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January 13, 2020 AFRINIC has no more than a final /11 of space left in the final /8. https://afrinic.net/20200113-afrinic-enters-ipv4-exhaustion-phase-2

November 25, 2019 RIPE exhausts its regional address pool. https://www.ripe.net/publications/news/about-ripe-ncc-and-ripe/the-ripe-ncc-has-run-out-of-ipv4-addresses

September 24, 2015 ARIN’s free pool IPv4 addresses reaches zero. https://www.arin.net/vault/announcements/2015/20150924.html

June 10, 2014 LACNIC enters the IPv4 exhaustion phase. https://www.lacnic.net/1532/2/lacnic/no-more-ipv4-addresses-in-latin-america-and-the-caribbean

April 26, 2011 A court authorizes the sale of Nortel IPv4 blocks to Microsoft, a deal facilitated by Addrex. http://www.circleid.com/posts/20110427_court_approves_nortels_sale_of_ipv4_addresses_to_microsoft/
https://www.networkworld.com/article/2228854/microsoft-pays-nortel–7-5-million-for-ipv4-addresses.html

April 2011 APNIC exhausts its regional address pool except for a final /8. https://www.apnic.net/community/ipv4-exhaustion/ipv4-exhaustion-details/

February 2011 The ICANN allocates the last 5 blocks of the Internet’s primary IP address pool to the RIRs.

April 2005 AFRINIC is formed as the RIR for Africa and joins the Number Resource Organization (NRO).

October 24, 2003 the four existing RIRs (APNIC, ARIN, LACNIC, and RIPE NCC) form the NRO.

October 2002 LACNIC is formally recognized by ICANN as the RIR for Latin America and the Caribbean region.

February 8, 2000 The United States Department of Commerce enters into an agreement with the Internet Corporation for Assigned Names and Numbers (ICANN) to perform the functions of IANA.

December 1998 The IETF publishes RFC 2460, specifying IPv6 (superseded in 2017 by RFC 8200).  https://tools.ietf.org/html/rfc2460

December 1998 The Internet Assigned Number Authority (IANA) becomes a part of the Internet Corporation for Assigned Names and Numbers (ICANN)

November 1998 Internet Corporation for Assigned Numbers and Names (ICANN) is incorporated as a non-profit to, in part, oversee domain name registration and the global registries.

December 1997 ARIN is formed as the RIR for Canada, the United States, and many Caribbean and North Atlantic islands.

May 1994 Network Address Translation (NAT) is specified in RFC 1631 in an attempt to prolong IPv4 address availability by translating private addresses in an internal network into public addresses. https://www.ietf.org/rfc/rfc1631.txt

September 1993 RFC 1519 is published to specify Classless Interdomain Routing Protocol (CIDR), replacing the original IP classful system, to help stem IPv4 address exhaustion. https://tools.ietf.org/html/rfc1519

January 13, 1993 APNIC is established as the RIR for the Asia-Pacific region.

April 1992 RIPE NCC is established as the RIR for Europe, West Asia, and the former USSR.

December 20, 1990 Berners-Lee publishes the first web site at info.cern.ch.

March 1989 Tim Berners-Lee writes a proposal that details the foundational concepts of the World Wide Web (WWW).

1985 Jon Postel formally establishes the IANA, which is responsible for assigning unique names and numbers on ARPANET.

October 1984 RFC 920 is published, defining several top-level domain names (e.g., .com).

November 1983 The Domain Name System (DNS), which translates human-friendly domain names into IP addresses, is created via RFC 880. https://tools.ietf.org/html/rfc882

September 1981 RFC 791 replaces RFC 760. https://tools.ietf.org/html/rfc791

January 1980 The formal (public) standard of Internet Protocol (IP) version 4 (IPv4) is introduced in Request for Proposal (RFC) 760.  https://tools.ietf.org/html/rfc760