Website Uptime Monitor

Monitor website availability and server information for any domain

arcusxray.org

Uptime & Server Information

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Current Status

Status
Active
Server Type
Apache
Page Title
Arcus X-ray Observatory
Meta Description
Arcus ('ARCUS') is a high resolution X-ray grating spectrometer mission that was proposed to NASA as a MIDEX in 2016 and selected by NASA for a Phase A concept study. This is the home page for the Arcus ('ARCUS') team and its main purpose is to disseminate information about the mission to the science community and the public at large. It is updated when newsworthy events happen, such as when the publication or poster list changes, or when new Arcus ('ARCUS') response files are available. Please note that the name of the mission refers to the goddess of rainbows, and is not an acronym. As such, 'Arcus' is the correct spelling, not 'ARCUS'.
Meta Keywords
Arcus, ARCUS, xray, x-ray, x-ray astronomy, high energy, telescope, spectrometer, spectroscopy, science
Last Checked
just now
Last Status Change
Came back up — 3 months ago (6/8/2026)
Last Downtime
First seen down 8 months ago (1/8/2026), back up 3 months ago

Observed Changes

DateStatusServer
6/8/2026, 1:17:53 PMActiveApache
1/29/2026, 7:51:06 AMInactiveUnknown
1/15/2026, 6:48:04 AMInactiveUnknown
1/12/2026, 10:28:34 PMInactiveUnknown
1/8/2026, 5:26:42 AMInactiveUnknown

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Uptime

We visit the site from multiple regions worldwide and email you within minutes if it goes down, with a per-region breakdown so a real outage stands out from a regional blip.

DNS changes

We watch NS, MX, CAA, DNSSEC, CNAME and A/AAAA records, and identify the host, network, and ASN behind them, so a real migration or hijack stands out from routine noise.

TLS certificate

We warn you 30, 14, 7, and 1 days before it expires, and flag it if the issuing authority changes or the certificate is unexpectedly replaced.

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About Website Uptime Monitoring

Use the Who.is uptime information to track the availability and server information of websites. This helps track:

  • Website availability and response status
  • Server software and configuration
  • Meta information including titles and descriptions
  • Historical uptime patterns

This information is valuable for website owners, system administrators, and anyone interested in monitoring website reliability and performance.

What this page reports

  • Last status change: When we last saw a site switch between reachable and unreachable
  • Last downtime: When a site was most recently seen down, and whether it has come back
  • Server and meta information: The server software, page title and meta tags we last observed

We check a domain at most once a day and record an observation only when something changes, so these are the times a change was seen rather than the exact moment it happened. For continuous, minute-by-minute checks with alerting, use website monitoring.

Disclaimer: Who.is is not affiliated with, endorsed by, or connected to any of the domains displayed on this page. We provide this information as a public service for informational purposes only.