Nmap Online Port Scanner

Test servers, firewalls and network perimeters remotely with this online version of the Nmap port scanner. It is simply the easiest way to perform an external port scan.

Nmap is a powerful open source port scanner that will find open ports and discover services that are listening on Internet connected systems.

Launch Nmap Port Scan

Perform a quick port scan with our hosted version of the Nmap Port Scanner. This scan will test the most common 6 ports with version detection enabled.

Login to access all options

Membership is required for access to all features, including scanning all ports, ranges of IP addresses and IPv6. Immediate access is available to new members or login now if you already have an account.

  • Test for presence of both network or host based firewalls.
  • Audit external facing IP addresses for poorly configured firewall rules.
  • Troubleshoot network issues with Internet facing services.
  • Detect unknown services and operating system versions.
  • Test IPv6 enabled systems for valid firewall configurations.
  • Upload a list of scan targets in bulk through the easy to use web interface.

In the network security world, Nmap is the king for fingerprinting systems and services over the network.

Using Nmap online has many possible use cases. For example:

  • Audit external firewall configurations
  • Discover open ports and services from an attackers perspective
  • Troubleshoot network and port forwarding configuration
  • Easily find listening hosts and services on an entire netblock
  • Use the IPv6 option to test firewalls and ports on IPv6 deployments

Advantages of a remote Nmap port scan over a local installation:

  • Defences such as firewalls / IDS and network configurations (NAT) will affect outbound port scans of your perimeter. Provides a more accurate picture of your Internet facing perimeter or systems.
  • Simply convenient. No need to have port scanning software installed locally, start scans from any device with a browser.
  • It's faster. Our servers are optimized for port scanning and on fast networks. Get results fast.
  • Test security monitoring and IDS / IPS systems, with external scans from a known IP address
  • .

Automated Nmap Scanning allows you to detect changes to systems, firewalls and networks with a daily or weekly automated port scan

For system administrators, network engineers and security professionals having access to an online port scanner that is remotely hosted will be a tool you wondered how you got by without it. With easy access to an external port test when troubleshooting or security testing.

How does the Online Port Scanner work?

1. Fill out the form; entering the address or hostname of the target.
You must enter a public IP address or hostname that is accessible from an external perspective and one that you have permission to scan. The online port scans can also be initiated by submitting a list of valid target addresses, simply include the targets comma separated or a list with line breaks.

Scan a single IP address

Scan a range of IP addresses

Scan a single Hostname

2. Decide on which ports you wish to scan
The port options available are an Nmap Fast scan (-F), the default ports or to scan all 65535 ports on an IP Address. Scanning all ports is the most accurate and reliable way to discover every listening service and fully test a firewall configuration.

3. Select options you would like to use (optional)

  • Default protocol is IPv4, select the Protocol option to enable IPv6 (nmap option -6)
  • Ping is performed by default to ensure system is responding, select option to disable the ping (nmap option -Pn)
  • Enable OS Detection to probe the Operating System version (nmap option -O)
  • Perform an optional Traceroute uses results from the port scan to find the most accurate method (nmap option --traceroute)

4. Enter email address for delivery of the results
Reports are delivered once they are completed, usually this will take only a few minutes. Of course if you are scanning an entire class C with all 65535 ports it will take a bit longer! Emailed reports contain normal text based output from Nmap as well as a HTML version of the results.

Technical details of the Online Nmap Scan

The system will perform the port scan using a TCP SYN based Nmap port scan with version detection enabled (nmap -sV). Any selected optional parameters will be included.

The results are emailed to the selected destination address once the scan is completed. Emailed results are in text output in the body of the email with HTML results included in an attachment.

Most scans will take 1 or 2 minutes, however a scan of /24 network will obviously take longer perhaps 20 to 30 minutes depending on the network being scanned.

IPv6 capable port scanner

It is important to understand that as systems are moved to IPv6 based addressing; the Internet facing IPv6 addresses must be tested for open ports. It is quite likely that a firewall that is configured to protect an IPv4 addressed system is not configured or even able to filter IPv6 traffic.

The IPv6 feature of the Online Nmap Port Scanner is one that will become more and more important as the world starts to move towards an IPv6 connected future.

About the Nmap Port Scanner Software

Nmap is a network port scanner that tests network connectivity between different hosts and services. Firewalls, Router ACL’s and other factors can impact a network based connection.

Initially it was a simple but powerful tool that enabled the scanning of networks or individual hosts to determine if there any services running and if any firewall is present. More recent versions of Nmap have extended capability to include a built in scripting language (NSE) that will perform a multitude of additional checks against any services found to be open. This is pushing Nmap into the realms of a fast light weight vulnerability scanner.

Download nmap from insecure.org, it is available in versions for Windows (XP, 2003, 2008) and Linux / FreeBSD. Zenmap is a graphical front end for the gui minded. I encourage you to download from here as it is the latest versions whereas the version in the Ubuntu, Suse, Fedora and other Linux repositories is not necessarily up to date.

An interesting side note is that Nmap is the quite famous, having appeared in a number of movies including the Matrix, Die Hard 4 and many others.

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