Every single device which is connected to the web has a specific identifier called IP (Internet Protocol) address. This includes computer systems, web servers, smartphones, switches, etcetera. The pool of IPs, which was introduced originally, has been distributed, therefore the so-called IPv4 IP addresses are progressively getting replaced with IPv6 addresses. Every domain name which opens a site has an IP record, which is the address of the server where it is 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 using a dot, while within the IPv6 system it's called AAAA and it is comprised of 8 groups of hexadecimal numbers i.e. this kind of records use numbers from 0 to 9 and letters from A to F. An illustration of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format is designed for a significantly bigger amount of IPs when compared with the IPv4 format.