Пинг порта через командную строку windows

One of the things I do the most when troubleshooting deployments of services exposing data to the internet is pinging the IP and port where the service is supposed to be alive. In this tutorial, I will show you how to ping IP and port on Linux and Windows.

I think most system administrators know the commands for this, but if you like me normally don’t work like an IT admin (at least not anymore) I tend to forget the commands. Due to that, I have written this article as a reference for myself but also for everyone else, who is in need of pinging services they expect at a location.

Often it’s enough to just ping an IP to validate that you got “life” on the server. However if you like me often got many services running on one server (often when using Docker), I need to ping the specific port number on the server. One of the Kubernetes clusters I manage is running more than 100 services and here I use it a lot.

In this article/reference post, I will show you how to ping IP and port on your Windows or Linux machine using different commands in the terminal (CLI).

Ping IP and port using Telnet

This is my favorite when working on both Windows and Linux. I also think that it’s the easiest one to use and it’s called Telnet. You can with a simple command using Telnet ping IP and port on the remote server you would like to check.

If you want to, you can also use a domain instead of the IP. A domain is often easier for humans to remember instead of numbers to multiple different servers locally or externally.

Below are the commands to ping IP and port on a server using Telnet:

$ telnet <server_ip_address> <server_port_number>

$ telnet <server_domain_name> <server_port_number>

As I mentioned above, you can use Telnet on both Windows and Linux computers/servers which makes it a great choice for most sys-ops.

On most computers, telnet is not installed by default. If you get the annoying error “telnet: command not found”, you have to install Telnet on the machine using the commands below:

Install Telnet on Linux

If you are working on a Linux Server or Desktop, you can use the below command to install Telnet on that machine:

$ sudo apt install telnet

Install Telnet on Windows

By default, Telnet is not an enabled Windows Feature. If you run Telnet on your computer in a Command Prompt, you will get the following error: “Telnet is not recognized as an operable program or batch file.”. So – to install Telnet on Windows, you have to do the following:

1. Click on Start.
2. Select Control Panel.
3. Choose Programs and Features.
4. Click Turn Windows features on or off.
5. Select the Telnet Client option.
6. Click OK.
   A dialog box appears to confirm installation when it’s done. The telnet command should now be available in your Command Prompt. Remember to restart your CMD window.

Ping IP and port with Telnet example

Let’s check out how Telnet works. This website is running at IP: 172.67.161.26 – this is the public IP address of the website to which the domain is mapped to.

By default, all requests are redirected to HTTPS (port 443) if a request is made at port 80. This means that the server accepts connections on port 80 too – let’s try and ping both ports:

$ telnet 172.67.161.26 80

Trying 172.67.161.26...
Connected to 172.67.161.26.
Escape character is '^]'.

$ telnet 172.67.161.26 443

Trying 172.67.161.26...
Connected to 172.67.161.26.
Escape character is '^]'.

That went well. We got connected and could see that the server is responding on both ports. This simply means that the service on the port is up and running.

If you would like to escape out of the Telnet utility when connected, you can use “CTRL + ]” or the “q” command.

Ping IP and port using Nmap

Another well-used tool is Nmap. In Nmap, you can ping a port by using the “-p” option including the IP or domain you would like to scan.

$ nmap -p <server_port_number> <server_ip_address>

$ nmap -p <server_port_number> <internet_domain_name>

A heads up – be aware of legal issues!

“When used properly, Nmap helps protect your network from invaders. But when used improperly, Nmap can (in rare cases) get you sued, fired, expelled, jailed, or banned by your ISP.” – Nmap website.

If you get an error telling you that Nmap is not available on your computer/server, you would have to install it.

Install Nmap on Linux

To install Nmap on your Linux machine, you can use the below command:

$ sudo apt install nmap

Install Nmap on Windows

Not as simple as Linux, but it’s still easy to use the official installer from Nmap’s website. Go to this page: Download Nmap and look under the Windows Binaries for the latest available installer file.

Once the installer has completed installing, you are now ready to use Nmap on your Windows computer.

Ping IP and port using Nmap

Let’s try to ping a website at IP “172.67.161.26” on the global internet at the default HTTPS port – 443. If you test this yourself, then don’t use that IP. Cloudflare is protecting the website and will block your access and in the worst-case ban your IP from their global network. Only do this at IPs you own or services that won’t do any damage to others.

C:\Users\christian>nmap -p 443 172.67.161.26
Starting Nmap 7.92 ( https://nmap.org ) at 2022-02-10 06:50 Romance Standard Time
Nmap scan report for 172.67.161.26
Host is up (0.028s latency).

Well, once again the port is returned as open on the server. This means that there is a service accepting data at port 443, which was just verified by Nmap.

Ping IP and port using PowerShell

Normally when I’m not on my own machines, which means I’m working on production servers not related to my own business/platform and it’s a Windows Server Environment, I always use PowerShell to ping IP and port.

A great thing about PowerShell is that you can use the methods in scripts running automated stuff in the background or during the setup of service or multiple services. A great thing if deploying with PowerShell would be to check if the ports were active after deployment and return a status to the terminal.

In PowerShell, we got something called Test-NetConnection which is a command where you specify either an IP or a domain followed by the port you would like to ping.

