tennisoff.net

Readiness by lane

Green: tennisoff.net. Thin bar: Forums & Communities peer median.

Priority fixes for tennisoff.net

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

1. Priority 1 · Harden

   DMARC policy enforces quarantine or reject

   Observed: The DMARC policy for tennisoff.net 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.

   31% of Forums & Communities peers do this. Limit: Read from public DNS at the time of the check; records may have changed since.

   Guide: A Practical Website Health Check for Owners

2. Priority 2 · Accelerate

   Modern image formats in use

   Observed: The homepage had 29 images and none used WebP or AVIF.

   What to do: Serve WebP or AVIF with a JPEG or PNG fallback, either through an image CDN or by generating both formats at build time.

   30% of Forums & Communities peers do this.

   Guide: AVIF, WebP, JPEG, and PNG: Choose the Right Image Format

3. Priority 3 · Enable

   Canonical URL declared

   Observed: The homepage did not declare a canonical URL.

   What to do: Add a self-referencing canonical link to every indexable page, using the final https:// URL.

   61% of Forums & Communities peers do this.

   Guide: Canonical Tags: A Decision Guide for Duplicate URLs

4. Priority 4 · Enable

   Page language declared

   Observed: The homepage <html> element had no lang attribute.

   What to do: Set lang on the html element (for example lang="en") and on any sections in another language.

   88% of Forums & Communities peers do this.

   Guide: Website Accessibility Checklist for Owners

What tennisoff.net already does well

Practices fewer than half of Forums & Communities peers use.

• HSTS kept for at least a yearHSTS with a 365-day max-age.28% of peers
• No render-blocking scripts in <head>Head scripts load without blocking.41% of peers
• X-Content-Type-Options: nosniffnosniff header present.47% of peers

What we saw

Homepage checked

https://www.tennisoff.net/

Homepage response

HTTP 200

TLS

TLSv1.3, HTTP/2

Certificate

Let's Encrypt, 89-day validity, expiring 2026-12-28

DNS operators

Amazon Route 53

HSTS

max-age 365 days

DMARC policy

p=none

Homepage HTML

86 KB, gzip

Images on homepage

29 (png 18, jpg 10, gif 1)

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 Forums & Communities sites

• annelertoplandik.com60
• jkforum.net61
• joyreactor.cc61
• pantip.com61
• wiocha.pl61

Forums & Communities readiness benchmark