Infrastructure
· 17 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)
BDNSSECUnsigned (DNSSEC not deployed)REVIEW
BCAA RecordsNo CAA records (any CA may issue certificates)REVIEW
BReverse DNS0/2 IPs match cert SANREVIEW
CMulti-Resolver DNS SpeedActionMean 110ms across 3 resolvers (spread 210ms)REVIEW
BTLS Certificate Expiry & Recommendations42 days until leaf cert expires — 3 issues to addressREVIEW
Certificate validity
Recommended actions
- Submit your domain to hstspreload.org to be added to the Chrome preload list
- 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
BOperational Status PageNo status page link detectedREVIEW
A+DNS Records1 A records, 134 ms lookupPASS
| A | 54.232.119.62 |
| AAAA | 2600:1f1e:7c1:c300::258 |
| CNAME | — |
| NS | dns1.p03.nsone.net, dns2.p03.nsone.net, dns3.p03.nsone.net, dns4.p03.nsone.net |
| MX | 1 aspmx.l.google.com 5 alt2.aspmx.l.google.com 5 alt1.aspmx.l.google.com 10 alt3.aspmx.l.google.com 10 alt4.aspmx.l.google.com |
| TXT | SPF v=spf1 include:_spf.google.com -all apple-domain-verification=UOaocNejPQF9MNnj |
| CAA | Lookup not available with standard resolver |
Multiple A records provide failover if one server goes down.
Single A record means a single point of failure — if that IP goes down, your site is unreachable until DNS TTL expires.
Learn more ▾ ▴
Add multiple A records for round-robin failover, or use a managed DNS provider with health-checked failover (Route 53, Cloudflare, NS1). Short TTL (60-300s) lets clients recover faster on outages.
Source: SRE practice / DNS architecture
A+Subdomain TakeoverNo subdomain takeover risk detectedPASS
A+Redirect ChainNo redirects — direct accessPASS
https://alltaxbooks.com
564 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://alltaxbooks.com | 200 | 564 ms | HTTP/1.1 | Netlify |
A+Crawlabilityrobots.txt present, sitemap with 84 URLsPASS
# All Tax & Books — public search/AI discovery policy
# Public pages are crawlable. Internal API routes are excluded.
User-agent: *
Allow: /
Disallow: /api/
# Google Search
User-agent: Googlebot
Allow: /
Disallow: /api/
# Google Gemini / Vertex AI controls
User-agent: Google-Extended
Allow: /
Disallow: /api/
# Microsoft Bing / Copilot ecosystem
User-agent: Bingbot
Allow: /
Disallow: /api/
# DuckDuckGo
User-agent: DuckDuckBot
Allow: /
Disallow: /api/
# Apple Search / Siri / Spotlight / Safari
User-agent: Applebot
Allow: /
Disallow: /api/
# Apple generative-AI data-use control
User-agent: Applebot-Extended
Allow: /
Disallow: /api/
# OpenAI Search / ChatGPT Search
User-agent: OAI-SearchBot
Allow: /
Disallow: /api/
# OpenAI model-training crawler
User-agent: GPTBot
Allow: /
Disallow: /api/
# OpenAI user-triggered fetches
User-agent: ChatGPT-User
Allow: /
Disallow: /api/
# Anthropic
User-agent: ClaudeBot
Allow: /
Disallow: /api/
# Perplexity
User-agent: PerplexityBot
Allow: /
Disallow: /api/
# Common Crawl
User-agent: CCBot
Allow: /
Disallow: /api/
# ByteDance
User-agent: Bytespider
Allow: /
Disallow: /api/
Sitemap: https://alltaxbooks.com/sitemap.xml
A+URL Variantswww/non-www, trailing slash, HTTP→HTTPSPASS
www / non-www
Preferred variant: non-www
HTTP → HTTPS
Consistent
A+Domain Intelligencealltaxbooks.com — via Porkbun LLC, 6 months oldPASS
155 days
March 23, 2027
42 days
Issued by Let's Encrypt
6 months
Registered March 23, 2026
Not enabled
Protects against DNS spoofing
Unknown
2600:1f1e:7c1:c300::258
Porkbun LLC
Expiry timeline
Recommended actions
- Enable DNSSEC to protect visitors from DNS spoofing
- Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
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
The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.
Without registrar lock, an attacker who phishes your registrar credentials can transfer the domain in minutes — total brand hijack.
Learn more ▾ ▴
Registrar lock (clientTransferProhibited, clientUpdateProhibited, clientDeleteProhibited) requires extra verification before any transfer/update/delete. Every major registrar offers it free. Combined with 2FA on your registrar account, it's the strongest defense against domain hijacking.
Source: ICANN / domain-security best practice