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centron name servers reachable again after outage at the registry DENIC eG
On the evening of 5 May 2026 at around 9:40 pm, websites ending in “.de” were disrupted across Germany. The cause was a failure of the DENIC DNS service in connection with a DNSSEC fault.
As a result of the outage, centron name servers were also partly not reachable as usual. This led to temporary restrictions in the availability of websites and services. centron published information on the outage at 10:00 pm on its own status page for customers.
What caused the DENIC outage?
The outage on 5 May 2026 was due to a DNSSEC fault in the DNS service of DENIC, the central registry for “.de” domains. Name resolution was affected – not the servers or data of the connected providers. DENIC fixed the problems the same evening; DENIC has announced a final root cause analysis (RCA).
Sequence of events and cause
DENIC was able to fix the problems that evening. centron informed its customers at 00:46 am that NS resolution of its own systems was working again. According to DENIC, the cause was initially unknown but was being analysed in more detail. As soon as new findings are available, a root cause analysis (RCA) will be provided.
A word from the management
Dominik Seucan (CEO of centron GmbH) on the outage:
“This incident shows that central parts of our infrastructure still have considerable dependencies and risks. A disruption at a central registry such as DENIC with such far-reaching effects must not happen. Germany stands for digital sovereignty. Anyone who takes it seriously must also make the underlying infrastructure consistently resilient and fail-safe.”
Background: what does DENIC do?
The registry DENIC (Deutsches Network Information Center), based in Frankfurt, manages around 18 million domains with a “.de” address and also operates central DNS services for them. These are the address book of the web: they ensure that pages can be reached after a web address has been entered. DNSSEC protects the DNS data against manipulation and ensures that it is genuine and unchanged. Outages caused by problems with the DNS services of various providers have occurred time and again in the past.
How centron puts digital sovereignty and resilience into practice is explained on our page on data sovereignty.
Our team will be happy to answer any questions – by email to info@centron.de.
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