Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.CIPv6 ReadinessActionNo IPv6 supportREVIEW
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.
Source: Google IPv6 stats
BURL Variantswww/non-www, trailing slash, HTTP→HTTPSREVIEW
www / non-www
Inconsistent — duplicate content risk
HTTP → HTTPS
Consistent
BTLS Certificate Expiry & Recommendations229 days until leaf cert expires — 5 issues to addressREVIEW
Certificate validity
Recommended actions
- Extend HSTS max-age to at least 31536000 (1 year) to meet the preload list criteria
- Add includeSubDomains to the HSTS directive
- Add the preload directive and submit to hstspreload.org once max-age + includeSubDomains are in place
- 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
A+DNS Records1 A records, 51 ms lookupPASS
| A | 23.227.38.65 |
| AAAA | — |
| CNAME | — |
| NS | dmtu.mt.ns.els-gms.att.net, dbru.br.ns.els-gms.att.net |
| MX | 5 mxb-00596a01.gslb.pphosted.com 5 mxa-00596a01.gslb.pphosted.com |
| TXT | nmmBU9m0JKlQMzYMFSA/7LacnfwY0LsGTpiMcOsFM0jILtamuI3jvV2g3+O7KKOWO4rFfGHDmZWIO4IR... dropbox-domain-verification=ucbh5javnke3 google-site-verification=tyaXIKYYcxrtquGnQyTPzzqgJzO-f3JTYTofj1Pzg8c adobe-idp-site-verification=42f51b67c9248bf4af00579848be3b6b4165111f7e95fa138083... /eU+eq5f7XbZNa8X8rWAWZCAxYOy7z4IYhIT2Hp05EahhGMbex3/zdcOQDwWN6QGJr6ECqI6hdg1Tqpr... webexdomainverification.4C675B8AE253B136E053AB06FC0A3F65=af0d073d-91d2-47fb-afa5... dbc36a8f57004cec8e50382190a4c767 adobe-sign-verification=f95381908feb7fd54d511615905bee51 knowbe4-site-verification=0694ce74005828dc4bb8b7299bfb6f61 ahrefs-site-verification_73874523a8c99a90479647cc3a4099da8bdd565a9b576542cdf7518... bugcrowd-verification=a5b82af72ff73e6f057526a8c6946c80 atlassian-domain-verification=uNoIhBXurxzVlQa0FvK2t9Yld5byfvXbFRQaMToGvrieKjBdyl... _globalsign-domain-verification=bkER3fxZbQLIEl16wZS08EnQpoEG9UQBKihu8Ks2Zd ZOOM_verify_c8YbePuKRTOlYTGf_XKe2Q ca3-55817d6452e54bb686ad84dded8965e2 asv=6bcb95b6501de3efbcb4bba9870aa071 docker-verification=dfcc680b-f409-45d1-b9a7-7992e21b9a52 SPF v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com ~all google-site-verification=mrNi0RTTBHQ_NPHcDoUYnii2GYVeN8gg0XIYRMJmoU0 google-site-verification=nmk1hXTEYrIjhNQa3heeK1KiHKtzpXxB1jDCZP7e8o0 ValidationTokenValue=90fe4eb0-f1cb-4e32-a847-dc0e99fd6213 docusign=725b7e74-15db-4d54-ac76-889b6f206549 figma-domain-verification=950abdf37a7ff2b00c3954b0b7c5b529439c5bc172d9955316215e... yahoo-verification-key=i+M9oi9b5+XYPU48wdxWhYtTSJpnVouSnI3IUqZq88I= extensis-domain-verification=fb808a86-2bd8-4609-b6da-ee938a0b5625 doordash-verification=N8fQ7KYWS5swsnXabGRKOjeGIighbm srjf85faf1ivlj2abkt967tdfd shopify-verification-code=nZBi4zupnooVrmOOmRl9un6F5ZYuq9 gc-ai-domain-verification-ctbrt8=XloEYpi5FPEXK53iCdLQtkSRU openai-domain-verification=dv-0nFS3ectycyfVyRNeTWKRZz3 figma-domain-verification=2f62cdb936c6fe21e979b91c99c54d82fb999e849a36aa4b2c5d05... google-site-verification=jBGiywYAcKUeCPqNZsGSvr_C6RMCPh0Z9g73o-1sBVI |
| 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
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.
