Y Combinator · Winter 2013, Summer 2013 · 1 November 2026

What domains do YC’s 2013 startups use?

Of the 80 startups in Y Combinator’s 2013 batches that have a website, 94% use a .com and 4% a .io.

94%
on .com, 2012: 91%
4%
on .io, 2012: 3%
0%
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Which extensions the 2013 startups use

Batch by batch

Winter 201338.com92%.io5%
Summer 201342.com95%.io2%

Is the .com of a 2013 YC startup’s name for sale?

5 of the 2013 startups are not on a .com. For 0 of them, the .com of their name is for sale. 5 are registered with no sale listing; some are the startup’s own redirect.

  1. Registered, no sale listing100%

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