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Did you take screenshots of it being down? Does the site have an errors log? Is there a site you checked those days to make sure it wasn't just you? (https://www.isitdownrightnow.com/ and https://d...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/43373 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Did you take screenshots of it being down? Does the site have an errors log? Is there a site you checked those days to make sure it wasn't just you? ([https://www.isitdownrightnow.com/](https://www.isitdownrightnow.com/) and [https://downforeveryoneorjustme.com/](https://downforeveryoneorjustme.com/) are a few). If the site is consistently archived on Archive.org's Wayback Machine, if you can show that on days surrounding it, there is an image of the site, but on the down-day, it shows just a (whatever) error, then that's another piece of evidence. Whatever you use, then just cite it like any other website. If you did screenshots as evidence, then I would include those as an appendix. (source - I used to teach Technical Writing at a local university)