Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.FIPv6 ReadinessActionIPv6 records exist but unreachableFIX
Having AAAA records but an unreachable server is worse than no AAAA — clients may experience delays before falling back to IPv4.
Advertising IPv6 (AAAA records) without a reachable server means IPv6-preferring clients silently fail every connection.
Learn more ▾ ▴
Modern browsers prefer IPv6 if AAAA exists (Happy Eyeballs algorithm). If the IPv6 server isn't reachable, browsers fall back to IPv4 — but with seconds of added latency per request. Either fix IPv6 reachability or remove the AAAA records.
Source: RFC 8305 (Happy Eyeballs)
BURL Variantswww/non-www, trailing slash, HTTP→HTTPSREVIEW
www / non-www
HTTP → HTTPS
HTTP version does not redirect to HTTPS
BTLS Certificate Expiry & Recommendations89 days until leaf cert expires — 3 issues to addressREVIEW
Certificate validity
Recommended actions
- Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
- Enable DNSSEC on your domain for DNS spoofing protection
- Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
BCDN & DeliveryCloudflareREVIEW
A+DNS Records2 A records, 129 ms lookupPASS
| A | 104.18.39.21, 172.64.148.235 |
| AAAA | 2a06:98c1:3108::ac40:94eb, 2a06:98c1:3107::6812:2715 |
| CNAME | — |
| NS | nicole.ns.cloudflare.com, austin.ns.cloudflare.com |
| MX | 10 aspmx.l.google.com 20 alt2.aspmx.l.google.com 20 alt1.aspmx.l.google.com 30 aspmx3.googlemail.com 30 aspmx2.googlemail.com 30 aspmx4.googlemail.com 30 aspmx5.googlemail.com |
| TXT | — |
| CAA | Lookup not available with standard resolver |
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.
SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.
Without SPF, receiving servers can't validate sending IPs — your domain is easier to spoof in phishing.
Learn more ▾ ▴
SPF complements DMARC. Both should be published. SPF records list authorized sending IPs (e.g., `v=spf1 include:_spf.google.com ~all` for Google Workspace). After publishing, verify in Google Postmaster Tools or mxtoolbox.
Source: RFC 7208 (SPF)
A+Redirect Chain0 redirect(s), 21 ms totalPASS
https://css-tricks.com
21 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://css-tricks.com | 403 | 21 ms | HTTP/1.1 | cloudflare |
ACrawlabilityrobots.txt present, no sitemapPASS
A sitemap helps search engines discover and index your pages more efficiently.
No sitemap.xml — Google relies on crawl-graph discovery alone, slowing indexing of deep or fresh URLs.
Learn more ▾ ▴
A sitemap accelerates Google's discovery of new and updated content. Most CMSes auto-generate one; static-site frameworks need a build-step plugin. Reference it from robots.txt and submit in Search Console to confirm Google can fetch it.
Source: sitemaps.org / Google Search Central
# CSS-Tricks robots.txt
# Last updated: January 2026
# Allow all search engines and AI crawlers to access content
User-agent: *
Allow: /
# Allow specific AI crawlers explicitly
User-agent: GPTBot
Allow: /
User-agent: ChatGPT-User
Allow: /
User-agent: CCBot
Allow: /
User-agent: anthropic-ai
Allow: /
User-agent: ClaudeBot
Allow: /
User-agent: Google-Extended
Allow: /
User-agent: PerplexityBot
Allow: /
User-agent: Bytespider
Allow: /
# Block common problem crawlers (spam, scrapers)
User-agent: SemrushBot
Disallow: /
User-agent: AhrefsBot
Disallow: /
User-agent: DotBot
Disallow: /
# Disallow admin and private areas
User-agent: *
Disallow: /wp-admin/
Disallow: /wp-login.php
Disallow: /cgi-bin/
Disallow: /search?
Disallow: /*?s=
Disallow: /cart/
Disallow: /checkout/
# Allow WordPress uploads (images, media)
Allow: /wp-content/uploads/
# Prevent indexing of duplicate content
Disallow: /*?replytocom=
Disallow: /tag/*/page/
Disallow: /category/*/page/
# Crawl delay for aggressive bots
User-agent: *
Crawl-delay: 1
# Sitemap location
Sitemap: https://css-tricks.com/sitemap.xml
Sitemap: https://css-tricks.com/post-sitemap.xml
Sitemap: https://css-tricks.com/page-sitemap.xml
No sitemap found
Adding a sitemap helps search engines discover your pages.
A+Domain Intelligencecss-tricks.com — via MarkMonitor Inc., 19 years oldPASS
2210 days
July 4, 2032
89 days
Issued by Google Trust Services
19 years
Registered July 4, 2007
Not enabled
Protects against DNS spoofing
Unknown
2a06:98c1:3108::ac40:94eb
MarkMonitor Inc.
Expiry timeline
Recommended actions
- Enable DNSSEC to protect visitors from DNS spoofing
DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.
Without DNSSEC, an attacker who can poison your DNS can hijack your domain — and SSL certs alone don't stop them.
Learn more ▾ ▴
DNSSEC adds cryptographic signatures to DNS records, preventing forged responses from poisoning resolver caches. Without it, an attacker who controls the network path can redirect your domain to a malicious server before any HTTPS handshake happens. Most modern registrars (Cloudflare, Google Domains, Route 53) enable it with one toggle.
Source: ICANN / RFC 4033