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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.oxfordlearnersdictionaries.com/
200https://oxfordlearnersdictionaries.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

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

Consistent

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

Certificate validity

289
days left
0d 30d 60d 90d+

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 Records
1 A records, 53 ms lookup
PASS
1 A records, 53 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 54.194.135.101
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-729.awsdns-27.net, ns-149.awsdns-18.com, ns-1029.awsdns-00.org, ns-1862.awsdns-40.co.uk
Info::
No MX records — email not configured via DNS
Info::
CAA records not checked
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Info::
No SPF record found in TXT records
SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.
Info::
DNS resolution time: 53 ms
Got: 53 ms
A54.194.135.101
AAAA—
CNAME—
NSns-729.awsdns-27.net, ns-149.awsdns-18.com, ns-1029.awsdns-00.org, ns-1862.awsdns-40.co.uk
MX—
TXT
_3obzdvk7kd4sk185vxp2wey5pljzi1p
b9vxqqs9rm48sdng29q8k85p8r9qgfhx
ktsdp83dl64qqhmvp1dqntw1p491pv73
CAALookup not available with standard resolver
Resolved in 53 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.

SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.

Why this matters

Without SPF, receiving servers can't validate sending IPs — your domain is easier to spoof in phishing.

Learn more ▾

SPF complements DMARC. Both should be published. SPF records list authorized sending IPs (e.g., `v=spf1 include:_spf.google.com ~all` for Google Workspace). After publishing, verify in Google Postmaster Tools or mxtoolbox.

Source: RFC 7208 (SPF)

A
Redirect Chain
1 redirect(s), 594 ms total
PASS
1 redirect(s), 594 ms total
Info::
Single redirect
Got: https://oxfordlearnersdictionaries.com → https://www.oxfordlearnersdictionaries.com/ (301)
Info::
WWW normalization redirect
Info::
Redirect overhead: 594 ms total
Got: 594 ms

https://oxfordlearnersdictionaries.com

113 ms · HTTP/1.1

301

https://www.oxfordlearnersdictionaries.c...

481 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://oxfordlearnersdictionaries.com301113 msHTTP/1.1nginx
2https://www.oxfordlearnersdictionaries.c...200481 msHTTP/1.1Apache

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 20 URLs
PASS
robots.txt present, sitemap with 20 URLs
Info::
robots.txt is present
Got: 7088 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 20 entries
Info::
Sitemap index with 20 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 7088 B Sitemaps referenced 3 User-agents anthropic-ai, CCBot, Claude-Web, *, ChatGPT-User, GPTBot, AmazonAdBot, Verity/1.1, SirdataBot Blocking No — crawling allowed






User-agent: anthropic-ai
User-agent: CCBot
User-agent: ChatGPT-User
User-agent: Claude-Web
User-agent: GPTBot
Disallow: /

User-agent: AmazonAdBot
Sitemap: https://www.oxfordlearnersdictionaries.com/sitemap.xml
Disallow: /info/
Disallow: /search/
Disallow: /autocomplete/
Disallow: /search
Disallow: /autocomplete
Disallow: /grammar/practical-english-usage/
Disallow: /spellcheck/practical-english-usage/
Disallow: /browse/practical-english-usage/
Disallow: /resources/practical-english-usage/
Disallow: /exercises/practical-english-usage/
Disallow: /translate/schulwoerterbuch_English-German/
Disallow: /spellcheck/schulwoerterbuch_English-German/
Disallow: /browse/schulwoerterbuch_English-German/
Disallow: /translate/schulwoerterbuch_German-English/
Disallow: /spellcheck/schulwoerterbuch_German-English/
Disallow: /browse/schulwoerterbuch_German-English/
Disallow: /resources/schulwoerterbuch/
Disallow: /exercises/schulwoerterbuch/
Disallow: /definition/academic/
Disallow: /spellcheck/academic/
Disallow: /browse/academic/
Disallow: /resources/academic/
Disallow: /exercises/academic/
Disallow: /definition/collocations/
Disallow: /spellcheck/collocations/
Disallow: /browse/collocations/
Disallow: /resources/collocations/
Disallow: /us/info/
Disallow: /us/search/
Disallow: /us/autocomplete/
Disallow: /us/search
Disallow: /us/autocomplete
Disallow: /us/grammar/practical-english-usage/
Disallow: /us/spellcheck/practical-english-usage/
Disallow: /us/browse/practical-english-usage/
Disallow: /us/resources/practical-english-usage/
Disallow: /us/exercises/practical-english-usage/
Disallow: /us/translate/schulwoerterbuch_English-German/
Disallow: /us/spellcheck/schulwoerterbuch_English-German/
Disallow: /us/browse/schulwoerterbuch_English-German/
Disallow: /us/translate/schulwoerterbuch_German-English/
Disallow: /us/spellcheck/schulwoerterbuch_German-English/
Disallow: /us/browse/schulwoerterbuch_German-English/
Disallow: /us/resources/schulwoerterbuch/
Disallow: /us/exercises/schulwoerterbuch/
Disallow: /us/definition/academic/
Disallow: /us/spellcheck/academic/
Disallow: /us/browse/academic/
Disallow: /us/resources/academic/
Disallow: /us/exercises/academic/
Disallow: /us/definition/collocations/
Disallow: /us/spellcheck/collocations/
Disallow: /us/browse/collocations/
Disallow: /us/resources/collocations/

