Each device which is connected to the world wide web has a special identifier known as IP (Internet Protocol) address. This includes personal computers, web servers, smartphones, switches, and so on. The pool of IPs, which was introduced initially, has been distributed, hence the so-called IPv4 IP addresses are progressively getting replaced with IPv6 addresses. Every domain name that opens an internet site has an IP record, which is the address of the server where it is hosted. Using the IPv4 system, the record is called A and it comprises of four sets of numbers from 1 to 255 split up by a dot, while within the IPv6 system it's called AAAA and it is made up of eight groups of hexadecimal numbers i.e. this kind of records use digits 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 number of IPs in comparison with the IPv4 format.