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How To Find Your Internal IP Address on Ubuntu Server

Ubuntu 13

In this tutorial, we will walk you through the steps to find your internal IP address on an Ubuntu server. This information can be useful for various networking tasks, such as setting up a firewall or configuring network services.

Quick Answer

To find your internal IP address on an Ubuntu server, you can use the ip addr command to display all network interfaces and their corresponding IP addresses. Alternatively, you can use the hostname -I command to quickly retrieve the IP address without any additional information. If the ifconfig command does not work, you may need to install the net-tools package.

What is an Internal IP Address?

An internal IP address is a unique identifier for your computer on a local network. Unlike your public IP address, which is visible to the entire internet, your internal IP address is only visible to other devices on the same network.

Checking IP Address Using ip addr Command

One of the easiest ways to find your internal IP address on an Ubuntu server is by using the ip addr command. This command displays information about all network interfaces on your server.

Open a terminal and run the following command:

ip addr

The output will list all the network interfaces on your server. Look for the interface you are interested in (usually eth0 for wired connections or wlan0 for wireless). The IP address will be listed under the inet section.

The ip addr command is part of the iproute2 package, which comes pre-installed on most modern Linux distributions, including Ubuntu.

Filtering IP Address

If you want to filter the output to only display the IP address, you can use the awk and cut commands to parse the output.

Here’s the command:

ip addr show eth0 | awk '/inet / {print $2}' | cut -d/ -f1

In this command, awk filters the output of ip addr show eth0 to only lines containing inet. Then it prints the second field (denoted by $2) of each line, which contains the IP address and the subnet mask. Finally, cut is used to split the field by the slash (/) and only display the first part, which is the IP address.

Using hostname -I Command

Another quick way to get your IP address without any extra information is by using the hostname -I command.

Open a terminal and run the following command:

hostname -I

This command will display the IP address of your server without any additional details.

If ifconfig Command Does Not Work

If the ifconfig command does not display the IP address, it might be because the net-tools package is not installed. You can install it using the following command:

sudo apt-get install net-tools

Once installed, you can use the ifconfig command to check the IP address.

Conclusion

Finding your internal IP address on an Ubuntu server is a straightforward task. You can use the ip addr or hostname -I commands to quickly find the IP address. If you need to parse the output or filter it to only display the IP address, you can use tools like awk and cut.

Remember that your internal IP address is a crucial piece of information for many networking tasks, so it’s important to know how to find it quickly and efficiently.

What is the difference between an internal IP address and a public IP address?

An internal IP address is a unique identifier for your computer on a local network and is only visible to other devices on the same network. On the other hand, a public IP address is visible to the entire internet and is used to communicate with devices outside of your local network.

How can I find my internal IP address on an Ubuntu server?

To find your internal IP address on an Ubuntu server, you can use the ip addr command in the terminal. This command displays information about all network interfaces on your server, including the IP addresses. Look for the interface you are interested in (e.g., eth0 for wired connections or wlan0 for wireless), and the IP address will be listed under the inet section.

Can I filter the output of the `ip addr` command to only display the IP address?

Yes, you can filter the output of the ip addr command using the awk and cut commands. For example, you can use the following command to filter the output and display only the IP address: ip addr show eth0 | awk '/inet / {print $2}' | cut -d/ -f1. This command will parse the output and extract the IP address from the inet section.

Is there a quicker way to get my IP address without additional details?

Yes, you can use the hostname -I command in the terminal to quickly get your IP address without any extra information. This command will display the IP address of your server directly.

What should I do if the `ifconfig` command does not work?

If the ifconfig command does not display the IP address, it might be because the net-tools package is not installed. You can install it using the command sudo apt-get install net-tools. Once installed, you can use the ifconfig command to check the IP address.

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