About these checks

Why we are requesting your site

You have probably arrived here from a line in an access log. This is Vallic cloud's uptime monitoring, and it is requesting your site because Vallic cloud hosts it — we measure availability from outside our own network so that the figure means something.

Requests come from a client identifying itself as:

vallic-uptime/1.0 (+https://status.vallic.net/about)

What it does

One request at a time, to a small fixed set of URLs. It does not crawl, follow links or enumerate anything.
GET or HEAD only. It never posts, never submits a form and never signs in.
No cookies, no session, no JavaScript. Each request stands alone.
It asks for the first two kilobytes with a Range header when it only needs to confirm a marker is present, rather than pulling the whole page.
It respects your certificate. A failed verification is recorded as a failure rather than ignored — that is most of the point.

How often

Once a minute for the checks that answer “is the site up”, and once every five minutes for DNS. Each check is offset by a stable amount so the regions do not all arrive at the same instant.

From where

Checks arrive from these addresses. They are recorded automatically as each prober reports in, so this list is current rather than something somebody remembered to update:

Region	Source address	Last reported
Paris	51.159.117.46	4d ago
Milan	172.232.214.147	17s ago
New York	167.99.236.27	16s ago
Singapore	13.212.234.204	15s ago

If you run a firewall or a WAF, allowing these addresses stops the checks being challenged or rate-limited. A blocked check reads as your site being down — to us, and on this status page.

What we keep

The status code, how long each stage of the request took, and whether a marker we were told to look for was present. We do not store the content of your pages, and nothing here is used for anything but availability.

Raw results are kept for fourteen days. What survives is the record of when a site was unreachable and for how long, because that is what an availability figure is computed from and what a credit is argued from.

Making it stop

Do not block it silently — a blocked check is indistinguishable from an outage, and it will be reported as one on this page and to whoever asked us to watch the site.

Write to https://status.vallic.net/about and we will stop checking, or change what we check, the same day.