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https://le.ac.uk

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
90
GRADE
A
FIX
1
REVIEW
4
PASS
4
INFO
0
Probed from Sao Paulo, Brazil
200 OK
Checks
9
4 PASS 4 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.

B
DNS Records
1 A records, 1099 ms lookup
REVIEW
1 A records, 1099 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 143.210.133.109
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: ns0.le.ac.uk, ns1.le.ac.uk, ns2.le.ac.uk, ns3.ja.net
Info::
1 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::
No SPF record found in TXT records
SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.
Warning::
DNS resolution is slow (1099 ms)
Slow DNS adds latency to every page load. Consider a faster DNS provider.
Got: 1099 ms
A143.210.133.109
AAAA—
CNAME—
NSns0.le.ac.uk, ns1.le.ac.uk, ns2.le.ac.uk, ns3.ja.net
MX
4 le-ac-uk.mail.protection.outlook.com
TXT
MS=ms36016575
QuoVadis=04feb944-b731-4e85-8615-c40fe6d3ed09
google-site-verification=dGb2np2GLuolzmaII-_AClVSayvQU3HkNdKH_UvHqzY
have-i-been-pwned-verification=5c9eb1c48ff05a56ec3ed4c36478cf60vHqzY
yhsCBgk9WhApk3ZLiA78+B2V/Qy6E2QqY4rNlVs30X5ADle1LiZCPcDOz0SV4CaogCto8sIZcs8fONT1...
CAALookup not available with standard resolver
Resolved in 1099 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)

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

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

C
HTTP Probe Timing
Action
Total 1987 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
REVIEW
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
735 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
183 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
372 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
1.62 s
Total Time Total request time from DNS lookup through full response.
1.99 s

Connection waterfall

DNS Lookup 735 ms TCP Connect 183 ms TLS Handshake 372 ms Server Processing 330 ms Content Transfer 367 ms
B
TLS Certificate Expiry & Recommendations
63 days until leaf cert expires — 5 issues to address
REVIEW

Certificate validity

63
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
  • 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+
Redirect Chain
No redirects — direct access
PASS
No redirects — direct access
Info::
No redirects — direct access
Got: https://le.ac.uk

https://le.ac.uk

1597 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://le.ac.uk2001597 msHTTP/1.1WebServer
A+
Crawlability
robots.txt present, sitemap with 6221 URLs
PASS
robots.txt present, sitemap with 6221 URLs
Info::
robots.txt is present
Got: 264 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 6221 entries
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 264 B Sitemaps referenced 1 User-agents barkrowler, PetalBot, * Blocking No — crawling allowed
# https://babbar.tech/crawler
User-agent: barkrowler
Disallow: /

# https://webmaster.petalsearch.com/site/petalbot
User-agent: PetalBot
Disallow: /

User-agent: *
Disallow: /tagmanagertest
Disallow: /regression-testing-area

Sitemap: https://le.ac.uk/website.xml
sitemap.xml 200 OK
Type URL Set URLs 6221 entries Valid XML Yes
Sample URLs:
A+
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
PASS
www/non-www, trailing slash, HTTP→HTTPS
Info::
www/non-www redirect configured correctly (preferred: non-www)
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

301https://www.le.ac.uk/
200https://le.ac.uk/

Preferred variant: non-www

HTTP → HTTPS

301http://le.ac.uk/ → https://le.ac.uk/

Consistent

A+
Domain Intelligence
le.ac.uk — via No registrar listed. This domain is directly registered with Nominet., hosted on JANET Jisc Services Limited, GB
PASS
le.ac.uk — via No registrar listed. This domain is directly registered with Nominet., hosted on JANET Jisc Services Limited, GB
Info::
Registrar: No registrar listed. This domain is directly registered with Nominet.
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: JANET Jisc Services Limited, GB
Got: AS786
Domain expiry

Unknown

SSL certificate

63 days

Issued by Let's Encrypt

Domain age

Unknown

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

JANET Jisc Services Limited, GB

ASN AS786

143.210.133.109

Registrar

No registrar listed. This domain is directly registered with Nominet.

Unlocked 7 NS records
Expiry timeline
Today
+1 year
SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar No registrar listed. This domain is directly registered with Nominet.
Name Servers ns0.ja.net, ns2.ja.net, ns3.ja.net, ns4.ja.net, auth03.ns.uu.net, ns1.surfnet.nl, dns-3.dfn.de
Registrant The JNT Association
Hosting
IP Address 143.210.133.109
ASN AS786 (JANET Jisc Services Limited, GB)
Provider JANET Jisc Services Limited, GB
Data source: whois (2.5s)

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

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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