Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Probed from Amsterdam, Netherlands

301 Moved Permanently

Checks

5 PASS 3 REVIEW 1 FIX

CDN & Delivery

Action

No CDN detected

FIX

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.

Redirect Chain

2 redirect(s), 615 ms total

REVIEW

2 redirect(s), 615 ms total

2 redirects before reaching final URL

Each redirect adds latency. Try to minimize the chain to 1 hop.

HTTP to HTTPS redirect present

WWW normalization redirect

2-hop chain could be reduced to 1 hop

Redirect directly from https://randomhouse.com to https://www.penguinrandomhouse.com/

Redirect overhead: 615 ms total

Got: 615 ms

Cross-domain redirect detected

https://randomhouse.com

380 ms · HTTP/1.1

301

http://www.randomhouse.com/

209 ms · HTTP/1.1

301

https://www.penguinrandomhouse.com/

25 ms · HTTP/1.1 FINAL

#	URL	Status	Time	Protocol	Server
1	https://randomhouse.com	301	380 ms	HTTP/1.1
2	http://www.randomhouse.com/	301	209 ms	HTTP/1.1
3	https://www.penguinrandomhouse.com/	200	25 ms	HTTP/1.1	nginx

See the visual redirect chain in the HTTP Probe tab →

Each redirect adds latency. Try to minimize the chain to 1 hop.

Why this matters

Redirect chain — each hop adds latency; combine into one redirect where possible.

Source: Google Search Central / web.dev

Redirect directly from https://randomhouse.com to https://www.penguinrandomhouse.com/

Why this matters

Redirect chain could be flattened to one hop — server config tweak removes intermediate latency.

Source: web.dev

IPv6 Readiness

Action

No IPv6 support

REVIEW

No IPv6 support

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

TLS Certificate Expiry & Recommendations

190 days until leaf cert expires — 3 issues to address

REVIEW

Certificate validity

190

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, 38 ms lookup

PASS

1 A records, 38 ms lookup

Resolves to 1 IPv4 address(es)

Got: 170.171.208.12

Single A record — no DNS redundancy

Multiple A records provide failover if one server goes down.

No IPv6 (AAAA) records

2 nameserver(s) configured

Got: ns1.prh.com, ns2.prh.com

2 mail exchanger(s) configured

CAA records not checked

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

SPF record present in TXT

DNS resolution time: 38 ms

Got: 38 ms

A	170.171.208.12
AAAA	—
CNAME	—
NS	ns1.prh.com, ns2.prh.com
MX	10 us-smtp-inbound-2.mimecast.com 10 us-smtp-inbound-1.mimecast.com
TXT	6981mi0mv7p4b1rigrrut2ta94 qhp99ovh4or2b4ie7ju569mgla apple-domain-verification=yZTS6KwXN8ggGgKb SPF v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all globalsign-domain-verification=KaParXxs1OHDy7o8CMbPpHBN-2m_mzwdPqKMMQ66a6 9p6r+17hOkZxqzw9YnQt5WnFkAdxglNU7NbMKWtDLIVdqAKH3yxzzO/ya681xc+i5K/bQiZcApmvQPjm... aq+sKMbT9943h3QSyo5+uII4luIxhbO3jB4lic8NRan8KPYsKxvbPXUIkf/39pgvxkmsLS+fsyY8gtU6... mMeYa24w85lzH0nHjojrOfMGlQcEy8UNTqASxsQNWXfiJQk/BiUD1OOz/Sck5v1sEZpHzKJrtxgZw/3t... atlassian-domain-verification=Kl3ByU1tsfV9fKiC7TDDZYz1uCeTeUo0SSEh5SitZ9q99Ua74O...
CAA	Lookup not available with standard resolver

Resolved in 38 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.

