Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.DCDN & DeliveryActionNo CDN detectedFIX
Consider using a CDN to improve global delivery speed and reduce origin load.
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 & Recommendations181 days until leaf cert expires — 3 issues to addressREVIEW
Certificate validity
Recommended actions
- Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
- 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, 122 ms lookupPASS
| A | 192.149.119.104 |
| AAAA | — |
| CNAME | — |
| NS | tori.ns.cloudflare.com, cory.ns.cloudflare.com |
| MX | 10 eu-smtp-inbound-2.mimecast.com 10 eu-smtp-inbound-1.mimecast.com |
| TXT | knowbe4-site-verification=6f2a12971b44215b655214e401300716 include:5924315.spf03.hubspotemail.net 9p802vvl7h8b2m0fkxnj6yr63lbzmpcy google-site-verification=5cirDNRZazGUoWTZPujAoy-fgAojJ6amufYEbzI1v3o MS=ms19841478 ll166xs8ws4zhzlwhq5v1gy493v6r61x miro-verification=e0eb88c47512f1b3e347014c28cd69d732b8cc38 google-site-verification=OZR0vtaIVx-CXbBpgK6pNHf5PTwVVdDJinwbgyji9IE SPF v=spf1 a mx include:cmail1.com include:eu._netblocks.mimecast.com include:amazon... atlassian-domain-verification=7S7bsIrOwlHLdBG0OLNWITmcgqmnW8uaUKxRjA4McIJx1ThN46... _abhims0zjvdxqbzi2j255c7cvowv0zr _d2xhnk6y7vlcw9pgwg6b4v2cg5nyu63 onetrust-domain-verification=2654fafedb024cecb9e41b930ed9a18f have-i-been-pwned-verification=a6201645bc8edb442641932f8103ba98 formstack-domain-verification=bc1d27a650a1f333058871330e43d4c1 _8w0qdp5nmgfa3lyhllk2rocgvdz942f facebook-domain-verification=trgfd7e89lg85a3t23kzhoatfvopg6 figma-domain-verification=82306f7d5e6d9b44f70bf7e951c99627e467dcb0111c988d3ae206... google-site-verification=vq1QWXgfng_zzsvf9t6hKBs-0DX49bZ4SSz_fqzGE3w MS=ms13342247 docusign=4595e243-701e-4362-9936-d85d82391a0a Bgoo8idsklqDjUjvYHfOQQYmalglvaKKNpNt/hSBXBVea/VIQ61a4Nr4wFhQv5+8O2DBqDYy2S0O9LPY... have-i-been-pwned-verification=9a5a28dae576789bd8bfcad293b94ba0 ljyy2s3qsq231y72gr3jxy00f0dwqksp onetrust-domain-verification=254c817a41ad4bfd922aa2afac6db336 |
| 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), 239 ms totalPASS
https://cambridgeenglish.org
100 ms · HTTP/1.0
https://www.cambridgeenglish.org/
139 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://cambridgeenglish.org | 301 | 100 ms | HTTP/1.0 | BigIP |
| 2 | https://www.cambridgeenglish.org/ | 200 | 139 ms | HTTP/1.1 | Microsoft-IIS/10.0 |
See the visual redirect chain in the HTTP Probe tab →
A+Crawlabilityrobots.txt present, sitemap with 5179 URLsPASS
User-agent: *
Allow: /
Sitemap: https://www.cambridgeenglish.org/sitemap_seo.xml
disallow: /Images/683190-uk-2022-23-fee-sheet.pdf
A+Domain Intelligencecambridgeenglish.org — via IP Twins SAS, 17 years, 5 months old, hosted on UCLES-AS, GBPASS
222 days
January 23, 2027
181 days
Issued by DigiCert Inc
17 years, 5 months
Registered January 23, 2009
Not enabled
Protects against DNS spoofing
UCLES-AS, GB
ASN AS198032
192.149.119.104
IP Twins SAS
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