Every single device that is connected to the world wide web has a distinctive identifier named IP (Internet Protocol) address. This includes computers, web servers, smart phones, switches, and so on. The pool of addresses, that was introduced initially, is already distributed, hence the so-called IPv4 IP addresses are progressively being replaced with IPv6 addresses. Every domain which opens an internet site has an IP record, that 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 split up by a dot, while with the IPv6 system it's called AAAA and it consists of 8 groups 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 works with a considerably bigger number of IPs in comparison with the IPv4 format.