A bit on computer addressing. We ran out of the prior one.

IPv6

• Welp, ipv4 got over. So we needed more addresses.
• 128 bits. Much larger than 32 bits of ipv4.

Multicasting

• Unlike ipv4, this doesn't have a generic broadcast address for a subnet.
• Just as IPv4 has 255.255.255.255 as the global subnet broadcast address, here the equivalent is ff02::1.
• It is also possible to have a global multicast.
• The first 64 bits are global address space (smallest subnet size).