Port Scanner 4.0

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NetworkActiv Port Scanner is a network exploration and administration tool that allows you to scan and explore internal LANs and external WANs. Because of the versatility and choosable operating modes available in NetworkActiv Port Scanner, it may be used by experienced network administrators as well as by novices. NetworkActiv Port Scanner provides all the basic features that you'd expect in an advanced network scanner, but also provides many additional features and technologies, some of which being completely unique to this scanner. NetworkActiv Port Scanner provides scanning performance simply not found in other Windows based network scanners, but one will need to actually try it to understand just how fast a network scan can be.


Why a port scanner and a subnet scanner are important

A port scanner is a utility used to find open ports on an IP address (host), ports that are open on a host represent services, servers, and sometimes internet applications (possibly trojans), therefore a port scanner can inform you of such services, servers, etc. running on a local or remote system. port scanners may assist you in the detection of trojans and other unwanted servers/applications.

A subnet port scanner is a utility used to find computers at a given IP subnet with a given port open. A subnet port scanner may allow network administrators to quickly check large numbers of computers on a network. The subnet port scanner included in NetworkActiv (Port) Scanner includes the following features:

What else can be done with ports?

Sometimes you may want to mimic or duplicate the services available from one server on another computer. For example, if computer A can connect to computer B but not to computer C, and if computer B can connect to computer C, then computer B can run what is called a port forwarder (also known as a port mapper) to allow computer A to access the service running on computer C. Essentially, computer B mimics, or proxies, a particular service running on computer C. This scenario is particularly prevalent when running server software on computers or other machines in LANs where the local machine itself is not directly connected to the Internet. The port forwarding runs on the gateway machine, which may be a broadband router, or it can be a PC with Internet Connection Sharing (ICS) enabled.

Another case that arises is where a port on an internal computer needs to be accessed from across the Internet, but where the internal computer has no direct inbound pathway available. A port tunnel can be used to access those internal ports without the need for any gateway-based port forwarding. Even though a port scanner would be unable to connect to these ports directly from across the Internet, the ports can nevertheless be accessed remotely. In fact, port tunnels can be used to access ports running on localhost ( from another computer.

If you need to know the exact program that is listening on a particular port and you happen to have access to the host computer in question, you may want to check out Microsoft's TCPView tool. This tool enables you not only to see what programs are listening on a particular port, but also to see what ports are being listened on by a particular program. While the tool requires local administrative privileges, the features are indispensable.

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Quick information

Release date: 2002.October.31

Last updated: 2002.October.31

File size: 1.51 MB

Supported OS's: Windows(c) *98/*ME/*NT/2000/*XP/*2003 Server

(*See System requirements for details)

System requirements

Windows(c) *98 / *ME / *NT / 2000 / **XP / ***2003 Server

*Certain features, such as TCP SYN scan, OS-Fingerprinting, and some others are not available on these operating systems.

**XP SP2 will not support certain features, such as TCP SYN scan, OS-Fingerprint, and some others.

***Windows 2003 may not support the UDP scanning.

A screen resolution of at least 800x600 is highly recommended.

Recent version update history

Changes since forever: