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https://leeds.ac.uk

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
81
GRADE
B
FIX
1
REVIEW
4
PASS
4
INFO
0
Probed from Sao Paulo, Brazil
302 Found
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
Redirect Chain
1 redirect(s), 2109 ms total
REVIEW
1 redirect(s), 2109 ms total
Info::
Single redirect
Got: https://leeds.ac.uk → https://www.leeds.ac.uk/ (302)
Info::
WWW normalization redirect
Info::
Uses 302 (temporary) redirect
If permanent, use 301 instead.
Got: https://leeds.ac.uk
Warning::
Redirect overhead: 2109 ms total
Got: 2109 ms

https://leeds.ac.uk

789 ms · HTTP/1.1

302

https://www.leeds.ac.uk/

1320 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://leeds.ac.uk302789 msHTTP/1.1Web Server
2https://www.leeds.ac.uk/2001320 msHTTP/1.1Web Server

See the visual redirect chain in the HTTP Probe tab →

If permanent, use 301 instead.

Why this matters

302 (Found) is for genuinely temporary redirects — if this redirect is permanent, switch to 301 to preserve SEO equity.

Learn more ▾

Search engines treat 302 as temporary, keeping the original URL indexed and not transferring full link equity to the destination. Use 301 (Moved Permanently) for permanent redirects (HTTP→HTTPS, www-vs-non-www, URL restructures).

Source: Google Search Central

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.leeds.ac.uk/
200https://leeds.ac.uk/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://leeds.ac.uk/ → https://leeds.ac.uk:443/

Consistent

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

Certificate validity

281
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
2 A records, 1201 ms lookup
PASS
2 A records, 1201 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 3.33.141.243, 15.197.155.249
Info::
No IPv6 (AAAA) records
Info::
4 nameserver(s) configured
Got: dns.leeds.ac.uk, ns12.ja.net, ucsdns1.leeds.ac.uk, ucsdns2.leeds.ac.uk
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::
SPF record present in TXT
Warning::
DNS resolution is slow (1201 ms)
Slow DNS adds latency to every page load. Consider a faster DNS provider.
Got: 1201 ms
A3.33.141.243, 15.197.155.249
AAAA—
CNAME—
NSdns.leeds.ac.uk, ns12.ja.net, ucsdns1.leeds.ac.uk, ucsdns2.leeds.ac.uk
MX
0 uol.in.tmes.trendmicro.eu
TXT
d365mktkey=B3GPxfC7puhU84AxVlFvTaAoL85e4zxYXzv95EFhbsox
atlassian-domain-verification=9l4YorffoYbQAXi30qeeyK9nABMShCOaU0WqYv13WU/KLVdDQ9...
yi7inkpcssphqbunrgcsrv5kc44xszwi._domainkey.rescomms.leeds.ac.uk
tmes=3d7ed9c7f0822f2a261fe325fb1182b4
apple-domain-verification=OHOqmJHw1kOxLErw
DZC=PagXPRL
d365mktkey=4sql50yeu9cnn8jy52fwmp7e0
tmes=7dec6fa4ced73582138029de8265123d
tmes=ad3be6e5618c1e14e4d41bcddb66cec8
SPF v=spf1 ip4:194.82.12.4/32 ip4:172.166.14.167/32 ip4:20.49.212.144/28 ip4:20.77.1...
tmes=71e7324cdd1904f654d7446ff0bc0e7b
d365mktkey=JiKn3xEefZvBqfxb6r7PHCbpl75Ax632vK3Vxa7x1P0x
tmes=20478128d39695d944888e341904292e
d365mktkey=Xod65r4yx1p3bZYtWvx77rh8TwXxXOZ2Y3j2nWNxCdgx
QuoVadis=667ec68b-855c-4f5e-9dd7-3a42e65350d9
BD0C-605F-E67F-C2F0-3283-C2A9-63FC-CADA
9D77190F-18EA-4BA3-BB46-3623C32454DF
google-site-verification=02oJVjbWOYTIUy_HrU98JlkheQQ2zt-6wJ--_wsVN8Q
hcp-domain-verification=6292d17b816d22d21945c55a6f2093b98be91fd88b527f9e5c404a54...
QuoVadis=c95807fd-5441-4368-92f9-89f7d886406b
google-site-verification=pu1lR4CB8eBIkchN6OMOoS1gBDvMMtW1ZF7-ecXTdw8
ibmid=a3844846-f766-4dc2-b36d-b3a1ea622936
d365mktkey=H7oMz9BPJuptKAuxWp2y8cl8LDUpjlPMDM3T6Sk9Uzgx
d365mktkey=BtFCHP47aVxbCvqSxLg0M2eiCqXx3xoev4hpDhQA52sx
d365mktkey=KfPxUvuZocIV0oFM32mJgWc5bPVjJerIJs3YgJaMlscx
have-i-been-pwned-verification=bffd8f60dd6222676cdf3ee417db0c4c
facebook-domain-verification=03kt8kxw9kf6fpcmcfeak0d176236g
pardot295242=d6f9e2a8b7d60948b44e83bd8cfcd846c6d8d5d474db03955aa11c39254daa73
MS=ms61819594
iW4iUQkG7Ty2/YW35PpUiBJWmAiTwd6ZwqGDCotBwcLTBBjGNcVS+zviFmFB45sPdYK/g+zInG9wwEYA...
CAALookup not available with standard resolver
Resolved in 1201 ms

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.

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

A+
Crawlability
robots.txt present, sitemap with 4761 URLs
PASS
robots.txt present, sitemap with 4761 URLs
Info::
robots.txt is present
Got: 0 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 4761 entries
Info::
robots.txt does not reference a sitemap
Add a 'Sitemap:' directive to robots.txt so search engines can discover your 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 0 B Sitemaps referenced 0 User-agents Blocking No — crawling allowed
sitemap.xml 200 OK
Type URL Set URLs 4761 entries Valid XML Yes
Sample URLs:
A+
Domain Intelligence
leeds.ac.uk — via No registrar listed. This domain is directly registered with Nominet., hosted on AWS
PASS
leeds.ac.uk — via No registrar listed. This domain is directly registered with Nominet., hosted on AWS
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: AWS
Got: AS16509
Domain expiry

Unknown

SSL certificate

281 days

Issued by Amazon

Domain age

Unknown

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

AWS

ASN AS16509

15.197.155.249

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 15.197.155.249
ASN AS16509 (AMAZON-02 - Amazon.com, Inc., US)
Provider AWS
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

A
HTTP Probe Timing
Total 789 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
192 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
186 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
188 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
789 ms
Total Time Total request time from DNS lookup through full response.
789 ms

Connection waterfall

DNS Lookup 192 ms TCP Connect 186 ms TLS Handshake 188 ms Server Processing 223 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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