In this section, we will discuss the different categories and types of addresses that exist in IPv6. The types of IPv6 addresses can be identified taking the ranges defined by the first bits of each address. Among the main types of IPv6 addresses, we can highlight the following:

• Unicast: These addresses uniquely identify an interface.
• Multicast: These are addresses that identify a set of interfaces. A packet that is sent to a multicast address is forwarded to all interfaces identified by this address.
• Anycast: These types of addresses identify a set of interfaces. A packet that is sent to an anycast address is forwarded to one of the interfaces identified by this address, being the closest one according to the routing protocol used.
• Link-local: These types of addresses are created automatically and exclusively used in local subnets, therefore they are not routable. This type of address starts with the fe80 :: / 64 prefix. The link-local IP address is created automatically by adding the Mac address of the interface in IPv6 format to the previous prefix. In this way, a Mac of the AE: 3E: 7B: 33: 5F: B0 type will have an IPv6 address of the fe80 :: ac3e: 7bff: fe33: 5fb0 link-local type.
• Unique Local Addresses (ULA) (RFC 4193): These types of addresses are the equivalent of private networks in IPv4. They are non-routable addresses in IPv6 to the internet. The routers with IPv6 support are responsible for discarding the packets coming from these addresses. This type of address has an address space of the fc00 :: / 7 type, which in turn is divided into two networks with an 8-bit mask – fc00 ::: / 8 (pending definition, and reserved) and fd00 :: / 8, which is what can be used to create the network.
• Global: An address with an unlimited scope.