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https://alltaxbooks.com

Infrastructure

· 17 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
87
GRADE
B
FIX
1
REVIEW
6
PASS
10
INFO
0
Probed from Santa Clara, United States
200 OK
Checks
17
10 PASS 6 REVIEW 1 FIX
F
IPv6 Readiness
Action
IPv6 records exist but unreachable
FIX
IPv6 records exist but unreachable
Warning::
IPv6 DNS records exist but server is not reachable
Having AAAA records but an unreachable server is worse than no AAAA — clients may experience delays before falling back to IPv4.
Got: 2600:1f1c:446:4900::258, 2600:1f1c:446:4900::259
Info::
IPv6 connection error
Got: dial tcp6 [2600:1f1c:446:4900::258]:443: connect: network is unreachable
IPv6 Misconfigured
AAAA Records 2600:1f1c:446:4900::258, 2600:1f1c:446:4900::259 Connection UNREACHABLE

Having AAAA records but an unreachable server is worse than no AAAA — clients may experience delays before falling back to IPv4.

Why this matters

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)

B
DNSSEC
Unsigned (DNSSEC not deployed)
REVIEW
Unsigned (DNSSEC not deployed)
Info::
DNSSEC is not deployed
The zone is not DNSSEC-signed. Users on validating resolvers (Cloudflare 1.1.1.1, Quad9 9.9.9.9, growing default in mobile resolvers) get no protection against DNS spoofing for this domain. Most registrars now offer DNSSEC at a single click; consider enabling it for sites where authenticity matters (banking, healthcare, government).
B
CAA Records
No CAA records (any CA may issue certificates)
REVIEW
No CAA records (any CA may issue certificates)
Info::
No CAA records published
Without CAA records, any publicly-trusted CA can issue certificates for this domain. Adding a CAA record (`yourdomain. IN CAA 0 issue "letsencrypt.org"`) restricts issuance to CAs you authorize. Required by CAB Forum baseline since 2017; the default of 'any CA' is widely supported but is the broader attack surface for issuance fraud.
B
Reverse DNS
0/4 IPs match cert SAN
REVIEW
0/4 IPs match cert SAN
Info::
PTR for 13.52.188.95 does not match any cert SAN: ec2-13-52-188-95.us-west-1.compute.amazonaws.com
Common when behind a CDN or shared hosting (PTR points at the provider's hostname). Mismatch can also affect mail deliverability if this IP sends email -- many MTAs reject mail when forward+reverse DNS disagree.
Info::
PTR for 52.52.192.191 does not match any cert SAN: ec2-52-52-192-191.us-west-1.compute.amazonaws.com
Common when behind a CDN or shared hosting (PTR points at the provider's hostname). Mismatch can also affect mail deliverability if this IP sends email -- many MTAs reject mail when forward+reverse DNS disagree.
Info::
PTR lookup failed for 2600:1f1c:446:4900::258: lookup 2600:1f1c:446:4900::258: no such host
No reverse DNS record set for this IP. Common on bare cloud-VM IPs without provider-side PTR; not a security issue.
Info::
PTR lookup failed for 2600:1f1c:446:4900::259: lookup 2600:1f1c:446:4900::259: no such host
No reverse DNS record set for this IP. Common on bare cloud-VM IPs without provider-side PTR; not a security issue.
B
HTTP Probe Timing
Total 862 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
REVIEW
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
19 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
4 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
76 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
813 ms
Total Time Total request time from DNS lookup through full response.
862 ms

Connection waterfall

DNS Lookup 19 ms TCP Connect 4 ms TLS Handshake 76 ms Server Processing 713 ms Content Transfer 50 ms
B
TLS Certificate Expiry & Recommendations
51 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

