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https://bl.uk

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
85
GRADE
B
FIX
0
REVIEW
4
PASS
5
INFO
0
Probed from Madrid, Spain
308 Permanent Redirect
Checks
9
5 PASS 4 REVIEW
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
URL Variants
Action
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
Warning::
HTTP→HTTPS redirect uses 302 instead of 301
Got: 302 temporary redirect Expected: 301 permanent redirect

www / non-www

200https://www.bl.uk/
200https://bl.uk/

Inconsistent — duplicate content risk

HTTP → HTTPS

307http://bl.uk/ → https://bl.uk/

Use 301 (permanent) instead of 302 (temporary)

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

Certificate validity

142
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
B
CDN & Delivery
Azure CDN (CONFIG_NOCACHE)
REVIEW
Azure CDN (CONFIG_NOCACHE)
Info::
Site is served via Azure CDN CDN
Got: x-azure-ref: 20260421T223216Z-15c79bf667f8hs29hC1PARkyr80000000ngg00000000dn7n
Info::
CDN cache status: CONFIG_NOCACHE
CDN Detected: Azure CDN
Provider Azure CDN Cache Status CONFIG_NOCACHE Evidence x-azure-ref: 20260421T223216Z-15c79bf667f8hs29hC1PARkyr80000000ngg00000000dn7n
A+
DNS Records
2 A records, 27 ms lookup
PASS
2 A records, 27 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 13.107.253.42, 13.107.226.42
Info::
No IPv6 (AAAA) records
Info::
4 nameserver(s) configured
Got: ns2-06.azure-dns.net, ns1-06.azure-dns.com, ns3-06.azure-dns.org, ns4-06.azure-dns.info
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
Info::
DNS resolution time: 27 ms
Got: 27 ms
A13.107.253.42, 13.107.226.42
AAAA—
CNAME—
NSns2-06.azure-dns.net, ns1-06.azure-dns.com, ns3-06.azure-dns.org, ns4-06.azure-dns.info
MX
0 bl-uk.mail.protection.outlook.com
TXT
adobe-idp-site-verification=520bfd7f15d8e5fcb141b804ed1ddc374011bc87649d89c00254...
google-site-verification=iRys8j67fLBSgTxhC6Fcvt9OQczp0s793T30Yc9KxpY
_au59wvxcnh4akksi0n75mnz2roq48oc
99tf2wh8wxn0gzyl2mks6mqkgy2d2k6k
FA5T2HNd4Z2t9S7ux41mfP8JGJTkoeWFS9V/xmfpi8k8sGu1v/Umw1gJ9AH/7jp9Mi8K+uzP+1RXl4y2...
seal-subscriptions-verification=cd2oxlvew4afjec4jqqk
_zog2y0c21sozves01ej31k4umh18flu
SPF v=spf1 ip4:193.60.208.0/21 ip4:194.66.224.0/20 ip4:132.145.15.90 ip4:216.154.234...
google-site-verification=KTY5PP0ek0D7JV7o3PFB6jSpEkJD51y5gh_izHPNKOQ
CAALookup not available with standard resolver
Resolved in 27 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.

A
Redirect Chain
1 redirect(s), 336 ms total
PASS
1 redirect(s), 336 ms total
Info::
Single redirect
Got: https://bl.uk → https://www.bl.uk/ (308)
Info::
WWW normalization redirect

https://bl.uk

82 ms · HTTP/1.1

308

https://www.bl.uk/

253 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://bl.uk30882 msHTTP/1.1
2https://www.bl.uk/200253 msHTTP/1.1

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 506 URLs
PASS
robots.txt present, sitemap with 506 URLs
Info::
robots.txt is present
Got: 63 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 506 entries
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 63 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
User-Agent: *
Allow: /

Sitemap: https://www.bl.uk/sitemap.xml
sitemap.xml 200 OK
Type URL Set URLs 506 entries Valid XML Yes
Sample URLs:
A+
Domain Intelligence
bl.uk — via No registrar listed. This domain is registered directly with Nominet., hosted on Microsoft Azure
PASS
bl.uk — via No registrar listed. This domain is registered directly with Nominet., hosted on Microsoft Azure
Info::
Domain registered until Nov 7, 2027 (1 years, 6 months remaining)
Info::
Registrar: No registrar listed. This domain is registered directly 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: Microsoft Azure
Got: AS8075
Domain expiry

509 days

November 7, 2027

SSL certificate

142 days

Issued by DigiCert Inc

Domain age

Unknown

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

Microsoft Azure

ASN AS8075

13.107.226.42

Registrar

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

Unlocked 4 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar No registrar listed. This domain is registered directly with Nominet.
Expires November 7, 2027 (1 years, 6 months)
Last Updated December 1, 2025
Name Servers ns1-06.azure-dns.com, ns2-06.azure-dns.net, ns3-06.azure-dns.org, ns4-06.azure-dns.info
Registrant The British Library
Hosting
IP Address 13.107.226.42
ASN AS8075 (MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US)
Provider Microsoft Azure
Data source: whois (0.7s)

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

Connection waterfall

DNS Lookup 31 ms TCP Connect 17 ms TLS Handshake 38 ms Server Processing 22 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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