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Wait for the DNS changes to take effect
If you (or the website administrator) recently updated the DNS settings of the website or registered a new domain, please note that it can take up to 48 hours for these changes to take effect, so, the website may appear that it's down during this time.
Note: If 48 hours have passed and nothing changed (i.e. your website is still down), contact the hosting-server operators.
Maybe the website is down because of an ISP- or hosting-related issue. Try again in 10-30 minutes to check if it's back online. If it's still offline, report the issue to the hosting provider which will resolve it quickly.