Online Port Scanner using Nmap

Nmap Online Help

This Nmap port scanner will test your IP (and firewall) or a range of IP addresses for services that are listening on TCP ports and are open to public facing IP addresses.

Enter an IP address or range of IP addresses into the form and have those targets scanned by one of our external port scanner servers. For this reason you must enter a public IP address that is routable from an external perspective and one that you have permission to scan. The results will be emailed to you once the scan has completed.

It is possible though highly unlikely that port scanning could cause listening services to become unstable.

Enter the target IP in either of the following formats:

  • 192.168.1.5
  • 192.168.1.1-20
  • hostname.com

Note that to scan a range of IP addresses you must have a valid membership. Free users are also only able to scan the 12 most common ports. Membership allows scanning of all ports (65535) or the default nmap scan of the First 1000 TCP ports.

Would you like to have a go with running Nmap yourself? Learn some new tricks with our handy tutorial on the installation and basics of running Nmap.

This online Nmap port scanner will test your public IP address and firewall / router for open ports and is a fast and easy way to perform an external port test and discover which services are listening on your perimeter.

You must have permission to scan the IP address you nominate. It is possible for port scanning to disrupt network services and trigger Intrusion Detection Systems.

Enter the target IP / hostname or IP address range; results will be emailed immediately upon completion.

Launch Port Scanner using Nmap

Enter details to begin a port scan of your nominated IP address.
Members can portscan a range of IP Addresses and All TCP Ports.




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New service launched. Schedule daily Nmap port scans and be alerted when things change on your servers and firewalls.

About Network Port Scanners

A network port scanner allows you to test network connectivity between different hosts and services. Firewalls, Router ACL’s and other factors can impact a network based connection.

Nmap is the worlds most famous port scanner, having appeared in a number of movies including the Matrix. 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.


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