A+

Crawlability

robots.txt present, sitemap with 2 URLs

PASS

robots.txt present, sitemap with 2 URLs

robots.txt is present

Got: 8303 bytes

sitemap.xml is present

sitemap.xml is valid XML

sitemap.xml contains 2 entries

Sitemap index with 2 child sitemaps

robots.txt does not reference a 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 8303 B Sitemaps referenced 0 User-agents * Blocking No — crawling allowed

User-agent: *


Disallow: /cgi-bin/

Disallow: /mt32/

Disallow: /delrey/starwars/catalog/

Disallow: /livinglanguage/registration/

Disallow: /livinglanguage/trial/

Disallow: /livinglanguage/coupon/

Disallow: /livinglanguage/associates/

Disallow: /livinglanguage/online-spanish-course15.html

Disallow: /livinglanguage/online-french-course15.html

Disallow: /livinglanguage/online-german-course15.html

Disallow: /livinglanguage/online-italian-course15.html

Disallow: /livinglanguage/online-english-course15.html

Disallow: /rhpg/toktwd08/

Disallow: /randomhouse/

Disallow: /randomhouse.old/

Disallow: /wonderama/

Disallow: /pantheon/graphicnovels/home.pperl/

Disallow: /images/dyn/

Disallow: /catalog/catalog_cover.pperl

Disallow: /catalog/catalog_cover_100.pperl

Disallow: /catalog/catalog_cover_450.pperl

Disallow: /author/atom.pperl

Disallow: /author/rss.pperl

Disallow: /author/rss.php

Disallow: /author/rss2.php

Disallow: /author/xml_list.pperl

Disallow: /catalog/results.pperl

Disallow: /gm/

Disallow: /BB/read/catalog/display.pperl

Disallow: /anchor/catalog/display.pperl

Disallow: /bantamdell/catalog/display.pperl

Disallow: /bantamdell/kinsella/books/display.pperl

Disallow: /bantamdell/lqotw/display.pperl

Disallow: /bantamdell/wonderama/kinsella/books/display.pperl

Disallow: /broadway/blackink/catalog/display.pperl

Disallow: /broadway/catalog/display.pperl

Disallow: /broadway/parenting/catalog/display.pperl

Disallow: /catalog/affiliates/display.pperl

Disallow: /category/fodors/display.pperl

Disallow: /crown/devilinthewhitecity/catalog/display.pperl

Disallow: /crown/houseofcollectibles/catalog/display.pperl

Disallow: /crown/maidenscrown/catalog/display.pperl

Disallow: /delrey/catalog/display.pperl

Disallow: /delrey/manga/catalog/display.pperl

Disallow: /delrey/starwars/catalog/display.pperl

Disallow: /doubleday/catalog/display.pperl

Disallow: /doubleday/currency/catalog/display.pperl

Disallow: /features/auletta/binchy/catalog/display.pperl

Disallow: /features/billbryson/bb_title/display.pperl

Disallow: /features/bradford/catalog/display.pperl

Disallow: /features/grisham/catalog/display.pperl

Disallow: /features/grisham/jg_subnav/display.pperl

Disallow: /features/grisham/jg_title/display.pperl

Disallow: /features/janehamilton/books/display.pperl

Disallow: /features/largeprint/catalog/display.pperl

Disallow: /features/lurlene/catalog/display.pperl

Disallow: /features/patriciareillygiff/catalog/display.pperl

Disallow: /features/steel/bookshelf/display.pperl

Disallow: /features/weir/catalog/display.pperl

Disallow: /golden/catalog/display.pperl

Disallow: /houseofcollectibles/oldsite/catalog/display.pperl

Disallow: /isyndicate/catalog/display.pperl

Disallow: /kids/arthur/catalog/display.pperl

Disallow: /kids/berenstainbears/catalog/display.pperl

Disallow: /kids/bookreportnow/catalog/display.pperl

Disallow: /kids/disney.old/catalog/display.pperl

Disallow: /kids/junieb/catalog/display.pperl

Disallow: /kids/natethegreat/catalog/display.pperl

Disallow: /kids/thomas/catalog/display.pperl

Disallow: /kids/trixiebelden/catalog/display.pperl

