Security practitioners for decades have advised people to limit DNS queries against their DNS servers to only use UDP port 53. The reality is that DNS queries can also use TCP port 53 if UDP port 53 ...

IntroductionRecently, I have been using Nmap to study security and check which ports are open on servers.For example,22/tcp ...

Dynamic Host Configuration Protocol plays a critical role on your network. It enables client devices, such as workstations, tablets and smartphones, to lease IP address configurations. DHCP frees ...

When ports are being discussed, the focus most of the time is on the well-known web ports 80 and 443. But, as security admins know, many other Internet Assigned Numbers Authority ports are in use. One ...

The following list of port numbers comprises information derived mainly from RFC 1700. Any errors or omissions are, therefore, my own. The port numbers are divided into three ranges, as follows: ...

Windows standard Remote Desktop (RDP) uses port 3389 by default.However, RDP exposed to the internet can be subject to ...

Run the command "netstat -ab" in an elevated Command Prompt, PowerShell, or Terminal window to see a list of applications and their associated ports. Checking open ports can be done using built-in ...

You can connect multiple printers to a single computer in your office and use them to print business documents in various formats. Your computer communicates with each printer on your office network ...