Every single device which is connected to the world wide web has a special identifier known as IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, etcetera. The pool of IP addresses, which was introduced originally, has already been distributed, therefore the so-called IPv4 IP addresses are gradually being replaced with IPv6 addresses. Every domain that opens a site has an IP record, which is the address of the server where it is hosted. Using the IPv4 system, the record is called A and it consists of 4 groups of numbers from 1 to 255 separated by a dot, while with the IPv6 system it is called AAAA and it is made up of eight sets of hexadecimal numbers i.e. this kind of records use digits 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 can handle a considerably bigger number of IPs when compared with the IPv4 format.