A simple port scanner
HTTP, FTP, Port scanner
I want a simple port scanner which display the open ports and their purpose of all the systems that are up in a LAN. Question
HTTP, FTP, Port scanner
I want a simple port scanner which display the open ports and their purpose of all the systems that are up in a LAN. 
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There is no guarantee that specific ports are used for specific things. While port 80 is usually used for web site traffic, there is no guarantee that it's used for web site traffic. Any application can be configured to use any port number. There are some basic ports to be aware of.
21 - FTP
22 - FTP Data Transfers
22 - SSH
23 - Telnet
25 - SMTP
53 - DNS
110 - POP3
137-139 - Windows File Shares
80 - HTTP
443 - HTTPS
1433 - SQL Server
1521 - Oracle
3389 - RDP
A very complete list of port numbers can be found here.
GFI appears to have a network port scanner.
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Hadden | Mar 15 2008 1:40PM GMT
My favorite is Angry IP Scanner (http://www.angryziber.com/w/Home). It will identify all the devices on your LAN as well as scan ports.
Wrobinson | Mar 17 2008 1:56AM GMT
SuperScan by Foundstone is a simple network scanner that is a self-contained executable. You can get it from http://www.foundstone.com/us/resources/proddesc/superscan4.htm.