PS C:\Users\christian> Test-NetConnection <server_ip_address> -p <server_port_number>

Below is an example of what this would look like on a local network:

Windows PowerShell
Copyright (C) Microsoft Corporation. All rights reserved.
                                                                                                                                                                                                                                                                             PS C:\Users\christian> Test-NetConnection 192.168.1.1 -p 80                                                                                                                                                                                                                                                                                                                   ComputerName     : 192.168.1.1
RemoteAddress    : 192.168.1.1
RemotePort       : 80
InterfaceAlias   : Wi-Fi
SourceAddress    : 192.168.1.68
TcpTestSucceeded : True

In the test above you can see that the TCP call to my gateway at home succeeded at port 80. If you can’t get through to the service you will status False in TcpTestSucceeded.

Summary

In this quick article on how to ping IP and port using different tools on Windows or Linux machines, we learned how we can use the terminal to check if a given port is open and accepting requests.

If you got any issues, questions, or suggestions, please let me know in the comments below. Happy pinging!

Ping is one of the most fundamental tools when it comes to network troubleshooting. It allows you to quickly test whether a given service/port is responding or not. Due the lightweight nature of ICMP packets, it allows ping to quickly fetch useful information about a given system without sending a series of packets that would otherwise overwhelm the host (in some cases).

Although pinging an entire host can be useful for checking if a given host is up, it does not offer much information about if a target port is up.

Method 1 — Use Telnet

You are probably familiar with telnet. Also known as Terminal or Network, Telnet is a command-line utility that allows you perform interactive network communication using the TELNET protocol.

An telnet tutorial is coming up soo. Stay tuned for that.

To ping a specific port using telnet, use the command syntax as:

telnet [ip_address] [port_number]

The telnet command is available in both Windows and Unix systems. However, you may need to enable Telnet in Windows.

To learn how do that, check the link below:

https://geekbits.io/how-to-enable-telenet-in-windows

On macOS, use brew to install Telnet:

brew install telnet

On Debian and Debian-Based distributions, install telnet:

sudo apt-get install telnet

The example below shows how to use telnet to check if Nginx Server is running.

telnet 67.205.166.236 80

If the service is running, telnet will connect and return an output as:

Trying 67.205.166.236...
Connected to 67.205.166.236.
Escape character is '^]'.

To close the connection, press CTRL + C]

Method 2 — Using Nmap

Nmap is another ‘crazy’ networking tool that every sys admin and security researcher should use. We will be putting out nmap tutorials in a near future. Make sure to subscribe to get notified when we do.

Start by installing nmap:

sudo apt-get install nmap

On macOS:

brew install nmap

REHL:

sudo yum install nmap

Once installed, check if a port is up by running the command:

nmap -p <port> [target_address]

Example:

sudo nmap -p 80 67.205.166.236

Nmap will return detailed information including the latency, port number, associated service and its state. An exmaple output is as shown:

Starting Nmap 7.93 ( https://nmap.org ) at 2022-10-02 10:49 EAT
Nmap scan report for 67.205.166.236
Host is up (0.28s latency).

PORT   STATE SERVICE
80/tcp open  http

Nmap done: 1 IP address (1 host up) scanned in 0.65 seconds

Method 3 — Using Netcat

Netcat is another tool you can use to check if a port is up. Check the nectat cheat sheet to learn more.

https://www.geekbits.io/netcat-command-cheat-sheet/

To ping a port using netcat, run the command:

nc -vz [target_address] [port_number]

Example:

sudo nc -zv 67.205.166.236 80
Connection to 67.205.166.236 port 80 [tcp/http] succeeded!

We can see that the connection to the target address and port is successful. This indicates the port/service is up.

Method 3 — Using cURL

We obviously cannot forget to mention cURL in this list. The command syntax is as shown:

curl -s [host:port]

Example:

curl -s 67.205.166.236:80 >/dev/null && echo Connected. || echo Failed.

The command should «Connected» if the port/service is up.

Method 4 — Using Windows PowerShell

In Windows, you can use the Test-NetConnection cmdlet to test if a port is up and running. The command syntax is as shown:

Test-NetConnection [ip_address] -p [port_number]

Example:

Test-NetConnection 67.205.166.236 -p 80

The command should return details about the target host and the connection status.

ComputerName     : 67.205.166.236
RemoteAddress    : 67.205.166.236
RemotePort       : 80
InterfaceAlias   : Ethernet
SourceAddress    : 192.168.1.101
TcpTestSucceeded : True

Method 5 — Using PsPing Utility

In Windows, you can also use the  PsPing utility which is part of Windows SysInternals tools. Download the tool in the resource below:

https://download.sysinternals.com/files/PSTools.zip

You can then use the command synax below to ping a specific port:

psping [address:port]

Example:

psping.exe 67.205.166.236:80

The command should send ping request to the target address and port and return the output as shown:

PsPing v2.10 - PsPing - ping, latency, bandwidth measurement utility
Copyright (C) 2012-2016 Mark Russinovich
Sysinternals - www.sysinternals.com

TCP connect to 67.205.166.236:80:
5 iterations (warmup 1) ping test:
Connecting to 67.205.166.236:80 (warmup): from 192.168.1.101:59835: 239.30ms
Connecting to 67.205.166.236:80: from 192.168.1.101:59837: 239.56ms
Connecting to 67.205.166.236:80: from 192.168.1.101:59838: 239.36ms
Connecting to 67.205.166.236:80: from 192.168.1.101:59839: 237.90ms
Connecting to 67.205.166.236:80: from 192.168.1.101:59842: 237.86ms

TCP connect statistics for 67.205.166.236:80:
  Sent = 4, Received = 4, Lost = 0 (0% loss),
  Minimum = 237.86ms, Maximum = 239.56ms, Average = 238.67ms

The above port is up.

Conclusion

In this post, we explored various methods and tools you can use to ping a specific port in both Windows and Unix based systems.

Thanks for reading and catch you in the next one!!