Disallow: /kids/vandraanen/sammykeyes/books/display.pperl

Disallow: /knopf/catalog/display.pperl

Disallow: /knopf/classics/catalog/display.pperl

Disallow: /knopf/cooking/catalog/display.pperl

Disallow: /knopf/nature/catalog/display.pperl

Disallow: /knopf/travel/catalog/display.pperl

Disallow: /largeprint/catalog/display.pperl

Disallow: /modernlibrary/library/display.pperl

Disallow: /morganroad/catalog/display.pperl

Disallow: /nanatalese/catalog/display.pperl

Disallow: /pantheon/catalog/display.pperl

Disallow: /pantheon/graphicnovels/catalog/display.pperl

Disallow: /rhpg/catalog/display.pperl

Disallow: /rhpg/espnbooks/display.pperl

Disallow: /rhpg/rc.old/library/display.pperl

Disallow: /rhpg/rc/library/display.pperl

Disallow: /schocken/catalog/display.pperl

Disallow: /spiegelandgrau/catalog/display.pperl

Disallow: /sweetvalley/catalog/display.pperl

Disallow: /teachers/themes/display.pperl

Disallow: /teens/dyn_catalog/display.pperl

Disallow: /teens/flash/dyn_catalog/display.pperl

Disallow: /valuepublishing/catalog/old/display.pperl

Disallow: /vintage/blacklizard/catalog/display.pperl

Disallow: /vintage/catalog/display.pperl

Disallow: /waterbrook/catalog/display.pperl

Disallow: /waterbrook/shaw/catalog/display.pperl

Disallow: /BB/read/catalog/results.pperl

Disallow: /acmart/catalog/results.pperl

Disallow: /acmart/guides/results.pperl

Disallow: /acmart/results.pperl

Disallow: /anchor/catalog/results.pperl

Disallow: /bantamdell/catalog/results.pperl

Disallow: /bantamdell/news/results.pperl

Disallow: /bantamdell/results.pperl

Disallow: /broadway/blackink/catalog/results.pperl

Disallow: /broadway/browse/results.pperl

Disallow: /broadway/catalog/results.pperl

Disallow: /broadway/parenting/catalog/results.pperl

Disallow: /category/backtoschool/results.pperl

Disallow: /category/fodors/results.pperl

Disallow: /crown/clarksonpotter/catalog/results.pperl

Disallow: /crown/houseofcollectibles/catalog/results.pperl

Disallow: /crown/maidenscrown/catalog/results.pperl

Disallow: /crown8106/news/results.pperl

Disallow: /delrey/authors/results.pperl

Disallow: /delrey/catalog/results.pperl

Disallow: /delrey/manga/catalog/results.pperl

Disallow: /delrey/starwars/catalog/results.pperl

Disallow: /doubleday/catalog/results.pperl

Disallow: /doubleday/currency/catalog/results.pperl

Disallow: /doubleday/religion/results.pperl

Disallow: /features/aquindlen/results.pperl

Disallow: /features/auletta/binchy/catalog/results.pperl

Disallow: /features/bradford/catalog/results.pperl

Disallow: /features/ea-sports/results.pperl

Disallow: /features/largeprint/catalog/results.pperl

Disallow: /features/results_home/results.pperl

Disallow: /features/starwars/results.pperl

Disallow: /features/steel/bookshelf/results.pperl

Disallow: /features/traveldetective/results.pperl

Disallow: /features/trigiani/results.pperl

Disallow: /features/warhammer/atlas/results.pperl

Disallow: /features/warhammer/bundle/results.pperl

Disallow: /features/warhammer/eGuide/results.pperl

Disallow: /features/warhammer/ea-coupon/results.pperl

Disallow: /features/warhammer/results.pperl

Disallow: /features/weir/catalog/results.pperl

Disallow: /golden/catalog/results.pperl

Disallow: /highschool/catalog/results.pperl

Disallow: /houseofcollectibles/oldsite/catalog/results.pperl

Disallow: /isyndicate/catalog/results.pperl

Disallow: /kids/berenstainbears/catalog/results.pperl

Disallow: /kids/bookreportnow/catalog/results.pperl

Disallow: /kids/catalog/results.pperl

Disallow: /kids/disney.old/catalog/results.pperl

Disallow: /kids/thomas/catalog/results.pperl

