Website readiness profile · Snapshot 23 October 2026
immowelt.de
immowelt.de's public homepage, certificate and DNS checked against 31 practices and compared with 254 Real Estate & Property Listings sites.
- Readiness index
- 79/100
- Ahead of
- 83%
- Practices observed
- 22/31
- Popularity band
- Top 5K
Real Estate & Property Listings median 66
of measured Real Estate & Property Listings sites
0 of 31 could not be measured
Chrome UX Report top-sites list
Readiness by lane
Green: immowelt.de. Thin bar: Real Estate & Property Listings peer median.
Enable
95/100
Peers 82
Harden
66/100
Peers 58
Accelerate
90/100
Peers 65
Recover
0/100
Peers 7
Priority fixes for immowelt.de
Ordered by impact and by how common each practice is among peers.
Priority 1 · Harden
DMARC policy enforces quarantine or reject
Observed: The DMARC policy for immowelt.de was p=none, which asks receivers to take no action on failing mail.
Why it matters: An enforcing DMARC policy helps receiving mail systems reject email that falsely claims to come from your domain, a common route for phishing your customers.
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.
51% of Real Estate & Property Listings peers do this. Limit: Read from public DNS at the time of the check; records may have changed since.
Priority 2 · Harden
Content Security Policy present
Observed: The homepage response did not include a Content-Security-Policy header.
What to do: Start with Content-Security-Policy-Report-Only to see what would break, tighten the policy over a few weeks, then enforce it.
30% of Real Estate & Property Listings peers do this.
Guide: Payment Security and PCI DSS: What Website Owners Need to Know
Priority 3 · Accelerate
HTTP/3 advertised
Observed: The homepage did not advertise HTTP/3 through an Alt-Svc header.
What to do: Turn on HTTP/3 at your CDN. Browsers fall back to HTTP/2 automatically, so the risk is low.
On Amazon CloudFront: Select HTTP/3 in the distribution's supported HTTP versions.
27% of Real Estate & Property Listings peers do this.
Priority 4 · Harden
Certificate lifetime of 100 days or less
Observed: The certificate from Amazon had a 197-day validity period, longer than the 100-day maximum that applies from March 2027.
What to do: Move to automated issuance and renewal now, while you still have time to test it.
52% of Real Estate & Property Listings peers do this.
What immowelt.de already does well
Practices fewer than half of Real Estate & Property Listings peers use.
- security.txt publishedsecurity.txt with a contact found.8% of peers
- HSTS kept for at least a yearHSTS with a 365-day max-age.43% of peers
- X-Content-Type-Options: nosniffnosniff header present.45% of peers
What we saw
- Homepage checked
- https://www.immowelt.de/
- Homepage response
- HTTP 200
- TLS
- TLSv1.3, HTTP/2
- Certificate
- Amazon, 197-day validity, expiring 2027-03-15
- CDN or edge
- Amazon CloudFront
- DNS operators
- Amazon Route 53
- HSTS
- max-age 365 days
- DMARC policy
- p=none
- Homepage HTML
- 1,014 KB, br
- Images on homepage
- 11 (webp 13)
Limits: homepage only, one location, one moment. Header checks reflect the homepage response; other pages may differ.
Stack and providers
Seen in the homepage response, certificate and DNS. Provider pages compare how their customers configure the same checks.
All 31 checks
Select a gap for the method and fix. How each check works
Not observed 9
Observed 22
- HTTP requests move to HTTPS
- HSTS kept for at least a year
- TLS 1.3 negotiated
- Certificate has more than 14 days left
- security.txt published
- X-Content-Type-Options: nosniff
- Framing restricted
- HTTP/2 negotiated
- HTML compressed
- Static files cached for 30 days or more
- Modern image formats in use
- Offscreen images lazy-loaded
- No render-blocking scripts in <head>
- robots.txt published
- XML sitemap discoverable
- Canonical URL declared
- Meta description written
- Mobile viewport configured
- Structured data present
- Social preview image set
- Page language declared
- At most one redirect to the homepage
Own immowelt.de?
Re-run the checks after a change, or verify the site in a free workspace to save reports with history, compare against similar sites and competitors, and track a private action plan. What owners get.
Live status for this site: Status Is Down: immowelt.de. This profile covers configuration only.