User-agent: Verity/1.1
User-agent: SirdataBot
Crawl-delay: 3
Sitemap: https://www.oxfordlearnersdictionaries.com/sitemap.xml
Disallow: /info/
Disallow: /search/
Disallow: /autocomplete/
Disallow: /search
Disallow: /autocomplete
Disallow: /grammar/practical-english-usage/
Disallow: /spellcheck/practical-english-usage/
Disallow: /browse/practical-english-usage/
Disallow: /resources/practical-english-usage/
Disallow: /exercises/practical-english-usage/
Disallow: /translate/schulwoerterbuch_English-German/
Disallow: /spellcheck/schulwoerterbuch_English-German/
Disallow: /browse/schulwoerterbuch_English-German/
Disallow: /translate/schulwoerterbuch_German-English/
Disallow: /spellcheck/schulwoerterbuch_German-English/
Disallow: /browse/schulwoerterbuch_German-English/
Disallow: /resources/schulwoerterbuch/
Disallow: /exercises/schulwoerterbuch/
Disallow: /definition/academic/
Disallow: /spellcheck/academic/
Disallow: /browse/academic/
Disallow: /resources/academic/
Disallow: /exercises/academic/
Disallow: /definition/collocations/
Disallow: /spellcheck/collocations/
Disallow: /browse/collocations/
Disallow: /resources/collocations/
Disallow: /pronunciation/
Disallow: /spellcheck/
Disallow: /spellcheck
Disallow: /us/info/
Disallow: /us/search/
Disallow: /us/autocomplete/
Disallow: /us/search
Disallow: /us/autocomplete
Disallow: /us/grammar/practical-english-usage/
Disallow: /us/spellcheck/practical-english-usage/
Disallow: /us/browse/practical-english-usage/
Disallow: /us/resources/practical-english-usage/
Disallow: /us/exercises/practical-english-usage/
Disallow: /us/translate/schulwoerterbuch_English-German/
Disallow: /us/spellcheck/schulwoerterbuch_English-German/
Disallow: /us/browse/schulwoerterbuch_English-German/
Disallow: /us/translate/schulwoerterbuch_German-English/
Disallow: /us/spellcheck/schulwoerterbuch_German-English/
Disallow: /us/browse/schulwoerterbuch_German-English/
Disallow: /us/resources/schulwoerterbuch/
Disallow: /us/exercises/schulwoerterbuch/
Disallow: /us/definition/academic/
Disallow: /us/spellcheck/academic/
Disallow: /us/browse/academic/
Disallow: /us/resources/academic/
Disallow: /us/exercises/academic/
Disallow: /us/definition/collocations/
Disallow: /us/spellcheck/collocations/
Disallow: /us/browse/collocations/
Disallow: /us/resources/collocations/
Disallow: /us/pronunciation/
Disallow: /us/spellcheck/
Disallow: /us/spellcheck

