Address Space IPv4 – 32 bit space – 2 32 -- 4 Billion+ IPv6 – 128 bit space – 2 128 – 340,282,366,920,938,463,463,374,607,431,768,211,456 – This is approximately 665,570,793,348,866,943,898,599 addresses per square meter of the surface of the planet Earth (assuming the earth surface is 511,263,971,197,990 square meters). – If addresses are assigned at the rate of one million address every microsecond, it would take over 20 years to assign all possible address. – Standard size of subnet – 2 64 (square of entire IPv4 network)
Addressing Eight groups of four hex digits 2001:0db8:85a3:0000:0000:8a2e:0370:7334 One or more leading zeros from any groups can be removed Consecutive sections of zeroes are replaced with a double colon (::)
Addressing (cont) Initial address: 2001:0db8:0000:0000:0000:ff00:0042:8329 After removing all leading zeroes: 2001:db8:0:0:0:ff00:42:8329 After omitting consecutive sections of zeroes: 2001:db8::ff00:42:8329
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