Ip address lookup in linux

How to get your IP Address on Linux

You should also know that there are two types of IP addresses : public and private. The public IP address is the address used to communicate over the Internet, the same way your physical address is used for postal mail. However, in the context of a local network such as a home where are router is used , each device is assigned a private IP address unique within this sub-network.


  • Look up IP addresses in Unix.
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  • Obtain IP address or hostname information from a Linux shell prompt.
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This is used inside this local network, without directly exposing the public IP which is used by the router to communicate with the Internet. Another distinction can be made between IPv4 and IPv6 protocol. IPv4 is the classic IP format,consisting of a basic 4 part structure, with four bytes separated by dots e. However, with the growing number of devices, IPv4 will soon be unable to offer enough addresses. This is why IPv6 was invented, a format using bit addresses compared to the bit addresses used by IPv4.

The fastest and the simplest way to check your IP address is by using the ip command. You can use this command in the following fashion:.

Unix command to find IP address from hostname - Linux example | Java67

Actually, you can further shorten this command to just ip a. It will give you the exact same result. There are some other ways to check IP address in Linux but these two commands are more than enough to serve the purpose. Long-time users might be tempted to use ifconfig part of net-tools , but that program is deprecated.

Open up the Ubuntu Applications Menu Show Applications in the bottom-left corner of the screen and search for Settings and click on the icon:. Pressing on the gear icon next to your connection should open up a window with more settings and information about your link to the network, including your IP address:. First of all, to check your public IP address used for communicating with servers etc.

Open up a terminal and enter the following command:. This should simply return your IP address with no additional bulk information.

I would recommend being careful when sharing this address, since it is the equivalent to giving out your personal address. Another simple way you can see your public IP address is by searching for ip address on Google. In this article I went through the different ways you can find your IP address in Uuntu Linux, as well as giving you a basic overview of what IP addresses are used for and why they are so important for us.

The Linux host command finds the IP address for a domain and vice versa. On its own, the host command returns a list of all the possible switches that can be used with it.

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To get the list type the following into a terminal window:. Of course, linux. Running the host command against the full lifewire. There is some further output from the host command against lifewire. Be careful about investing too much in these results. Eagle eyes surely note the discrepancy between the text of this article and the screenshot in this section.

webphajanbacktipp.cf The latter was taken several months after the former had been previously reviewed. In that time, Lifewire's servers migrated to a content delivery network such that the IP addresses appear to have changed when, in fact, merely the mechanism of content delivery changed for the better.


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The opposite of returning the IP address from a domain name is returning the domain name from an IP address. For example, we know that Type the following into a terminal window:. The host command by default returns just enough information but you can get a more detailed output by using either the -d or -v switch as follows:. The results from the above command show the domain that was looked up along with any results.

It also returns the SOA details for a domain. SOA stands for Start of Authority. If you register a domain name and then host that domain with a web hosting company , the web hosting company must maintain an SOA for that domain.