ARedirect Chain1 redirect(s), 268 ms totalPASS
https://harpercollins.com
191 ms · HTTP/1.1
https://www.harpercollins.com/
77 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://harpercollins.com | 301 | 191 ms | HTTP/1.1 | cloudflare |
| 2 | https://www.harpercollins.com/ | 200 | 77 ms | HTTP/1.1 | cloudflare |
See the visual redirect chain in the HTTP Probe tab →
A+Crawlabilityrobots.txt present, sitemap with 66 URLsPASS
# we use Shopify as our ecommerce platform
# ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
# ┃ Robots & Agent policy ┃
# ┣━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┫
# ┃ Checkouts are for humans. ┃
# ┃ * Automated scraping, “buy-for-me” agents, or any end-to-end flow ┃
# ┃ that completes payment without a final human review step is not ┃
# ┃ permitted. ┃
# ┃ * Legitimate integrators must use the official Checkout Kit: ┃
# ┃ https://www.shopify.com/checkout-kit ┃
# ┃ ┃
# ┃ Terms of Service: https://www.shopify.com/legal/terms ┃
# ┃ Contact: bots@shopify.com ┃
# ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
User-agent: *
Disallow: /a/downloads/-/*
Disallow: /admin
Disallow: /cart
Disallow: /orders
Disallow: /checkouts/
Disallow: /checkout
Disallow: /28528214050/checkouts
Disallow: /28528214050/orders
Disallow: /carts
Disallow: /account
Disallow: /collections/*sort_by*
Disallow: /*/collections/*sort_by*
Disallow: /collections/*+*
Disallow: /collections/*%2B*
Disallow: /collections/*%2b*
Disallow: /*/collections/*+*
Disallow: /*/collections/*%2B*
Disallow: /*/collections/*%2b*
Disallow: */collections/*filter*&*filter*
Disallow: /blogs/*+*
Disallow: /blogs/*%2B*
Disallow: /blogs/*%2b*
Disallow: /*/blogs/*+*
Disallow: /*/blogs/*%2B*
Disallow: /*/blogs/*%2b*
Disallow: /*?*oseid=*
Disallow: /*preview_theme_id*
Disallow: /*preview_script_id*
Disallow: /policies/
Disallow: /*/policies/
Disallow: /*/*?*ls=*&ls=*
Disallow: /*/*?*ls%3D*%3Fls%3D*
Disallow: /*/*?*ls%3d*%3fls%3d*
Disallow: /search
Disallow: /sf_private_access_tokens
Disallow: /apple-app-site-association
Disallow: /.well-known/shopify/monorail
Disallow: /cdn/wpm/*.js
Disallow: /recommendations/products
Disallow: /*/recommendations/products
Disallow: /products/*-[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-remote
Disallow: /*/products/*-[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-remote
Disallow: /collections/*/products/*-[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-remote
Disallow: /*/collections/*/products/*-[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-remote
