Every device which is connected to the web has a special identifier known as IP (Internet Protocol) address. This includes computer systems, web servers, smart phones, switches, and so on. The pool of IPs, which was introduced at first, has been distributed, therefore the so-called IPv4 IP addresses are slowly being replaced with IPv6 addresses. Every domain name that opens an internet site comes with an IP record, which is the address of the server where it's hosted. When using the IPv4 system, the record is called A and it comprises of 4 groups of numbers from 1 to 255 separated using a dot, while within the IPv6 system it's called AAAA and it consists of eight sets of hexadecimal numbers i.e. this sort 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 works with a significantly bigger number of IPs than the IPv4 format.