History of IP

From ARPANET to IPv4 exhaustion, the role of IANA/RIRs

• The History of IP and IPv4 Exhaustion From ARPANET to today — the origins of IP, the role of IANA and the RIRs, how IPv4 addresses ran out, and what is being done about it.
• IANA and the RIRs: Who Hands Out IP Addresses How IP addresses are governed — IANA at the top, the five Regional Internet Registries (ARIN, RIPE NCC, APNIC, LACNIC, AFRINIC), and how allocation flows down to ISPs.