Each device that is connected to the Internet has a distinctive identifier known as IP (Internet Protocol) address. This includes computers, web servers, smart phones, switches, etcetera. The pool of IPs, that was introduced initially, has been distributed, so the so-called IPv4 IP addresses are gradually being 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's hosted. When using the IPv4 system, the record is called A and it consists of four sets of numbers from 1 to 255 split up using a dot, while within the IPv6 system it's called AAAA and it is comprised 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 is designed for a considerably larger number of IPs when compared with the IPv4 format.