Editing DECnet (section)

==Notable installations==

===DEC Easynet===
{{Distinguish|text = [[Easynet]], an [[ISP]]}}
DEC's internal corporate network was a DECnet network called Easynet, which had evolved from DEC's Engineering Net (E-NET). It included over 2,000 nodes as of 1984,<ref name=Fair1984>Erik E. Fair (January 5, 1984). [https://www.cs.rutgers.edu/~cwm/NetStuff/Human-Nets/Volume7.html Re: The Plethora of Networks]. ''Usenet fa.human-nets''. Retrieved August 19, 2018. {{Webarchive|url=https://web.archive.org/web/20160314181049/http://www.cs.rutgers.edu/~cwm/NetStuff/Human-Nets/Volume7.html |date=March 14, 2016 }}</ref> 15,000 nodes (in 39 countries) as of 1987,<ref name=NW1987>Network World (September 7, 1987), p.4. [https://books.google.com/books?id=ix0EAAAAMBAJ&pg=PA4&dq=easynet DECworld network links hotels, ocean liners]. Retrieved August 19, 2018.</ref> and 54,000 nodes as of 1990.<ref name=NW1990>Network World (August 6, 1990), p.1. [https://books.google.com/books?id=Tx0EAAAAMBAJ&pg=PA1 DEC shares early lessons on DECnet V]. Retrieved August 19, 2018.</ref>

===The DECnet Internet===
DECnet was used at various scientific research centers which linked their networks to form an international network called the DECnet Internet.  This included the [[U.S. Space Physics Analysis Network]] (US-SPAN), the [[European Space Physics Analysis Network]] (E-SPAN), [[Energy Sciences Network]], and other research and education networks.<ref name=Vance1990-Book>L. Stuart Vance (1990). [https://books.google.com/books?id=ecvNBQAAQBAJ&pg=PA150 The User's Directory of Computer Networks, The DECnet Internet]. Retrieved August 19, 2018.</ref><ref name=Vance1990-Summary>L. Stuart Vance (1990). [https://www.sciencedirect.com/science/article/pii/B9781555580476500126 The User's Directory of Computer Networks, The DECnet Internet (Publisher Summary)]. Retrieved August 19, 2018.</ref> The network consisted of over 17,000 nodes as of 1989.<ref name=NASA1989>NASA Technical Reports Server (August 1, 1989). [https://ntrs.nasa.gov/search.jsp?R=19910021669 Space physics analysis network node directory (The Yellow Pages): Fourth edition]. Retrieved August 19, 2018. {{Webarchive|url=https://web.archive.org/web/20210308195901/https://ntrs.nasa.gov/search.jsp?R=19910021669 |date=March 8, 2021 }}</ref> Routing between networks with different address spaces involved the use of either "poor man's routing" (PMR) or address translation gateways.<ref name=Vance1990-Book/> In December 1988, VAX/VMS hosts on the DECnet Internet were attacked by the [[Father Christmas (computer worm)|Father Christmas worm]].

===CCNET===
CCNET (Computer Center Network) was a DECnet network that connected the campuses of various universities in the eastern regions of the United States during the 1980s. A key benefit was the sharing of systems software developed by the operations staff at the various sites, all of which were using a variety of DEC computers.<ref name=CU-DEC20>{{cite web |archive-url=https://web.archive.org/web/20220707101822/https://www.columbia.edu/cu/computinghistory/dec20.html#networks |title=The DECSYSTEM-20 at Columbia University 1977-1988 |url=http://www.columbia.edu/cu/computinghistory/dec20.html#networks |archive-date=July 7, 2022 |access-date=July 1, 2024 |url-status=live}}</ref>  As of March 1983, it included [[Columbia University]], [[Carnegie Mellon University]], and [[Case Western Reserve University]].  By May 1986, [[New York University]], [[Stevens Institute of Technology]], [[Vassar College]] and [[Oberlin College]] had been added. Several other universities joined later.<ref name=CU-History>{{cite web |archive-url=https://web.archive.org/web/20220706001116/https://www.columbia.edu/cu/computinghistory/ |title=Computing at Columbia Timeline |url=http://www.columbia.edu/cu/computinghistory/ |archive-date=July 6, 2022 |access-date=July 1, 2024 |url-status=live}}</ref>

===Hobbyist DECnet networks===
Hobbyist DECnet networks have been in use during the 21st century.  These include:
* HECnet<ref>[http://mim.stupi.net/hecnet.htm HECnet - The hobbyist DECnet]. Retrieved January 24, 2022.</ref>
* Italian Retro DECnet<ref>[http://decnet.ipv7.net Retro DECnet]. Retrieved August 19, 2018.</ref>