Each device that is connected to the world wide web has a distinctive identifier named IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, etc. The pool of IPs, that was introduced at first, is already distributed, hence the so-called IPv4 IP addresses are gradually being replaced with IPv6 addresses. Every domain name which opens an internet site comes with an IP record, that is the address of the server where it's hosted. Using the IPv4 system, the record is called A and it comprises of four sets of numbers from 1 to 255 split up with a dot, while within the IPv6 system it's called AAAA and it is made up of eight groups of hexadecimal numbers i.e. this type 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 supports a considerably larger amount of IPs when compared with the IPv4 format.