Every single device that is connected to the web has a distinctive identifier known as IP (Internet Protocol) address. This includes computer systems, web servers, smart phones, switches, and so on. The pool of addresses, which was introduced at first, has already been distributed, so the so-called IPv4 IP addresses are slowly getting replaced with IPv6 addresses. Every domain name that opens a website comes with an IP record, which is the address of the server where it's hosted. Using the IPv4 system, the record is called A and it comprises of 4 groups of numbers from 1 to 255 separated using a dot, while with the IPv6 system it's called AAAA and it is made up of 8 groups 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 is designed for a considerably greater number of IPs when compared with the IPv4 format.