Nmap Online Scanner

of your computer (-F -T5 -Pn -sS
of your computer
(-p - -T4 -Pn -sS

Nmap options for custom scan

My Scan Results


Examples #

Try a few example inputs:
  • [TRY] Quick Scan

Description #

Nmap Online Scanner uses Nmap Security Scanner to perform scanning. It was designed to rapidly scan large networks, although it works fine with single hosts too. We suggest you to read the Nmap's documentation, especially the Nmap Reference Guide. You can also be interested in some examples of the Nmap's usage.

Nmap Online Scanner supports most of the functionality of Nmap Security Scanner. It can be used as a simple and fast port scanner. It can be used to get information about services that run on a computer in your network. Using Nmap Online Scanner you can discover running machines in your network and detect which operating system they are running on. It is also useful for testing firewall configurations. There are simply too many ways to use the Nmap scanner and the Nmap Online Scanner tool. This is why you should check the before-mentioned links to the documentation of Nmap, especially if it is the first time you are about to use Nmap Security Scanner or Nmap Online Scanner.

All questions related to the Nmap scanner should be sent to the authors of the Nmap scanner, not to the provider of Nmap Online Scanner. Similarly, all questions related to Nmap Online Scanner (i.e. this service and its interface) should be directed to the provider of Nmap Online Scanner, not to the authors of the Nmap scanner.

Usage #

Nmap Security Scanner is a very complex tool and this is why there are three different modes in Nmap Online Scanner. The first two modes are easy to use even for Nmap beginners. The Quick scan of your computer quickly scans the most known ports and gives you quick information about the ports and services accessible on your computer from the Internet. The Full Nmap scan of your computer is a mode in which Nmap Online Scanner scans a full range of ports that are specified within this option. This scan can take a while especially if you want to scan more than 10000 ports. In case of large port ranges and due to the service limits, it might be necessary to divide your scan into several smaller scan requests. The third mode is the Custom scan mode, which puts the whole power of the Nmap scanner into your hands. Although there are some limitations for security reasons, if your intentions are good you should be able to use the Nmap scanner for whatever you need. In the Custom mode you specify the arguments for the Nmap scanner yourself, similarly to what you would do if you were about to run Nmap Security Scanner from the command line shell.

The most common Nmap modes firstly try to use the host discovery feature and continue only if they detect that the target host is online. Many hosts, however, do not respond to ping requests and hence the required scan itself is not performed. In such a case the only result you get on the output is that the host seems to be down. If you are sure the host is up and you are only interested in the scan results and not the information about whether or not it responds to ping requests, we recommend you to use -PN option right away. In case of Quick scan and Full Nmap scan modes it is not possible to add custom options, but by selecting one of these scanning modes the Custom scan arguments are modified and then you can select the Custom scan mode and add -PN to the custom arguments.

The results will appear in your browser once they are ready. This can take some time, however. You can either wait for the results with your browser opened or you can enable the Send email notification when the scan results are ready option. This option requires you to log in using your credentials. Once the results are ready, the notification will be sent to your email. You will receive a link to a web page containing your results.

You can also view your older Nmap Online results. To access your Nmap Online history you have to log in using the form in My Scan Results section and press the "View My Scan Results" button. If the Remember me on this computer option is enabled and your browser supports cookies, a long-term verification cookie will be stored on your computer.

The history of your Nmap Online results is displayed in a table. The first column contains the time when your task started. The State value provides information about the current state of the task. Successfully completed tasks have the state set to Finished. Tasks that are still running are simply Running. Terminated tells you that for some reason your task was terminated and did not finish properly. If your task run too long and reached the limit, you will see the Timeout state. The third column displays the parameters that the Nmap task was run with. Finally, the last column contains the View link that allows you to switch to a detailed view of the task, in which the full task's output is provided.

Once your Nmap Online history is opened the list does not update automatically. Use the Reload link to refresh the list.

When you are viewing your Nmap Online history (i.e. you are logged in) your new scans will be automatically added to the history even if you have not checked the checkbox Send email notification when the scan results are ready.

Limits #

You can scan IP addresses in the C class subnet of your IP only. For example, if your IP address is, you can scan addresses from to The only allowed syntax to specify IP address is a.b.c.d or a.b.c.d-e.

No scan can take longer than 45 minutes. There can be only one active (running) scan from one IP. One IP address is allowed to execute Nmap Online Scanner no more than 10 times per day.

The Custom scan options can have up to 200 characters. For security reasons, the following Nmap options are disabled:



Nmap Online Scanner allows to run Nmap scripts, yet, for security reasons not all scripts are installed. Please see the list of currently supported scripts: [Show]

The value of --script option cannot contain a dot (.) character. This is not an issue when specifying scripts to be used since the extension ".nse" is optional.
Incorrect: --script "scriptname.nse"
Correct: --script "scriptname"
The following script arguments are disabled for security reasons in --script-args option:

Other Limits #

No Nmap Online's task can take longer than 45 minutes. One IP address is allowed to execute Nmap Online Scanner no more than 10 times per day.

See Also #