Each device that's connected to the web has a distinctive identifier named IP (Internet Protocol) address. This includes computer systems, web servers, smart phones, switches, etcetera. The pool of IPs, that was introduced at first, has already been distributed, therefore the so-called IPv4 IP addresses are progressively getting replaced with IPv6 addresses. Every domain name that opens a site comes with an IP record, that is the address of the server where it is hosted. Using the IPv4 system, the record is called A and it is made up of 4 groups of numbers from 1 to 255 split up using a dot, while within the IPv6 system it's called AAAA and it consists of eight sets of hexadecimal numbers i.e. this sort 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 works with a substantially larger number of IPs compared with the IPv4 format.