51
days left
0d 30d 60d 90d+

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
B
Operational Status Page
No status page link detected
REVIEW
No status page link detected
Info::
No operational status page link detected
Status pages communicate planned maintenance and incidents to users -- a hallmark of operationally-mature services. Most SaaS teams publish one via Atlassian Statuspage, Instatus, BetterUptime, or a self-hosted Cachet. Smaller sites legitimately don't need one; flagged as Info, not a failure.
A+
DNS Records
2 A records, 22 ms lookup
PASS
2 A records, 22 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 13.52.188.95, 52.52.192.191
Info::
Has 2 IPv6 (AAAA) record(s)
Got: 2600:1f1c:446:4900::258, 2600:1f1c:446:4900::259
Info::
4 nameserver(s) configured
Got: dns1.p03.nsone.net, dns2.p03.nsone.net, dns3.p03.nsone.net, dns4.p03.nsone.net
Info::
5 mail exchanger(s) configured
Info::
SPF record present in TXT
Info::
DNS resolution time: 22 ms
Got: 22 ms
A13.52.188.95, 52.52.192.191
AAAA2600:1f1c:446:4900::258, 2600:1f1c:446:4900::259
CNAME—
NSdns1.p03.nsone.net, dns2.p03.nsone.net, dns3.p03.nsone.net, dns4.p03.nsone.net
MX
1 aspmx.l.google.com
5 alt1.aspmx.l.google.com
5 alt2.aspmx.l.google.com
10 alt4.aspmx.l.google.com
10 alt3.aspmx.l.google.com
TXT
SPF v=spf1 include:_spf.google.com -all
apple-domain-verification=UOaocNejPQF9MNnj
CAALookup not available with standard resolver
Resolved in 22 ms
A+
Subdomain Takeover
No subdomain takeover risk detected
PASS
No subdomain takeover risk detected
Info::
No CNAME record present
A+
Multi-Resolver DNS Speed
Mean 12ms across 3 resolvers (spread 17ms)
PASS
Mean 12ms across 3 resolvers (spread 17ms)
Info::
Cloudflare: 5ms
Got: 5ms via 1.1.1.1:53
Info::
Quad9: 9ms
Got: 9ms via 9.9.9.9:53
Info::
Google: 22ms
Got: 22ms via 8.8.8.8:53
A+
Redirect Chain
No redirects — direct access
PASS
No redirects — direct access
Info::
No redirects — direct access
Got: https://alltaxbooks.com

https://alltaxbooks.com

170 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://alltaxbooks.com200170 msHTTP/1.1Netlify
A+
Crawlability
robots.txt present, sitemap with 21 URLs
PASS
robots.txt present, sitemap with 21 URLs
Info::
robots.txt is present
Got: 2210 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 21 entries
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 2210 B Sitemaps referenced 1 User-agents CCBot, Bytespider, *, Googlebot, Google-Extended, DuckDuckBot, Applebot-Extended, GPTBot, PerplexityBot, Bingbot, Applebot, OAI-SearchBot, ChatGPT-User, ClaudeBot Blocking No — crawling allowed
# All Tax & Books — public search/AI discovery policy
# Public pages are crawlable. Private upload/API routes are excluded.

User-agent: *
Allow: /
Disallow: /upload/
Disallow: /upload.html
Disallow: /api/
Disallow: /.netlify/functions/

# Google Search
User-agent: Googlebot
Allow: /
Disallow: /upload/
Disallow: /upload.html
Disallow: /api/
Disallow: /.netlify/functions/

# Google Gemini / Vertex AI controls
User-agent: Google-Extended
Allow: /
Disallow: /upload/
Disallow: /upload.html
Disallow: /api/
Disallow: /.netlify/functions/

# Microsoft Bing / Copilot ecosystem
User-agent: Bingbot
Allow: /
Disallow: /upload/
Disallow: /upload.html
Disallow: /api/
Disallow: /.netlify/functions/

# DuckDuckGo
User-agent: DuckDuckBot
Allow: /
Disallow: /upload/
Disallow: /upload.html
Disallow: /api/
Disallow: /.netlify/functions/

# Apple Search / Siri / Spotlight / Safari
User-agent: Applebot
Allow: /
Disallow: /upload/
Disallow: /upload.html
Disallow: /api/
Disallow: /.netlify/functions/

# Apple generative-AI data-use control
User-agent: Applebot-Extended
Allow: /
Disallow: /upload/
Disallow: /upload.html
Disallow: /api/
Disallow: /.netlify/functions/

# OpenAI Search / ChatGPT Search
User-agent: OAI-SearchBot
Allow: /
Disallow: /upload/
Disallow: /upload.html
Disallow: /api/
Disallow: /.netlify/functions/

