Every single device that is connected to the world wide web has a distinctive identifier named IP (Internet Protocol) address. This includes PCs, web servers, smartphones, switches, and so on. The pool of IPs, which was introduced at first, has already been distributed, therefore the so-called IPv4 IP addresses are progressively being replaced with IPv6 addresses. Every domain which opens an internet site comes with an IP record, that is the address of the server where it's hosted. When using the IPv4 system, the record is called A and it is made up of four sets of numbers from 1 to 255 divided using a dot, while with the IPv6 system it's called AAAA and it comprises of 8 sets of hexadecimal numbers i.e. this type 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 works with a considerably bigger amount of IPs when compared with the IPv4 format.