved so we are able to work proactively as opposed to reactively."

"Key features include the GUI interface, its notification capabilities, and the real-time reporting."

"Reliability Security Flexibility Functionality Availability - controllability anywhere and with different methods"

"The poller is really good, I can easily implement new stuff and it is scalable."

"Using Nagios, I'm managing more than 1000 services, which involves the following operating nodes: IBM AIX, Red Hat Enterprise Linux, HP-Unix, Windows enterprise-grade OS, Cisco router/switches, FortiGate and WatchGuard firewalls, APC UPS systems, and many more."

"The solution's most valuable feature is that it offers proper alerting capabilities."

"This is probably the greatest advantage of Nagios - it can be customized to a degree to suit your monitoring needs."

More Nagios Core pros

"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."

"Nmap's performance is great, and I've never noticed any issues in this respect. It really doesn't put a heavy load on the machine when using it."

"Nmap has a powerful command line tool and a set of diagnostic features."

"It is a very user-friendly product."

"The most valuable feature of the solution for security audits stems from the fact that it serves as a powerful tool with the ability to scan a large number of ports."

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

"From a functionality standpoint, it's robust and straightforward to comprehend."

"It helps us secure the network infrastructure."

More Nmap pros

Cons

"The user interface could be more interactive because it is pretty basic."

"Would benefit from aggregations if a particular server goes down."

"Making it a little easier to configure and set up from the start would help. There are multiple layers that you have to wade through to be able to set it up, to do it the right way, and to get it to do what you want it to do."

"It would be nice if it was hosted in cloud. Also, they need to improve the graphs."

"Nagios SLA. I'm currently working on Nagios Digger, which has many code-level problems."

"It is a bit slow due to latency."

"Generally, it does what I need it to do, but better error reporting would be great."

"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."

More Nagios Core cons

"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."

"The solution should increase the number of features under a free license."

"There are concerns with the stability of the product, making it an area where improvements are required."

"Nmap needs to improve its scanning speed."

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

"There could be a specific option to check non-pingable endpoints for the product."

"Nmap major operates through the CLI; there's no GUI component, and that's where the challenge is."

"The solution's initial setup could be better."

More Nmap cons

Pricing and Cost Advice

"Most the plugin features are free."

"It's free."

"Lessening the price point would be an improvement."

"Nagios Core is free to use."

"We have saved a lot of time, money, and effort in reducing disaster times, which is owed to Nagios quick alerting."

"The product is cheaply priced."

"Nagios Core is a cheap solution."

"Nagios Core is an open source solution, and there are no licensing fees."

More Nagios Core pricing and cost advice

"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."

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

"I am using the standard free version of Nmap."

"The solution is free of cost, but there are specific services that we have to buy."

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

"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."

"The solution is free of cost."

"I am using the free version of Nmap."

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

Download Nagios Core product report

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