Every single device which is connected to the Internet has a specific identifier named IP (Internet Protocol) address. This includes PCs, web servers, smartphones, switches, etcetera. The pool of addresses, that was introduced at first, has already been distributed, so the so-called IPv4 IP addresses are slowly getting replaced with IPv6 addresses. Every domain name which opens a site comes with an IP record, that is the address of the server where it's hosted. When using the IPv4 system, the record is called A and it is made up of four sets of numbers from 1 to 255 divided with a dot, while in the IPv6 system it is called AAAA and it consists of eight sets of hexadecimal numbers i.e. this sort of records use numbers from 0 to 9 and letters from A to F. An example of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format supports a substantially bigger amount of IPs than the IPv4 format.