[House Atreides]

Here’s a site you can check.

https://www.isitdownrightnow.com/

[dayglored]

Yes, https://www.isitdownrightnow.com/ is a good one for individual site checking.

Also look at https://downdetector.com for major services (like Facebook, Office365, Twitter, etc.)

[albie]

Very interesting web site at www.isitdown…! Thanks very much

[V K Lee]

Another should the first not work:
https://downforeveryoneorjustme.com/