What technology does t-online.de run?

Telecommunication DE Company

CipherCue observes t-online.de's public-facing infrastructure: its technology stack, hosting geography, DNS and email posture, certificates, and how these change over time.

10 categories of public infrastructure observed, from July 2026 to October 2026.

Observed technology stack

Frameworks

Next.js

CDN

CloudFront

Analytics

Google Analytics

A sample of what we observe. Sign up free to see the full stack with versions, DNS and email posture, certificates, and how it has changed over time.

AI crawlers blocked in robots.txt

t-online.de disallows 7 of 19 known AI crawlers in its robots.txt.

GPTBot · OpenAI ClaudeBot · Anthropic CCBot · Common Crawl PerplexityBot · Perplexity Bytespider · ByteDance Applebot-Extended · Apple Meta-ExternalAgent · Meta

Primary source: https://t-online.de/robots.txt (observed 12 October 2026).

Other Telecommunication organisations

Arsat Iliad Orange

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How this is observed: CipherCue continuously probes the public-facing infrastructure of tracked organisations. All observations are produced from publicly accessible sources only: no authenticated access, no intrusive probing, no third-party data feeds. See the observation methodology for full detail.