What is updown?

updown is an online service that checks your website's status by periodically sending an HTTP request to the URL of your choice. It then notifies you by email or sms when your website is not responding correctly.

Read the updown.io story on indiehackers.
Who is behind updown.io?

Another monitoring website?

Yes, there are a few existing alternatives but I was looking for a service really simple, cheap and nice looking. I couldn't find any, that's why I decided to build one the way I want. If you think something's missing, don't hesitate to leave your idea with the "feedback" button at the bottom.

Where are updown servers? What are their IPs?

There are currently 9 monitoring nodes, monitoring requests to your servers will come from these IPs. You can get the list of nodes or IPs from the API to automate this part, check out the /nodes endpoints.

Some web requests and webhooks may also be emitted from our main web server in some cases (IPs in updown.io). So if you want to IP filter updown webhooks reception on your end, make sure to allow this IP too (in addition to the monitoring nodes). This one is not listed explicitly because it's more likely to change without notice, better not hardcode it. Instead:

👨‍💻 You can use the ips.updown.io DNS entry which contains as A and AAAA records the IPs from all our monitoring nodes and web servers.

If you need to whitelist our servers we recommend to do it based on User-Agent, using the "updown.io" match string (contained in all our requests). Otherwise prefer the ips.updown.io hostname and if you don't have any other choice than entering IPs manually, don't forget to enable the "IP whitelisting" option in your settings in order to be notified of IP changes and excluded from new locations by default. Otherwise you may get false positive results.
Los Angeles, US
Miami, US
Montreal, Canada
Roubaix, France
Frankfurt, Germany
Helsinki, Finland
Singapore, Singapore
Tokyo, Japan
Sydney, Australia