How many devices can ipv6 support

IPv6 uses 128-bit addresses as opposed to the 32-bit addresses used by IPv4, allowing for a substantially larger number of possible addresses. With each bit corresponding to a '0' or '1', this theoretically allows 2^128 combinations or 340 trillion, trillion, trillion addresses.

1. Can multiple devices have the same IPv6 address?
2. How many IPv6 addresses should I have?
3. Does every device support IPv6?

Can multiple devices have the same IPv6 address?

Yes. They don't share the whole address, but they do usually share the subnet prefix.

How many IPv6 addresses should I have?

With IPv6 it is completely normal for a device to have lots of addresses. At least one global IPv6 address per interface. Usually between three and five privacy global IPv6 addresses per interface (one active, one being probed for duplicates, and several deprecated but possibly still in use).

Does every device support IPv6?

All modern computers and mobile phones support both IPv4 and IPv6, and if you look at your device IP addresses you will probably see both.