Sitemap: https://www.harpercollins.com/sitemap.xml
# Google adsbot ignores robots.txt unless specifically named!
User-agent: adsbot-google
Disallow: /checkouts/
Disallow: /checkout
Disallow: /carts
Disallow: /orders
Disallow: /28528214050/checkouts
Disallow: /28528214050/orders
Disallow: /*?*oseid=*
Disallow: /*preview_theme_id*
Disallow: /*preview_script_id*
Disallow: /cdn/wpm/*.js
Disallow: /products/*-[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-remote
Disallow: /*/products/*-[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-remote
Disallow: /collections/*/products/*-[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-remote
Disallow: /*/collections/*/products/*-[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-remote
Disallow: /sf_private_access_tokens
User-agent: Nutch
Disallow: /
User-agent: AhrefsBot
Crawl-delay: 10
Disallow: /a/downloads/-/*
Disallow: /admin
Disallow: /cart
Disallow: /orders
Disallow: /checkouts/
Disallow: /checkout
Disallow: /28528214050/checkouts
Disallow: /28528214050/orders
Disallow: /carts
Disallow: /account
Disallow: /collections/*sort_by*
Disallow: /*/collections/*sort_by*
Disallow: /collections/*+*
Disallow: /collections/*%2B*
Disallow: /collections/*%2b*
Disallow: /*/collections/*+*
Disallow: /*/collections/*%2B*
Disallow: /*/collections/*%2b*
Disallow: */collections/*filter*&*filter*
Disallow: /blogs/*+*
Disallow: /blogs/*%2B*
Disallow: /blogs/*%2b*
Disallow: /*/blogs/*+*
Disallow: /*/blogs/*%2B*
Disallow: /*/blogs/*%2b*
Disallow: /*?*oseid=*
Disallow: /*preview_theme_id*
Disallow: /*preview_script_id*
Disallow: /policies/
Disallow: /*/policies/
Disallow: /*/*?*ls=*&ls=*
Disallow: /*/*?*ls%3D*%3Fls%3D*
Disallow: /*/*?*ls%3d*%3fls%3d*
Disallow: /search
Disallow: /sf_private_access_tokens
Disallow: /apple-app-site-association
Disallow: /.well-known/shopify/monorail
Disallow: /cdn/wpm/*.js
Disallow: /recommendations/products
Disallow: /*/recommendations/products
Disallow: /products/*-[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-remote
Disallow: /*/products/*-[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-remote
Disallow: /collections/*/products/*-[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-remote
Disallow: /*/collections/*/products/*-[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-remote
Sitemap: https://www.harpercollins.com/sitemap.xml
User-agent: AhrefsSiteAudit
Crawl-delay: 10
Disallow: /a/downloads/-/*
Disallow: /admin
Disallow: /cart
Disallow: /orders
Disallow: /checkouts/
Disallow: /checkout
Disallow: /28528214050/checkouts
Disallow: /28528214050/orders
Disallow: /carts
Disallow: /account
Disallow: /collections/*sort_by*
Disallow: /*/collections/*sort_by*
Disallow: /collections/*+*
Disallow: /collections/*%2B*
Disallow: /collections/*%2b*
Disallow: /*/collections/*+*
Disallow: /*/collections/*%2B*
Disallow: /*/collections/*%2b*
Disallow: */collections/*filter*&*filter*
Disallow: /blogs/*+*
Disallow: /blogs/*%2B*
Disallow: /blogs/*%2b*
Disallow: /*/blogs/*+*
Disallow: /*/blogs/*%2B*
Disallow: /*/blogs/*%2b*
Disallow: /*?*oseid=*
Disallow: /*preview_theme_id*
Disallow: /*preview_script_id*
Disallow: /policies/
Disallow: /*/policies/
Disallow: /*/*?*ls=*&ls=*
Disallow: /*/*?*ls%3D*%3Fls%3D*
Disallow: /*/*?*ls%3d*%3fls%3d*
Disallow: /search
Disallow: /sf_private_access_tokens
Disallow: /apple-app-site-association
Disallow: /.well-known/shopify/monorail
Disallow: /cdn/wpm/*.js
Disallow: /recommendations/products
Disallow: /*/recommendations/products
Disallow: /products/*-[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-remote
Disallow: /*/products/*-[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-remote
Disallow: /collections/*/products/*-[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-remote
Disallow: /*/collections/*/products/*-[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-remote
Sitemap: https://www.harpercollins.com/sitemap.xml
User-agent: MJ12bot
Crawl-delay: 10
User-agent: Pinterest
Crawl-delay: 1
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pr...
- https://www.harpercollins.com/sitemap_pa...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_co...
- https://www.harpercollins.com/sitemap_bl...
- https://www.harpercollins.com/sitemap_bl...
- https://www.harpercollins.com/sitemap_bl...
- https://www.harpercollins.com/sitemap_bl...
- https://www.harpercollins.com/sitemap_bl...
- https://www.harpercollins.com/sitemap_bl...
- https://www.harpercollins.com/sitemap_bl...
- https://www.harpercollins.com/sitemap_bl...
- https://www.harpercollins.com/sitemap_bl...
- https://www.harpercollins.com/sitemap_bl...
- https://www.harpercollins.com/sitemap_bl...
A+Domain Intelligenceharpercollins.com — via MarkMonitor Inc., 32 years, 5 months old, hosted on CloudflarePASS
269 days
April 14, 2027
229 days
Issued by DigiCert Inc
32 years, 5 months
Registered April 13, 1994
Not enabled
Protects against DNS spoofing
Cloudflare
ASN AS13335
23.227.38.65
MarkMonitor Inc.
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