The problem - IPv4

• 32 bit address

• 4,294,967,296 - Addresses
• Except we loose:
• Multicast etc. ~ 537 million
• Localhost ~ 16 million
• RFC 1918/zeroconf ~ 17 million

• Rate of allocation

• IANA ran out 03 Feb 2011
• RIRs – Q3 2011 – Q1 2012