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- **Share your hacking tricks by submitting PRs to the [hacktricks repo](https://github.com/carlospolop/hacktricks) and [hacktricks-cloud repo](https://github.com/carlospolop/hacktricks-cloud)**.
In an IPv6 address, the **first 48 bits are the network prefix**. The **next 16 bits are the subnet ID** and are used for defining subnets. The last **64 bits are the interface identifier** (which is also known as the Interface ID or the Device ID, is for devices). If necessary, the bits that are normally reserved for the Device ID can be used for additional subnet masking.
There is not ARP in IPv6. Instead, there is **ICMPv6 NS (Neighbor Solicitation) and NA (Neighbor Advertisement)**. The **NS** is used to resolve and address, so it sends **multicast** packets. The **NA** is **unicast** as is used to answer the NS. A NA packet could also be sent without needing a NS packet.
**Link-local Addresses:** These are private address that is not meant to be routed on the internet. They can be used locally by private or temporary LANs for sharing and distribution of file among devices on the LAN. Other devices in your local LAN using this kind of addresses can be found sending a ping to the multicast address ff02::01\
If you **know the MAC address of a host in the same net** as you (you could just ping its ipv4 address and view the arp table to found its MAC address), you can calculate his Link-local address to communicate with him.\
**Unique local address:** This type of ipv6 address also not intended to be routed on the public internet. Unique local is a replacement of site-local address, that allows communication within a site while being routable to a multiple local networks.\
**Multicast Address:** This can also be refered to as One-to-Many. Packets addressed to multicast address are delivered to all interface identified by the multicast address. Multicast address types are easily notable because they normally begins with FF.\
**Anycast:** This form of ipv6 address is similar to the multicast address with a slight difference. Anycast address can also be refered to as One to Nearest. It can be used to address packets meant for multiple interfaces; but usually it sends packets to the first interface it finds as defined in the routing distance. This means it send packets to the closest interface as determined by routing protocols.\
The IPv6 of fe80::/10 are based on the MAC. If you have the IPv6 of a device inside a network and you want to guess the IPv6 of another device of the network, you can get its MAC address using a ping (inside the arp table).
- Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
- **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
- **Share your hacking tricks by submitting PRs to the [hacktricks repo](https://github.com/carlospolop/hacktricks) and [hacktricks-cloud repo](https://github.com/carlospolop/hacktricks-cloud)**.
