Every single device which is connected to the web has a distinctive identifier named IP (Internet Protocol) address. This includes computers, web servers, smart phones, switches, etc. The pool of addresses, that was introduced initially, is already distributed, so the so-called IPv4 IP addresses are progressively getting replaced with IPv6 addresses. Every domain which opens an internet site has an IP record, which is the address of the server where it is hosted. When using the IPv4 system, the record is called A and it is comprised of four groups of numbers from 1 to 255 split up by a dot, while within the IPv6 system it is called AAAA and it consists of eight groups of hexadecimal numbers i.e. this type of records use numbers from 0 to 9 and letters from A to F. An example of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format can handle a substantially bigger amount of IPs compared with the IPv4 format.