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What is Nmap?

Nmap is a free and open-source network discovery and security auditing tool. The Nmap security scanner can rapidly scan large networks to determine which hosts are available, what services and applications those hosts are offering, what operating systems and versions they are running, and other network characteristics. Nmap provides a range of advanced techniques for mapping out networks filled with firewalls, routers, and other obstacles. The Nmap project aims to help make the internet more secure while providing network administrators and security professionals with an advanced tool for exploring and auditing their networks.

Who Uses Nmap?

Network mapping solution designed for small and medium businesses that helps with host monitoring, host availability, network scanning, data transfer, and more.

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Reviews of Nmap

Average score

Overall
4.8
Ease of Use
4.1
Customer Service
3.6
Features
4.6
Value for Money
4.8

Reviews by company size (employees)

  • <50
  • 51-200
  • 201-1,000
  • >1,001

Find reviews by score

5
81%
4
17%
3
2%
Sarath
Sarath
Android Developer in India
Verified LinkedIn User
Computer Software, 2–10 Employees
Used the Software for: 2+ years
Reviewer Source

The Best Network Scanner I Ever Used.

5.0 5 years ago

Comments: Nmap is the first tool i use to scan any network , because i am really used to it and i really like how it works. We use Nmap to scan and find out the computers are connected to our network and find open ports and its been really easy becuase of nmap.

Pros:

With a simple scan of our network using Nmap will return all the computers and devices that are in the network. We get all the IP Address of the Computers By Scanning the network. And i really like that we can find open ports in our networks using. There are lots of different types of scan that we can do on our network using Namap, And there is a feature that i like which is we can find out which operating system are they using from their IP Address.

Cons:

Nmap is really great. But there is learning curve, It takes time to understand how it works , like we need some time to get used to its commands in order to get the real use out of nmap. Sometimes It takes longer than we expected to finish the scan, but we can alter the commands and change it to some specific type of scanning to make the scan more fast.

Thusitha
Information Security Analyst in Sri Lanka
Computer & Network Security, 51–200 Employees
Used the Software for: 2+ years
Reviewer Source

Alternatives Considered:

The Best Network Scanner Ever

5.0 5 years ago

Comments: This is the best tool I ever had to do network scanning. It was very easy to understand and detect vulnerable ports, hosts and IP addresses of our customers.

Pros:

We can do lots of scans using this simple tool. There are different types of scans available (ex: - Ports scan, Host discovery etc.).

Cons:

It is suitable for beginners as well as professionals. But, it will take time to understand what are the functionalities of Nmap

Verified Reviewer
Verified LinkedIn User
Computer Software, 11–50 Employees
Used the Software for: Free Trial
Reviewer Source

basic tool that gives you the basics

3.0 5 years ago

Comments: basic tool ,that gives you the basics ,
Nothing more and nothing less,
The fact that it is for free can contribute to the fact im using it but there are better tools that are free and far better.

Pros:

free ,quick and gives you the basic network features.

Cons:

gui is far from being defined as "readable"

Maha
Assistant Professor in US
Computer Software, 501–1,000 Employees
Used the Software for: 2+ years
Reviewer Source

Nmap: Time-tested penetration testing tool for network security

4.0 9 months ago

Comments: Great penetration testing tool. A necessary tool to use in any network security discipline.

Pros:

I used Nmap to simulate many network attacks on servers and operating systems as part of my cryptography and network security courses. We usually test DoS flooding, fingerprinting, and port scanning attacks to stand on the hardness of a victim server and the vulnerabilities in its operating system and networking stack. Syn flooding attacks using TCP and UDP flooding attacks can be easily tested using basic command in nmap, even constructing customized TCP/IP packet structures can be a very basic task using nmap. I like that nmap is almost present by default in main Linux distributions. It is open-source and can be used after being acquainted with the command structure.

Cons:

Would be very glad to see a GUI version for nmap to make using it a bit more facilitated for non-technical people. However, simple references on the different commands in nmap can be found almost everywhere over the internet.

Tushar
Tushar
Lead security Engineer in India
Verified LinkedIn User
Information Technology & Services, 51–200 Employees
Used the Software for: 2+ years
Reviewer Source

Alternatives Considered:

Best network discovery tool

5.0 last year

Pros:

Nmap has excellent discovery tools and nmap script engine makes nmap the best tool not only for network discovery but also for asset management, for network perimeter security by checking different ports and protocols exposed and for reconnaissance.

Cons:

Reporting for nmap can be a lot better as right now it only supports generating XML files. Reporting features must include variety of different formats like printing out a whole network map etc.

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