# OpenAI model-training crawler
User-agent: GPTBot
Allow: /
Disallow: /upload/
Disallow: /upload.html
Disallow: /api/
Disallow: /.netlify/functions/

# OpenAI user-triggered fetches
User-agent: ChatGPT-User
Allow: /
Disallow: /upload/
Disallow: /upload.html
Disallow: /api/
Disallow: /.netlify/functions/

# Anthropic
User-agent: ClaudeBot
Allow: /
Disallow: /upload/
Disallow: /upload.html
Disallow: /api/
Disallow: /.netlify/functions/

# Perplexity
User-agent: PerplexityBot
Allow: /
Disallow: /upload/
Disallow: /upload.html
Disallow: /api/
Disallow: /.netlify/functions/

# Common Crawl
User-agent: CCBot
Allow: /
Disallow: /upload/
Disallow: /upload.html
Disallow: /api/
Disallow: /.netlify/functions/

# ByteDance
User-agent: Bytespider
Allow: /
Disallow: /upload/
Disallow: /upload.html
Disallow: /api/
Disallow: /.netlify/functions/

Sitemap: https://alltaxbooks.com/sitemap.xml
sitemap.xml 200 OK
Type URL Set URLs 21 entries Valid XML Yes
Sample URLs:
A+
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
PASS
www/non-www, trailing slash, HTTP→HTTPS
Info::
www/non-www redirect configured correctly (preferred: non-www)
Info::
HTTP correctly redirects to HTTPS permanently
Got: HTTP 301

www / non-www

301https://www.alltaxbooks.com/
200https://alltaxbooks.com/

Preferred variant: non-www

HTTP → HTTPS

301http://alltaxbooks.com/ → https://alltaxbooks.com/

Consistent

A+
Domain Intelligence
alltaxbooks.com — via Porkbun LLC, 6 months old, hosted on AWS
PASS
alltaxbooks.com — via Porkbun LLC, 6 months old, hosted on AWS
Info::
Domain registered until Mar 23, 2027 (5 months remaining)
Info::
DNSSEC is not enabled
DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.
Info::
Registrar: Porkbun LLC
Warning::
Registrar lock is NOT enabled
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.
Info::
Hosting: AWS
Got: AS16509
Domain expiry

175 days

March 23, 2027

SSL certificate

51 days

Issued by Let's Encrypt

Domain age

6 months

Registered March 23, 2026

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

AWS

ASN AS16509

13.52.188.95

Registrar

Porkbun LLC

Unlocked 4 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable DNSSEC to protect visitors from DNS spoofing
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar Porkbun LLC
Created March 23, 2026 (6 months ago)
Expires March 23, 2027 (5 months)
Last Updated June 22, 2026
Name Servers dns1.p03.nsone.net, dns2.p03.nsone.net, dns3.p03.nsone.net, dns4.p03.nsone.net
DNSSEC Not enabled
Hosting
IP Address 13.52.188.95
ASN AS16509 (AMAZON-02 - Amazon.com, Inc., US)
Provider AWS
Data source: rdap (0.2s)

DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.

Why this matters

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.

Why this matters

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

A
CDN & Delivery
Netlify ("Netlify Edge"; fwd=miss; fwd-status=200; stored)
PASS
Netlify ("Netlify Edge"; fwd=miss; fwd-status=200; stored)
Info::
Document is served via Netlify CDN
Got: x-nf-request-id: 01M3MGRGAX0T9CAJPZ9HH9VA1W
Info::
CDN cache status: "Netlify Edge"; fwd=miss; fwd-status=200; stored
Document served via CDN: Netlify
Provider Netlify Cache Status "Netlify Edge"; fwd=miss; fwd-status=200; stored Evidence x-nf-request-id: 01M3MGRGAX0T9CAJPZ9HH9VA1W
A+
CDN Cache Observability
Cache state: Age=1s
PASS
Cache state: Age=1s
Info::
CDN cache state observable via 1 header(s)
Got: age=1
A+
Health Check Endpoint
Health endpoint at https://alltaxbooks.com/health (HTTP 200)
PASS
Health endpoint at https://alltaxbooks.com/health (HTTP 200)
Info::
Public health endpoint at https://alltaxbooks.com/health
Got: https://alltaxbooks.com/health
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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