Every device that is connected to the Internet has a special identifier referred to as IP (Internet Protocol) address. This includes PCs, web servers, smart phones, switches, etc. The pool of addresses, which was introduced originally, has been distributed, therefore the so-called IPv4 IP addresses are gradually getting replaced with IPv6 addresses. Every domain which opens an internet 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 is made up of 4 groups of numbers from 1 to 255 split up using a dot, while within the IPv6 system it is called AAAA and it consists of 8 groups of hexadecimal numbers i.e. this type of records use digits 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 considerably greater amount of IPs compared with the IPv4 format.