Each device which is connected to the world wide web has a special identifier named IP (Internet Protocol) address. This includes personal computers, web servers, smartphones, switches, etc. The pool of IP addresses, which was introduced originally, is already distributed, hence the so-called IPv4 IP addresses are slowly getting replaced with IPv6 addresses. Every domain that opens a website has an IP record, that is the address of the server where it is hosted. When using the IPv4 system, the record is called A and it is comprised of four sets of numbers from 1 to 255 separated using a dot, while in the IPv6 system it's called AAAA and it consists of 8 sets of hexadecimal numbers i.e. this sort 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 significantly greater amount of IPs when compared with the IPv4 format.