An IP address is an identifier for a computer or device on a TCP/IP network and its unique for each device and no two devices can have same IP address. Networks route messages based on the IP address of the destination. The format of an IP address is four numbers separated by periods and each number can be between 0 to 255. For example, 192.168.10.230 is an IP address.
A domain name is a name that identifies an IP addresses. A domain name can identify one or more IP addresses. Also more than one domain names can point to a single IP address. A domain names is used to identify a website over the internet. For example, consoleindiainc.com is the domain name for our website.
How is this important to users of internet?
There are several situations where server identification information is needed such as:
- IP addresses change easily. For example, an administrator may need to bring up a standby server to replace a malfunctioning server. That new server will have its own unique identifier, may be either an IP address or a domain name.
- An IP address range may change due to data center or ISP change requirements.
- A domain name allows the server to use an SSL certificate, which is responsible for the encryption of data-in-motion between server and device. In this case a dedicated IP address is usually assigned to the domain name for the use of SSL certificate.