Online port scan

A complete listing of port number assignments are maintained by T1 Shopper.



A complete listing of port number assignments are maintained by T1 Shopper.



Like breeze blowing with the home windows on the house, ports are simply hardware locations employed for passing data out and in. Such as the breeze blowing interior and exterior your window, computers send information out (and receive data in) though these home windows, or ports. (To not confuse you but information technology has internal ports (allowing you to connect hard drives, monitors, keyboards, etc) in addition to exterior ports (allowing you to connect modems, printers, mouse devices, along with other add-ons). But I am not likely to geek out about internal or exterior ports, let us just make it simple here. What about a good example?

  • I am using port 80 (yes, I am an internet server computer) for delivering this web site for your internet browser. I am do that by studying the site off my disk then send it flying from my port 80, within the merry Internet, completely for your blazing fast computer. Your pc will get it via a “receiving port” (that won’t be port 80) and lastly your internet browser will browse the Web coding and display it as being the great-searching web site you are studying at this time.

Why port 80? So why do web servers use port 80? Nothing special about this number – people got together and willy-nilly made the decision that port 80 will be the default port which an internet server would distribute its content. Don’t think me? Ok, do this out: See your favorite site, let us say but rather of typing it in as if you usually would, give a “:80” following the “.com” part, such as this: Magic! You will get exactly the same web site even though you specify the main harbour number!

Online port scan to type our fingers silly

What is the benefit of getting port figures such as this? Well, with openly-decided on port numbering, entering a port number becomes optional! Yes, it’s faster – we do not have to type our fingers silly entering the main harbour number each time. Rather of we are able to just type and our computers know (due to the http prefix) that we’re requesting an internet page so it uses port 80 automatically, without us getting to types. Aren’t computers fun!

Ok, let us really geek out! Port figures happen to be split into three ranges: the well-known Ports ( through 1023), the Registered Ports (1024 through 49151), and also the Dynamic and/or Private Ports (they are very greatest ports 49152 through 65535 in most cases employed for receiving data, as with our example above). And who monitors each one of these default port figures, port lists and protocols? The Web Assigned Figures Authority. IANA not just coordinates this but additionally all of the worldwide domains and Ip assignments. They are busy. If you’re a true geek, you’ll relish the dry studying at RFC793 which provides the entire technical description of ports.

Some infections attack specific ports on your pc in their design like the old SASSER virus which used TCP port 445. To check if you may be susceptible to the SASSER virus, make use of the above port scan tool to scan port 445. When the portscan states it may cope with port 445 on whatever firewall you hopefully have, as well as your computer’s port 445 can also be open/active, you might be prone to the SASSER virus.

For an entire security/virus scan T1 Shopper suggests going to the following tools:

  • Symantec Security Check
  • ShieldsUp!
Online port scan are maintained