Each device which is connected to the world wide web has a special identifier referred to as IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, and so on. The pool of addresses, that was introduced at first, has already been distributed, therefore the so-called IPv4 IP addresses are steadily getting replaced with IPv6 addresses. Every domain name which opens an internet site has 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 is comprised of 4 sets of numbers from 1 to 255 split up with a dot, while within 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 considerably larger number of IPs compared with the IPv4 format.