congstar.de

Readiness by lane

Green: congstar.de. Thin bar: Telecommunications & Internet peer median.

Priority fixes for congstar.de

Ordered by impact and by how common each practice is among peers.

1. Priority 1 · Accelerate

   HTTP/2 negotiated

   Observed: The TLS handshake selected HTTP/1.1 instead of HTTP/2.

   Why it matters: HTTP/2 sends many files over one connection, which speeds up pages with lots of images, styles and scripts.

   What to do: Enable HTTP/2 on your CDN or server. Most CDNs do this by default.

   72% of Telecommunications & Internet peers do this. Limit: Certificate and protocol were observed from one vantage point; CDNs can present different certificates by region.

   Guide: CDN Guide for Website Owners

2. Priority 2 · Harden

   HSTS kept for at least a year

   Observed: Strict-Transport-Security was sent with a max-age of 364 days, below the one-year benchmark.

   What to do: Send Strict-Transport-Security on HTTPS responses. Start with a short max-age (for example 300 seconds), confirm every subdomain works over HTTPS, then raise it in steps to 31536000. Add includeSubDomains only when all subdomains are HTTPS. HSTS preload is optional and hard to undo; hstspreload.org itself does not recommend it by default.

   54% of Telecommunications & Internet peers do this.

   Guide: HTTPS and TLS Guide for Website Owners

3. Priority 3 · Harden

   DMARC policy enforces quarantine or reject

   Observed: The DMARC policy for congstar.de was p=none, which asks receivers to take no action on failing mail.

   What to do: Publish DMARC with p=none and a reporting address first, fix any legitimate senders that fail SPF or DKIM alignment, then move to quarantine and finally reject.

   59% of Telecommunications & Internet peers do this.

   Guide: A Practical Website Health Check for Owners

4. Priority 4 · Accelerate

   No render-blocking scripts in <head>

   Observed: The homepage <head> loaded 5 external scripts without async or defer.

   What to do: Add defer to scripts that need the DOM, async to independent ones such as analytics, or move them to the end of the body.

   37% of Telecommunications & Internet peers do this.

   Guide: Control Third-Party Scripts Before They Control Your Page

What congstar.de already does well

Practices fewer than half of Telecommunications & Internet peers use.

• Nameservers spread across providersNameservers spread across more than one operator.16% of peers

What we saw

Homepage checked

https://www.congstar.de/

Homepage response

HTTP 200

TLS

TLSv1.3

Certificate

Deutsche Telekom Security GmbH, 197-day validity, expiring 2027-04-10

DNS operators

3 self-run or other nameserver domains

HSTS

max-age 364 days, includeSubDomains

DMARC policy

p=none

Homepage HTML

141 KB, gzip

Images on homepage

12 (webp 42, svg 5)

Limits: homepage only, one location, one moment. Header checks reflect the homepage response; other pages may differ.

All 31 checks

Select a gap for the method and fix. How each check works

Compare with other Telecommunications & Internet sites

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• movistar.com.mx61
• tracfone.com62
• u.com.my62
• videotron.com62

Telecommunications & Internet readiness benchmark