221616.com

Readiness by lane

Green: 221616.com. Thin bar: Cars & Automotive peer median.

Priority fixes for 221616.com

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

1. Priority 1 · Enable

   Mobile viewport configured

   Observed: The homepage had no viewport meta tag, so phones may render it zoomed out.

   Why it matters: Without it, phones render the page at desktop width and shrink it, which makes text tiny and hard to use.

   What to do: Add <meta name="viewport" content="width=device-width, initial-scale=1"> and check the layout on small screens.

   97% of Cars & Automotive peers do this. Limit: Based on the homepage HTML delivered to an automated client; scripts that run later were not executed.

   Guide: Responsive Web Design Checklist for Real Devices

2. Priority 2 · Accelerate

   HTTP/2 negotiated

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

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

   90% of Cars & Automotive peers do this.

   Guide: CDN Guide for Website Owners

3. Priority 3 · Enable

   XML sitemap discoverable

   Observed: No sitemap was listed in robots.txt or found at /sitemap.xml.

   What to do: Generate an XML sitemap of canonical URLs, reference it in robots.txt and submit it in Google Search Console.

   83% of Cars & Automotive peers do this.

   Guide: XML Sitemap Guide: Include Only URLs You Stand Behind

4. Priority 4 · Harden

   HSTS kept for at least a year

   Observed: The homepage response did not include a Strict-Transport-Security header.

   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.

   On Cloudflare: Enable HSTS under SSL/TLS > Edge Certificates > HTTP Strict Transport Security and raise max-age gradually.

   41% of Cars & Automotive peers do this.

   Guide: HTTPS and TLS Guide for Website Owners

What 221616.com already does well

Practices fewer than half of Cars & Automotive peers use.

• CAA records limit who can issue certificatesCAA limits issuance to amazon.com, comodoca.com, digicert.com and others.7.8% of peers
• DNSSEC signedDNSSEC delegation (DS record) present.8.3% of peers
• DMARC policy enforces quarantine or rejectDMARC policy p=reject.41% of peers

What we saw

Homepage checked

https://221616.com/

Homepage response

HTTP 200

TLS

TLSv1.3, http/1.1

Certificate

DigiCert, 198-day validity, expiring 2027-01-28

CDN or edge

Cloudflare

DNS operators

Cloudflare

DMARC policy

p=reject

Homepage HTML

78 KB, gzip

Images on homepage

33 (png 15, webp 13, svg 5)

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

Compare with other Cars & Automotive sites

• aaaauto.cz57
• aaaauto.pl57
• platesmania.com58
• toyota.co.th58
• xpeng.com58

Cars & Automotive readiness benchmark