Every single device which is connected to the world wide web has a special identifier referred to as IP (Internet Protocol) address. This includes computers, web servers, smart phones, switches, etcetera. The pool of IP addresses, which was introduced initially, has already been distributed, therefore the so-called IPv4 IP addresses are gradually being replaced with IPv6 addresses. Every domain which opens a site has an IP record, that is the address of the server where it's hosted. With the IPv4 system, the record is called A and it comprises of four groups of numbers from 1 to 255 separated using a dot, while within the IPv6 system it's called AAAA and it comprises of 8 sets of hexadecimal numbers i.e. this kind of records use numbers from 0 to 9 and letters from A to F. A good example of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format can handle a substantially larger number of IPs when compared with the IPv4 format.