Every single device which is connected to the world wide web has a special identifier named IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, etcetera. The pool of addresses, which was introduced originally, has already been distributed, so the so-called IPv4 IP addresses are progressively getting replaced with IPv6 addresses. Every domain which 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 is made up of four 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 groups of hexadecimal numbers i.e. this type of records use digits 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 supports a substantially greater amount of IPs compared with the IPv4 format.