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Line 16: By the early 2010s millions of connections on a single commodity 1U rackmount server became possible: over 2 million connections ([[WhatsApp]], 24 cores, using [[Erlang (programming language)\|Erlang]] on [[FreeBSD]]),<ref name = "WhatsApp blog, 2012" > {{ Cite web \| url = https://blog.whatsapp.com/196/1-million-is-so-2011 \| title = 1 million is so 2011 \| access-date = 25 July 2019 \| date = 6 January 2012 \| website = [[WhatsApp]] blog \| quote = This time we also wanted to share some more technical details with you about hardware, OS and software: hw.machine: amd64 hw.model: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz hw.ncpu: 24 hw.physmem: 103062118400 hw.usermem: 100556451840 \| archive-url = https://web.archive.org/web/20140501234954/https://blog.whatsapp.com/196/1-million-is-so-2011 \| archive-date = 1 May 2014 \| df = dmy-all }} </ref><ref name = "Reed, Erlang Factory, 2012" > {{ Cite web \| url = http://www.erlang-factory.com/upload/presentations/558/efsf2012-whatsapp-scaling.pdf \| title = Scaling to Millions of Simultaneous Connections \| access-date = 25 July 2019 \| first = Rick \| last = Reed \| date = 30 March 2012 \| website = Erlang Factory \| format = pdf \| page = 7 \| archive-url = https://web.archive.org/web/20120709235656/http://www.erlang-factory.com/upload/presentations/558/efsf2012-whatsapp-scaling.pdf \| archive-date = 9 July 2012 \| df = dmy-all }} </ref> 10–12 million connections (MigratoryData, 12 cores, using [[Java (Programming language)\|Java]] on [[Linux]]).<ref name="C10M" /> <ref name="C10M-howto" /> Common applications of very high number of connections include general public servers (or even private servers of very big companies whose sparse offices are connected to those servers via their [[Virtual private network\|VPNs]]) such as [[Database server\|database servers]], [[File server\|file servers]], [[Ftp server\|ftp servers]], [[Proxy server\|proxy servers]], web servers, [[Internet Relay Chat\|chat servers]], [[Load balancing (computing)\|load balancers]], etc~~.; in some rare cases, even custom software aimed to specific purposes (i.e. [[Data collection system\|data collection systems]], etc.) may require a very high number of connections~~. <ref name="conn-very-high-DB">{{Cite book\|url=https://books.google.it/books?id=W3hkvBKjcZEC&pg=PA281&lpg=PA281&dq=file+OR+server+%22very+high+number+of+connections%22&source=bl&ots=10_PjNmDNp&sig=ACfU3U3eRd_cZl1H80q3u65UUoaZ6xLmaw&hl=it&sa=X&ved=2ahUKEwim6PfjrszzAhXPRPEDHZr8AusQ6AF6BAgSEAM#v=onepage&q=file%20OR%20server%20%22very%20high%20number%20of%20connections%22&f=false \|title=Beginning MySQL Database Design and Optimization: From Novice to Professional\|language=en\|year=2004\|access-date=2021-10-15\|author1=Jon Stephens\|author2=Chad Russel\|isbn=978-1-59059-332-5}}</ref>

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