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Can’t tell you how many times I have had to explain a TCP port being open does not equal UDP, and vice versa.Anyways, thanks for including the powershell info that is what brought me here.Copyright © 2019 - devconnected. Port check - Tests if TCP port is opened on specified IP. The ping command sends packets of data to a specific IP address on a network, and then lets you know how long it took to transmit that data and get a response. One of the biggest perks of Telnet is with a simple command you can test whether a port is open. Used by system administrators on a daily basis, the ping command, relying on the ICMP protocol, retrieves operational information about remote hosts.However, pinging hosts is not always sufficient : you may need This specific port might be related to a database, or to an Apache web server or even to a proxy server on your network.You can also specify a domain name instead of an IP address followed by the specific port to be pinged.As an example, let’s say that we have a website running on an Apache Web Server on the 192.168.178.2 IP address on our local network.By default, websites are running on port 80 : this is the specific port that we are going to ping to see if our website is active.Being able to connect to your remote host simply means that your service is up and running.In order to quit the Telnet utility, you can use the “Ctrl” + “]” keystrokes to escape and execute the “q” command to quit.You can also specify a domain name instead of an IP address followed by the port that you want to ping.If the “nc” command is not found on your system, you will need to install by running the “apt-get install” command as a As an example, let’s say that you want to ping a remote HTTP website on its port 80, you would run the following command.As you can see, the connection was successfully opened on port 80.On the other hand, if you try to ping a specific port that is not open, you will get the following error message.If the “nmap” command is not available on your host, you will have to install it.As an example, let’s say that you want to ping the “192.168.178.35/24” on your local network on the As you can see, the port 389 is said to be open on this virtual machine stating that an OpenLDAP server is running there. All rights reservedSave my name, email, and website in this browser for the next time I comment. The reply from Google is “Now, let’s try to “ping” (connect) to a random port (e.g 12345) which is probably closed:As you can see from above, port 12345 does not respond to our telnet request which means it’s closed.I have explained what NMAP is and how to use it in the articles Basically with nmap you can send TCP packets to specific remote ports and listen to the reply packets to verify if the port is open or closed.Let’s use nmap to see if port 53 (DNS) is listening on the Google DNS service (IP address 8.8.8.8)Starting Nmap 7.70SVN ( https://nmap.org ) at 2019-09-16 13:16 EDTAs you can see from above, port 53 (DNS) is open on the remote server (8.8.8.8).Similar to Telnet, we can use NC to send TCP packets to a destination port and see if the port is open:Make sure to use the “-v” switch in order to get verbose output from the netcat command. Ports belong to the transport layer protocols like TCP and UDP. I think a quick restructure of the article would clear this up and help promote people using the correct terminology. Also, pointing out that people should understand the difference between UDP, TCP, and Ping with a quick example. Again, if we try to scan a port range on the “192.168.178.35/24”, we would run the following commandIf you are running a computer in a Windows environment, you can ping specific port numbers using Powershell.This option can be very useful if you plan on including this functionality in automated scripts.As an example, let’s say that we want to ping the “192.168.178.35/24” host on the port 389.To achieve that, we would run the following commandOn the last line, you are able to see if the TCP call succeeded or not : in our case, it did reach the port on the 389 port.Sending a “ping” request to a remote host means that However, it is extremely common for engineers to state that they are “pinging a port” but in reality they are either scanning or opening TCP connections.In this tutorial, you learnt all the ways that can be used in order Most of the commands used in this tutorial can be used on They might not be directly available to you, but you will be able to find free and open source alternatives for your operating system.No no no no no no no no no no no no no no no no no no.The post is actually useful and well documented, but the title and the name of the paragraphs…I have actually made it very clear that there is no such thing as “pinging a port”.First, you have good information on how to test tcp connectivity to specific port.However, to the point of the other commentor’s, it is misleading to have the majority of article reinforce the idea that you can “ping a port” and then end with it isn’t technical possible. As shown above, port 80 is open on Google.So here you go, three different ways to “ping a port” and check if it responds or not. Primarily the difference between UDP and TCP.