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https://penguinrandomhouse.com

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
84
GRADE
B
FIX
1
REVIEW
3
PASS
5
INFO
0
Probed from Madrid, Spain
301 Moved Permanently
Checks
9
5 PASS 3 REVIEW 1 FIX
D
CDN & Delivery
Action
No CDN detected
FIX
No CDN detected
Warning::
No CDN detected
A CDN can significantly improve load times for users around the world by caching content at edge nodes closer to them.
No CDN detected

Consider using a CDN to improve global delivery speed and reduce origin load.

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
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
REVIEW
www/non-www, trailing slash, HTTP→HTTPS
Critical::
Both www and non-www versions serve content
Got: Both variants return 200 Expected: One variant 301-redirects to the other
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.penguinrandomhouse.com/
200https://penguinrandomhouse.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://penguinrandomhouse.com/ → https://www.penguinrandomhouse.com/

Consistent

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

Certificate validity

263
days left
0d 30d 60d 90d+

Recommended actions

  • Prefer TLS 1.3 — TLS 1.2 is acceptable but TLS 1.3 removes RSA key exchange and improves latency
  • Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
  • Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
A
DNS Records
1 A records, 1029 ms lookup
PASS
1 A records, 1029 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 170.171.208.137
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
No IPv6 (AAAA) records
Info::
4 nameserver(s) configured
Got: ns-362.awsdns-45.com, ns-643.awsdns-16.net, ns-1709.awsdns-21.co.uk, ns-1259.awsdns-29.org
Info::
2 mail exchanger(s) configured
Info::
CAA records not checked
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Info::
SPF record present in TXT
Warning::
DNS resolution is slow (1029 ms)
Slow DNS adds latency to every page load. Consider a faster DNS provider.
Got: 1029 ms
A170.171.208.137
AAAA—
CNAME—
NSns-362.awsdns-45.com, ns-643.awsdns-16.net, ns-1709.awsdns-21.co.uk, ns-1259.awsdns-29.org
MX
10 us-smtp-inbound-1.mimecast.com
10 us-smtp-inbound-2.mimecast.com
TXT
SPF v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all
sophos-domain-verification=30c16c4ad4dd85043d6766d195b3be1bf04c9425e55a4a79745bd...
d240bb6782951c680216e3b2c275a67a287ab413a4dbc83ff6
atlassian-domain-verification=Kl3ByU1tsfV9fKiC7TDDZYz1uCeTeUo0SSEh5SitZ9q99Ua74O...
anthropic-domain-verification-p3yxqz=0oTx7Z8mJYN8MCnVfLRuy7xrz
twilio-domain-verification=fc6fe5f3866856223b427fe22f87cacc
openai-domain-verification=dv-Rhm7Hg5yRtoNsmysb1sZR4hb
p^80Ofvy%178DnED&JH$OktbSDSDHdBu8r5TXqXJUzrLTNplO6PB1VAb%#xV06wEKl7lOoFd2erdL@$w...
canva-site-verification=qrGQ4gxWAdHknibYOR88zw
HmQrtF+YeGABOOs4sUIGNzx5oH/hxa/uuKITM72aP2D3Mmo45+IYTHRRNErkCFI5FluDKT7Og9fYZwF4...
applause-verification:e7f9bc17-1978-415a-83ab-955ebc93e7eb
apple-domain-verification=fSsk2qTskZIXUkhu
asv=300738b15ca5d787a896887a6179da76
miro-verification=20deb2e76b80e8360f078ce72b4c1b020ccbe7e1
CAALookup not available with standard resolver
Resolved in 1029 ms

Multiple A records provide failover if one server goes down.

Why this matters

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

CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.

Why this matters

Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.

Slow DNS adds latency to every page load. Consider a faster DNS provider.

Why this matters

DNS resolution is slow — anycast DNS providers (Cloudflare, Route 53) typically resolve <50ms globally.

Source: DNS performance benchmarks

A
Redirect Chain
1 redirect(s), 525 ms total
PASS
1 redirect(s), 525 ms total
Info::
Single redirect
Got: https://penguinrandomhouse.com → https://www.penguinrandomhouse.com/ (301)
Info::
WWW normalization redirect
Info::
Redirect overhead: 525 ms total
Got: 525 ms

https://penguinrandomhouse.com

397 ms · HTTP/1.0

301

https://www.penguinrandomhouse.com/

127 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://penguinrandomhouse.com301397 msHTTP/1.0
2https://www.penguinrandomhouse.com/200127 msHTTP/1.1nginx

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 551 URLs
PASS
robots.txt present, sitemap with 551 URLs
Info::
robots.txt is present
Got: 321 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 551 entries
Info::
Sitemap index with 551 child sitemaps
Info::
robots.txt does not reference a sitemap
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

Why this matters

robots.txt omits Sitemap: directive — crawlers must fetch /sitemap.xml by convention; reliable but missing the explicit hint.

Source: sitemaps.org

robots.txt 200 OK
Size 321 B Sitemaps referenced 0 User-agents * Blocking No — crawling allowed
User-agent: *
Disallow: /wp-admin/
Disallow: /wp-includes/
Disallow: /wp-content/plugins/
Disallow: /wp-content/cache/
Disallow: /trackback/
Disallow: /search/
Disallow: /prh-internal-news/
Disallow: /interactive/reading-preference
Allow: /wp-admin/admin-ajax.php
Allow: /wp-includes/css/dist/block-library/style.min.css
sitemap.xml 200 OK
Type Sitemap Index URLs 551 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
penguinrandomhouse.com — via CSC Corporate Domains, Inc., 13 years, 8 months old, hosted on RANDOMHOUSE - Random House, Inc., US
PASS
penguinrandomhouse.com — via CSC Corporate Domains, Inc., 13 years, 8 months old, hosted on RANDOMHOUSE - Random House, Inc., US
Info::
Domain registered until Oct 25, 2027 (1 years, 6 months remaining)
Info::
DNSSEC is enabled
Info::
Registrar: CSC Corporate Domains, Inc.
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: RANDOMHOUSE - Random House, Inc., US
Got: AS11790
Domain expiry

497 days

October 25, 2027

SSL certificate

263 days

Issued by Sectigo Limited

Domain age

13 years, 8 months

Registered October 25, 2012

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

RANDOMHOUSE - Random House, Inc., US

ASN AS11790

170.171.208.137

Registrar

CSC Corporate Domains, Inc.

Unlocked 4 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar CSC Corporate Domains, Inc.
Created October 25, 2012 (13 years, 8 months ago)
Expires October 25, 2027 (1 years, 6 months)
Last Updated October 21, 2025
Name Servers ns-1259.awsdns-29.org, ns-1709.awsdns-21.co.uk, ns-362.awsdns-45.com, ns-643.awsdns-16.net
DNSSEC Enabled
Hosting
IP Address 170.171.208.137
ASN AS11790 (RANDOMHOUSE - Random House, Inc., US)
Provider RANDOMHOUSE - Random House, Inc., US
Data source: rdap (0.4s)

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 429 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
29 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
98 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
203 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
429 ms
Total Time Total request time from DNS lookup through full response.
429 ms

Connection waterfall

DNS Lookup 29 ms TCP Connect 98 ms TLS Handshake 203 ms Server Processing 99 ms Content Transfer 0 ms
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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