Skip to content
https://alltaxbooks.com

Infrastructure

· 17 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
88
GRADE
B
FIX
0
REVIEW
8
PASS
9
INFO
0
Probed from Madrid, Spain
200 OK
Checks
17
9 PASS 8 REVIEW
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
0/2 IPs match cert SAN
REVIEW
0/2 IPs match cert SAN
Info::
PTR for 63.176.8.218 does not match any cert SAN: ec2-63-176-8-218.eu-central-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 35.157.26.135 does not match any cert SAN: ec2-35-157-26-135.eu-central-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.
B
Multi-Resolver DNS Speed
Mean 91ms across 3 resolvers (spread 194ms)
REVIEW
Mean 91ms across 3 resolvers (spread 194ms)
Info::
Google: 26ms
Got: 26ms via 8.8.8.8:53
Info::
Cloudflare: 28ms
Got: 28ms via 1.1.1.1:53
Info::
Quad9: 220ms
Got: 220ms via 9.9.9.9:53
C
IPv6 Readiness
Action
No IPv6 support
REVIEW
No IPv6 support
Info::
No IPv6 (AAAA) records found
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No IPv6 Support
About 40% of internet users have IPv6. Consider adding AAAA records.

IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.

Why this matters

No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.

Source: Google IPv6 stats

B
TLS Certificate Expiry & Recommendations
52 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

52
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.
B
Health Check Endpoint
No conventional health endpoint found
REVIEW
No conventional health endpoint found
Info::
No conventional health endpoint found
Health endpoints (/health, /healthz, /status, /ping, /api/health) let uptime monitors, load balancers, and orchestration systems (Kubernetes, ECS, Fly.io) verify the service is alive. Marketing sites and small services often skip them legitimately; flagged as Info, not a failure. Probe results: /api/health: 404, /health: 404, /healthz: 404, /ping: 404, /status: 404.
A+
DNS Records
2 A records, 35 ms lookup
PASS
2 A records, 35 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 63.176.8.218, 35.157.26.135
Info::
No IPv6 (AAAA) records
Info::
4 nameserver(s) configured
Got: dns1.p03.nsone.net, dns3.p03.nsone.net, dns4.p03.nsone.net, dns2.p03.nsone.net
Info::
5 mail exchanger(s) configured
Info::
SPF record present in TXT
Info::
DNS resolution time: 35 ms
Got: 35 ms
A63.176.8.218, 35.157.26.135
AAAA—
CNAME—
NSdns1.p03.nsone.net, dns3.p03.nsone.net, dns4.p03.nsone.net, dns2.p03.nsone.net
MX
1 aspmx.l.google.com
5 alt2.aspmx.l.google.com
5 alt1.aspmx.l.google.com
10 alt4.aspmx.l.google.com
10 alt3.aspmx.l.google.com
TXT
apple-domain-verification=UOaocNejPQF9MNnj
SPF v=spf1 include:_spf.google.com ~all
CAALookup not available with standard resolver
Resolved in 35 ms
A+
Subdomain Takeover
No subdomain takeover risk detected
PASS
No subdomain takeover risk detected
Info::
No CNAME record present
A+
Redirect Chain
No redirects — direct access
PASS
No redirects — direct access
Info::
No redirects — direct access
Got: https://alltaxbooks.com

https://alltaxbooks.com

543 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://alltaxbooks.com200543 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: 900 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 900 B Sitemaps referenced 1 User-agents GPTBot, ChatGPT-User, ClaudeBot, PerplexityBot, Google-Extended, CCBot, Bytespider, * Blocking No — crawling allowed
User-agent: *
Allow: /
Disallow: /upload/
Disallow: /upload.html
Disallow: /api/
Disallow: /.netlify/functions/

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

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

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

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

User-agent: Google-Extended
Allow: /
Disallow: /upload/
Disallow: /upload.html
Disallow: /.netlify/functions/

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

User-agent: Bytespider
Allow: /
Disallow: /upload/
Disallow: /upload.html
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

176 days

March 23, 2027

SSL certificate

52 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

35.157.26.135

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 35.157.26.135
ASN AS16509 (AMAZON-02 - Amazon.com, Inc., US)
Provider AWS
Data source: rdap (0.3s)

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
HTTP Probe Timing
Total 677 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
35 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
33 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
142 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
580 ms
Total Time Total request time from DNS lookup through full response.
678 ms

Connection waterfall

DNS Lookup 35 ms TCP Connect 33 ms TLS Handshake 142 ms Server Processing 370 ms Content Transfer 98 ms
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: 01M3HW3QCAYGRDYFC6G6TG98CH
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: 01M3HW3QCAYGRDYFC6G6TG98CH
A+
CDN Cache Observability
Cache state: fresh (Age=0)
PASS
Cache state: fresh (Age=0)
Info::
CDN cache state observable via 1 header(s)
Got: age=0
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback