How can I test a port using the curl command in Linux?

1 year ago
Noah Thompson
2 minutes

In Linux, you can use the curl command to test ports. Here is how you can test ports using the curl command:

  1. Use the following command to test the TCP port:
  2. Open a telnet connection to the specified hostname and port using curl.
  3. Replace with the name or IP address of the target host, and replace with the target port number. For example, to test port 80 on the host example.com, you can use the following command:
  4. Connect to example.com on port 80 using the curl command.
  5. Test the UDP port using the following command:
  6. retrieve data from a specific host and port over the UDP protocol using cURL.
  7. Replace with the name or IP address of the target host, and replace with the target port number. For example, to test port 1234 on the host example.com, you can use the following command:
  8. Fetch data from example.com using the UDP protocol on port 1234.

Note that the curl command by default uses the TCP protocol; if you want to test a UDP port, you need to add the -U or –udp option.

Additionally, you can use the nc command (also known as netcat) to test ports. Here is the method for testing ports using the nc command:

  1. Test the TCP port using the following command:
  2. Check for connectivity to a specified hostname and port by using the command “nc -vz “.
  3. Replace with the name or IP address of the target host, and replace with the target port number. For example, to test port 80 on the host example.com, you can use the following command:
  4. Check if there is connectivity to example.com on port 80.
  5. Test the UDP port using the following command:
  6. Check the connectivity to the specified host and port using the netcat tool.
  7. Replace with the name or IP address of the target host, and replace with the target port number. For example, to test port 1234 on the host example.com, you can use the following command:
  8. Check if there is an active connection to example.com on port 1234.

The above shows how to test ports using the curl command and nc command. Choose one method according to the actual situation.

bannerAds