Learn how to use netstat commands to watch open ports. Using the –b, -o, -an, interval, and tasklist commands, you can find IP addresses, port numbers, connections, process IDs and associated ...

Because TCP and UDP port numbers are 16 bits in length, they fall in the range of 0 to 65,535, which are the smallest and largest decimal equivalents of the binary numbers that fit inside a 16-bit ...

Freeware PortExpert lets users check all active TCP, UDP ports on Windows. Freeze time, Whois, System Process are few other features this tool has to offer.

Zone transfers take place over TCP port 53 and in order to prevent our DNS servers from divulging critical information to attackers, TCP port 53 is typically blocked.

Summary TCP and UDP port numbers are very important in networking in general and when working with the Cisco IOS.

Test if Firewall is blocking a Port. Check which Ports are being used. Also learn how to check which process or service is using the open port.

<p>As with any network and internet-capable computing system, many of Apple's services and programs require access to the internet and/or local network using TCP and UDP ports to function properly ...