Disallow: /knopf/authors/results.pperl

Disallow: /knopf/catalog/results.pperl

Disallow: /knopf/classics/catalog/results.pperl

Disallow: /knopf/cooking/catalog/results.pperl

Disallow: /knopf/nature/catalog/results.pperl

Disallow: /knopf/travel/catalog/results.pperl

Disallow: /largeprint/catalog/results.pperl

Disallow: /livinglanguage/catalog/results.pperl

Disallow: /modernlibrary/library/results.pperl

Disallow: /nanatalese/authors/results.pperl

Disallow: /nanatalese/catalog/results.pperl

Disallow: /pantheon/catalog/results.pperl

Disallow: /pantheon/graphicnovels/catalog/results.pperl

Disallow: /princetonreview/catalog/results.pperl

Disallow: /princetonreview/xml-catalog/catalog/results.pperl

Disallow: /rhpg/authors/results.pperl

Disallow: /rhpg/catalog/results.pperl

Disallow: /rhpg/category/results.pperl

Disallow: /rhpg/rc.old/library/results.pperl

Disallow: /rhpg/rc/library/results.pperl

Disallow: /rhpg/rgg/results.pperl

Disallow: /schocken/authors/results.pperl

Disallow: /schocken/catalog/results.pperl

Disallow: /teachers/authors/results.pperl

Disallow: /teachers/catalog/results.pperl

Disallow: /teachers/guides/results.pperl

Disallow: /teachers/themes/results.pperl

Disallow: /teens/authors/results.pperl

Disallow: /teens/catalog/results.pperl

Disallow: /valuepublishing/catalog/results.pperl

Disallow: /vintage/blacklizard/catalog/results.pperl

Disallow: /vintage/catalog/results.pperl

Disallow: /waterbrook/catalog/results.pperl

Disallow: /waterbrook/shaw/catalog/results.pperl

Allow: /

sitemap.xml 200 OK

Type Sitemap Index URLs 2 entries Valid XML Yes

Child Sitemaps:

A+

URL Variants

www/non-www, trailing slash, HTTP→HTTPS

PASS

www/non-www, trailing slash, HTTP→HTTPS

www/non-www redirect configured correctly (preferred: non-www)

HTTP correctly 301-redirects to HTTPS

www / non-www

301https://www.randomhouse.com/

200https://randomhouse.com/

Preferred variant: non-www

HTTP → HTTPS

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

Consistent

A+

Domain Intelligence

randomhouse.com — via CSC Corporate Domains, Inc., 33 years old, hosted on RANDOMHOUSE - Random House, Inc., US

PASS

randomhouse.com — via CSC Corporate Domains, Inc., 33 years old, hosted on RANDOMHOUSE - Random House, Inc., US

Domain registered until Oct 11, 2026 (5 months remaining)

DNSSEC is enabled

Registrar: CSC Corporate Domains, Inc.

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.

Hosting: RANDOMHOUSE - Random House, Inc., US

Got: AS11790

Domain expiry

117 days

October 11, 2026

SSL certificate

190 days

Issued by Sectigo Limited

Domain age

33 years

Registered October 12, 1993

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

RANDOMHOUSE - Random House, Inc., US

ASN AS11790

170.171.208.12

Registrar

CSC Corporate Domains, Inc.

Unlocked 2 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 12, 1993 (33 years ago)

Expires October 11, 2026 (5 months)

Last Updated August 30, 2024

Name Servers ns1.prh.com, ns2.prh.com

DNSSEC Enabled

Hosting

IP Address 170.171.208.12

ASN AS11790 (RANDOMHOUSE - Random House, Inc., US)

Provider RANDOMHOUSE - Random House, Inc., US

Data source: rdap (0.3s)

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 380 ms — DNS, TCP, TLS, TTFB, content transfer breakdown

PASS

DNS Lookup

20 ms

TCP Connect

87 ms

TLS Handshake

182 ms

Time to First Byte

380 ms

Total Time

380 ms

Connection waterfall

DNS Lookup 20 ms TCP Connect 87 ms TLS Handshake 182 ms Server Processing 91 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.