Migrating to IPv6 on the Solaris OS
Source: Sun Microsystems
The biggest difference between IPv4 and IPv6 is addressing, because IPv6 uses 128 bits for addressing compared to IPv4, which uses 32 bits. IPv6 can be used to specify 2 128 (about 3.4 x 10 38) addresses or about 5 x 10 28 unique addresses for each of the 6.5 billion people alive on planet Earth today. IPv4, with 32 bits of addressing, can be used to specify 2 32 (about 4.3 x 10 9) addresses. IPv4 was to have run out of addresses by 2008, but with Network Address Translation (NAT) and Classless Internet Domain Routing (CIDR) it seems to have gotten an extension.