Every device which is connected to the world wide web has a unique identifier named IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, etc. The pool of addresses, that was introduced at first, is already distributed, so the so-called IPv4 IP addresses are steadily being 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 consists of four groups of numbers from 1 to 255 split up with a dot, while with the IPv6 system it is called AAAA and it is comprised of 8 sets of hexadecimal numbers i.e. this type 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 supports a substantially greater number of IPs when compared with the IPv4 format.