User-agent: *
Sitemap: https://www.oxfordlearnersdictionaries.com/sitemap.xml
Disallow: /info/
Disallow: /search/
Disallow: /autocomplete/
Disallow: /search
Disallow: /autocomplete
Disallow: /grammar/practical-english-usage/
Disallow: /spellcheck/practical-english-usage/
Disallow: /browse/practical-english-usage/
Disallow: /resources/practical-english-usage/
Disallow: /exercises/practical-english-usage/
Disallow: /translate/schulwoerterbuch_English-German/
Disallow: /spellcheck/schulwoerterbuch_English-German/
Disallow: /browse/schulwoerterbuch_English-German/
Disallow: /translate/schulwoerterbuch_German-English/
Disallow: /spellcheck/schulwoerterbuch_German-English/
Disallow: /browse/schulwoerterbuch_German-English/
Disallow: /resources/schulwoerterbuch/
Disallow: /exercises/schulwoerterbuch/
Disallow: /definition/academic/
Disallow: /spellcheck/academic/
Disallow: /browse/academic/
Disallow: /resources/academic/
Disallow: /exercises/academic/
Disallow: /definition/collocations/
Disallow: /spellcheck/collocations/
Disallow: /browse/collocations/
Disallow: /resources/collocations/
Disallow: /pronunciation/
Disallow: /spellcheck/
Disallow: /spellcheck
Disallow: /us/info/
Disallow: /us/search/
Disallow: /us/autocomplete/
Disallow: /us/search
Disallow: /us/autocomplete
Disallow: /us/grammar/practical-english-usage/
Disallow: /us/spellcheck/practical-english-usage/
Disallow: /us/browse/practical-english-usage/
Disallow: /us/resources/practical-english-usage/
Disallow: /us/exercises/practical-english-usage/
Disallow: /us/translate/schulwoerterbuch_English-German/
Disallow: /us/spellcheck/schulwoerterbuch_English-German/
Disallow: /us/browse/schulwoerterbuch_English-German/
Disallow: /us/translate/schulwoerterbuch_German-English/
Disallow: /us/spellcheck/schulwoerterbuch_German-English/
Disallow: /us/browse/schulwoerterbuch_German-English/
Disallow: /us/resources/schulwoerterbuch/
Disallow: /us/exercises/schulwoerterbuch/
Disallow: /us/definition/academic/
Disallow: /us/spellcheck/academic/
Disallow: /us/browse/academic/
Disallow: /us/resources/academic/
Disallow: /us/exercises/academic/
Disallow: /us/definition/collocations/
Disallow: /us/spellcheck/collocations/
Disallow: /us/browse/collocations/
Disallow: /us/resources/collocations/
Disallow: /us/pronunciation/
Disallow: /us/spellcheck/
Disallow: /us/spellcheck
sitemap.xml 200 OK
Type Sitemap Index URLs 20 entries Valid XML Yes
Child Sitemaps:
A
Domain Intelligence
oxfordlearnersdictionaries.com — via CSC Corporate Domains, Inc., 15 years old, hosted on AWS
PASS
oxfordlearnersdictionaries.com — via CSC Corporate Domains, Inc., 15 years old, hosted on AWS
Warning::
Domain expires in 67 days
Consider enabling auto-renewal to prevent accidental expiration.
Got: Expires Jun 29, 2026
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: 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: AWS
Got: AS16509
Domain expiry

14 days

June 29, 2026

SSL certificate

289 days

Issued by DigiCert Inc

Domain age

15 years

Registered June 29, 2011

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

AWS

ASN AS16509

54.194.135.101

Registrar

CSC Corporate Domains, Inc.

Unlocked 4 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Renew the domain or enable auto-renewal to prevent accidental expiry
  • Enable DNSSEC to protect visitors from DNS spoofing
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar CSC Corporate Domains, Inc.
Created June 29, 2011 (15 years ago)
Expires June 29, 2026 (2 months)
Last Updated June 25, 2025
Name Servers ns-1029.awsdns-00.org, ns-149.awsdns-18.com, ns-1862.awsdns-40.co.uk, ns-729.awsdns-27.net
DNSSEC Not enabled
Hosting
IP Address 54.194.135.101
ASN AS16509 (AMAZON-02 - Amazon.com, Inc., US)
Provider AWS
Data source: rdap (0.3s)

Consider enabling auto-renewal to prevent accidental expiration.

Why this matters

Domain expiry approaching — renew immediately and ensure auto-renew + alerting are configured.

Source: ICANN renewal policy

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

Connection waterfall

DNS Lookup 55 ms TCP Connect 35 ms TLS Handshake 37 ms Server Processing 35 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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