Every device that's connected to the world wide web has a specific identifier named IP (Internet Protocol) address. This includes PCs, web servers, smart phones, switches, and so on. The pool of addresses, which was introduced initially, has been distributed, so the so-called IPv4 IP addresses are steadily getting replaced with IPv6 addresses. Every domain that opens an internet site has 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 is made up of 4 groups of numbers from 1 to 255 split up with a dot, while with the IPv6 system it's called AAAA and it comprises of 8 sets of hexadecimal numbers i.e. this kind 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 substantially larger number of IPs compared with the IPv4 format.