Stats
Y Combinator directory · 6,358 startups · 1 November 2026

What domain do YC startups use?

Of the 813 YC startups in the 2026 batches that have a website, 48% use a .com and 26% a .ai.

92% → 48%
on .com, 2008 to 2026
0% → 26%
on .ai
1 in 5
of the 2026 startups off .com find the .com of their name for sale

See what the .com of your name is worth before you pick .ai or .io →

Since 2008 the .com’s share has halved, most of it to .ai

.ai went from none to 33% in 2025, then 26% in 2026.

.com: 2008 92%, 2009 100%, 2010 96%, 2011 94%, 2012 91%, 2013 94%, 2014 83%, 2015 87%, 2016 80%, 2017 74%, 2018 69%, 2019 68%, 2020 59%, 2021 60%, 2022 53%, 2023 50%, 2024 51%, 2025 45%, 2026 48%; .ai: 2008 0%, 2009 0%, 2010 0%, 2011 0%, 2012 0%, 2013 0%, 2014 2%, 2015 2%, 2016 3%, 2017 5%, 2018 5%, 2019 7%, 2020 9%, 2021 8%, 2022 13%, 2023 23%, 2024 25%, 2025 33%, 2026 26%; .io: 2008 3%, 2009 0%, 2010 0%, 2011 1%, 2012 3%, 2013 4%, 2014 3%, 2015 3%, 2016 6%, 2017 7%, 2018 7%, 2019 7%, 2020 9%, 2021 7%, 2022 8%, 2023 7%, 2024 3%, 2025 4%, 2026 4%0%20%40%60%80%100%.com 48%.ai 26%.io 4%2008201120142017202020232026
Share of each year’s YC startups on .com, .ai and .io, 2008 to 2026.

Is the .com of a YC startup’s name for sale?

2,413 YC startups are not on a .com. For 396 of them (1 in 6), the .com of their name is for sale, and 34 more are parked. 1,968 are registered with no sale listing; some are the startup’s own redirect. 15 are unregistered.

  1. For sale16%
  2. Parked1%
  3. Registered, no sale listing82%
  4. Unregisteredunder 1%

Own the .com of a startup’s name? See what it’s worth →

Which extensions YC’s 2026 startups use

2026
  1. .com48%
  2. .ai26%
  3. .io4%
  4. .dev3%
  5. .co3%
  6. .sh1%
  7. 60 more extensions15%

Every batch year

20262026813.com48%.ai26%20252025620.com45%.ai33%20242024584.com51%.ai25%20232023482.com50%.ai23%20222022611.com53%.ai13%20212021707.com60%.ai8%20202020417.com59%.ai9%20192019334.com68%.ai7%20182018259.com69%.ai5%20172017220.com74%.ai5%20162016207.com80%.ai3%20152015195.com87%.ai2%20142014134.com83%.ai2%2013201380.com94%.ai0%20122012132.com91%.ai0%2011201196.com94%.ai0%2010201047.com96%.ai0%2009200936.com100%.ai0%2008200837.com92%.ai0%

2005 to 2007 and 2027 are too small for a page: 59 startups with a website between them, 52 on a .com.

Source: Y Combinator’s company directory and the .com zone file, 1 November 2026.