How does Linux resolve hostname?

The mechanism for name resolution in Linux is modular and can use various sources of information declared in the /etc/nsswitch. conf file. The entry that involves host name resolution is hosts . By default, it contains files dns , which means that the system consults the /etc/hosts file first, then DNS servers.

How is a hostname resolved?

Resolving host names with a hosts file Domain names or IP addresses on a local computer can be resolved by adding entries in the local hosts file on a computer. Entries in the local hosts file have the added advantage that the system can run the application server, even when disconnected from the network.

What is dynamic DNS hostname?

Dynamic DNS, or DDNS, is a service that provides a mapping between a hostname, such as, and your IP address. A device on your network communicates your IP to the DDNS service periodically. You won’t have to update all your records manually each time your IP address changes.

Which file contains the name servers to be used by the local machine for hostname resolution?

Which file contains the name servers to be used by the local machine for hostname resolution? Description – The /etc/resolv. conf file contains the domain search listing and the name servers to use for hostname resolution.

What is host name in Linux?

hostname command in Linux is used to obtain the DNS(Domain Name System) name and set the system’s hostname or NIS(Network Information System) domain name. A hostname is a name which is given to a computer and it attached to the network. Its main purpose is to uniquely identify over a network.

What is a hostname example?

On the Internet, a hostname is a domain name assigned to a host computer. For example, if Computer Hope had two computers on its network named “bart” and “homer,” the domain name “” is connecting to the “bart” computer.

How do I find the server name from an IP address?

Querying DNS

  1. Click the Windows Start button, then “All Programs” and “Accessories.” Right-click on “Command Prompt” and choose “Run as Administrator.”
  2. Type “nslookup %ipaddress%” in the black box that appears on the screen, substituting %ipaddress% with the IP address for which you want to find the hostname.

Do I need dynamic DNS?

Dynamic DNS (DDNS) is very useful if you need to access internal network services from across the Internet. It isn’t designed for hosting a business website, for that you will need standard web hosting.

How do I get a free dynamic DNS?

Go to to create your own free DynDNS account.

  1. Check your email to verify the DynDNS account that you have created.
  2. Once confirmed, login using the new DynDNS username and password.
  3. Click on Add host Services.
  4. Select your Hostname ex:

How do I create a host name?

Creating a Hostname

  1. Log in to your Dyn account.
  2. If you have already purchased Dynamic DNS, you’re able to add hostnames.
  3. You will need to think of an easy-to-remember identifier for your new hostname.
  4. Select a shared domain name to associate your hostname with.

How do I find my host name?

Using the command prompt

  1. From the Start menu, select All Programs or Programs, then Accessories, and then Command Prompt.
  2. In the window that opens, at the prompt, enter hostname . The result on the next line of the command prompt window will display the hostname of the machine without the domain.

What is the difference between hostname and IP address?

The main difference between IP address and hostname is that IP address is a numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication while hostname is a label assigned to a network that sends the user to a specific website or a webpage.

How to resolve host names with DNS server?

Resolving host names with a DNS server If you are using a name server or DNS server to resolve host names, the host name must be configured on the DNS server. The host name you configure on the DNS server must also match the host name configured in the operating system. To check the host name on the operating system, in a command prompt, type:

How can I resolve a hostname to an IP address in Linux?

All commands will resolve an IP address if host still exist. If host points to CNAME it will also get the IP in that case. The first command returns the resolved IPv4 address. The second command returns the resolved IPv6 address. The third command will return the owners preferred address what may IPv4 or IPv6 address.

Can a hostname resolve to more than one IP address?

Chris Down and Heinzi briefly discussed the case where the hostname resolves to more than one IP addresses. In this case (and others below), basic scripting under the assumption that a hostname directly resolves to a single IP address may break. Below, an example with a hostname resolving to more than a single IP address:

Why do I need to block some hostnames?

For my task, I need to block some hostnames, but since some websites may reply with different IP addresses to different DNS queries (for example, Google DNS and any other DNS server), I’d like to resolve same hostname using different DNS servers to get as many possible IP addresses as possible.