Every single device that's connected to the Internet has a special identifier named IP (Internet Protocol) address. This includes PCs, web servers, smartphones, switches, etc. The pool of IPs, that was introduced initially, is already distributed, therefore the so-called IPv4 IP addresses are steadily getting replaced with IPv6 addresses. Every domain which opens a website 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 is made up of 4 groups of numbers from 1 to 255 separated by a dot, while within the IPv6 system it's called AAAA and it comprises of eight sets of hexadecimal numbers i.e. this kind of records use numbers from 0 to 9 and letters from A to F. An illustration of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format can handle a considerably larger number of IPs when compared with the IPv4 format.