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Total

DNS

100

Email

Security

Network

100

Availability

Domainbl.uk

IPv41

IPv60

MX records1

StatusActive

Domain technical report

The British Library - the national Library of the UK

bl.uk

Visit the national library of the UK. Explore our buildings, study, meet friends, attend an event and get free access to over 170 million items. Join us.

Generated: 2026-08-08T23:59:40-05:00 · Cached result

JSON CSV PDF Visit site

IPv41

IPv60

MX1

NS4

DiagnosticsMain findings and recommendations

✓

IPv4 (A)30 / 30 pts · Dns

1 IPv4 address(es) detected.

IPv6 (AAAA)0 / 10 pts · Dns

0 IPv6 address(es) detected.

✓

Name server redundancy20 / 20 pts · Dns

4 NS record(s); 2 or more required.

✓

SOA record10 / 10 pts · Dns

Authoritative zone record.

DNSSEC chain0 / 15 pts · Dns

Both DS and DNSKEY are required.

CAA policy0 / 5 pts · Dns

Certificate authority restriction.

DNS propagation0 / 10 pts · Dns

Agreement between public resolvers.

✓

MX records20 / 20 pts · Mail

1 MX record(s).

✓

SPF25 / 25 pts · Mail

SPF policy published.

✓

DMARC25 / 25 pts · Mail

DMARC policy published.

✓

DKIM20 / 20 pts · Mail

A DKIM selector was verified.

✓

MTA-STS5 / 5 pts · Mail

Mail transport policy.

✓

TLS-RPT5 / 5 pts · Mail

TLS reporting policy.

✓

Valid TLS certificate55 / 55 pts · Security

180 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers23 / 35 pts · Security

6 of 9 evaluated headers detected.

PTR reverse DNS0 / 30 pts · Network

PTR not detected.

IPv4 diversity20 / 35 pts · Network

Two or more IPv4 addresses receive full points.

IPv6 connectivity0 / 35 pts · Network

AAAA availability.

✓

DNS resolution40 / 40 pts · Availability

At least one address family must resolve.

✓

HTTP response40 / 40 pts · Availability

HTTP/2 200

✓

HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

1 record(s)

150.171.110.211

AAAA

0 record(s)

—

Not configured

CNAME

0 record(s)

—

Not configured

MX

1 record(s)

0 bl-uk.mail.protection.outlook.com.

TXT

9 record(s)

"FA5T2HNd4Z2t9S7ux41mfP8JGJTkoeWFS9V/xmfpi8k8sGu1v/Umw1gJ9AH/7jp9Mi8K+uzP+1RXl4y2CE4UWQ=="
"v=spf1 ip4:193.60.208.0/21 ip4:194.66.224.0/20 ip4:132.145.15.90 ip4:216.154.234.17 ip4:216.154.234.20 ip4:80.69.7.251 ip4:216.47.169.220 ip4:213.215.157.240 ip4:65.196.76.100/31 ip4:87.82.49.47 ip4:130.88.200.0/24 ip4:185.71.184.242 ip4:51.140.99.252 ip4" ":51.140.100.9 ip4:51.140.87.218 ip4:51.140.78.20 ip4:51.132.245.31 ip4:51.132.243.191 ip4:161.12.104.159 ip4:161.12.103.69 include:spf-a.bl.uk include:spf.protection.outlook.com -all"
"adobe-idp-site-verification=520bfd7f15d8e5fcb141b804ed1ddc374011bc87649d89c00254cf6ffbd76a09"
"google-site-verification=iRys8j67fLBSgTxhC6Fcvt9OQczp0s793T30Yc9KxpY"
"_au59wvxcnh4akksi0n75mnz2roq48oc"
"99tf2wh8wxn0gzyl2mks6mqkgy2d2k6k"
"google-site-verification=KTY5PP0ek0D7JV7o3PFB6jSpEkJD51y5gh_izHPNKOQ"
"seal-subscriptions-verification=cd2oxlvew4afjec4jqqk"
"_zog2y0c21sozves01ej31k4umh18flu"

NS

4 record(s)

ns4-06.azure-dns.info.
ns2-06.azure-dns.net.
ns1-06.azure-dns.com.
ns3-06.azure-dns.org.

SOA

1 record(s)

ns1-06.azure-dns.com. azuredns-hostmaster.microsoft.com. 1 3600 300 2419200 300

CAA

0 record(s)

—

Not configured

DS

0 record(s)

—

Not configured

DNSKEY

0 record(s)

—

Not configured

RRSIG

0 record(s)

—

Not configured

NSEC

0 record(s)

—

Not configured

NSEC3

0 record(s)

—

Not configured

SRV

0 record(s)

—

Not configured

NAPTR

1 record(s)

100 10 "S" "x-eduroam:radius.tls" "" _radsec._tcp.roaming.ja.net.

TLSA

0 record(s)

—

Not configured

SSHFP

0 record(s)

—

Not configured

SPF

Configured

v=spf1 ip4:193.60.208.0/21 ip4:194.66.224.0/20 ip4:132.145.15.90 ip4:216.154.234.17 ip4:216.154.234.20 ip4:80.69.7.251 ip4:216.47.169.220 ip4:213.215.157.240 ip4:65.196.76.100/31 ip4:87.82.49.47 ip4:130.88.200.0/24 ip4:185.71.184.242 ip4:51.140.99.252 ip4:51.140.100.9 ip4:51.140.87.218 ip4:51.140.78.20 ip4:51.132.245.31 ip4:51.132.243.191 ip4:161.12.104.159 ip4:161.12.103.69 include:spf-a.bl.uk include:spf.protection.outlook.com -all

DMARC

Configured

v=DMARC1; p=quarantine; rua=mailto:Zx8RotHbwRo@dmarc-rua.mailcheck.service.ncsc.gov.uk;

DKIM

Selector selector1

v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDd3XM9ZOx+dmdJBd4dS3kKYPpOVYoJx1gx6ClVJPbMtj6lzEbQSP5u7F+h0LzFezhQBIGu+SzNT+i2+kfyq3C6+jB14fFH7MOwAIpWADmRQ77WKKXr9ctefXsoq0oZZm7KzsoPn/2sKPaGKtKbg3I2efdcvXifyEbXfus2UAVKIQIDAQAB; n=1024,1488628175,1504525775

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

The British Library - the national Library of the UK

Description

Visit the national library of the UK. Explore our buildings, study, meet friends, attend an event and get free access to over 170 million items. Join us.

Final URL

https://www.bl.uk/

HTTP status

200

HTTP

Status

HTTP/2 200

Final URL

https://www.bl.uk/

Version

Server

X-Powered-By

Next.js

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

DigiCert Inc

bl.uk

Valid from

2026-08-04T19:00:00-05:00

Valid until

2027-02-05T17:59:59-06:00

Days remaining

180

Protocol

TLSv1.3

Cipher

TLS_AES_256_GCM_SHA384

Security headers

6 active

✓

HSTSImplemented

✓

Content Security PolicyImplemented

✓

X-Content-Type-OptionsImplemented

✓

X-Frame-OptionsImplemented

✓

Referrer PolicyImplemented

✓

Permissions PolicyImplemented

—

Cross-Origin-Opener-PolicyNot detected

—

Cross-Origin-Embedder-PolicyNot detected

—

Cross-Origin-Resource-PolicyNot detected

DNS propagationComparison across public resolvers

Public resolver comparison

Review

Differences detected

5 public resolvers queried.

ResolverServerResultLatency

Google

8.8.8.8

150.171.110.210

76,31 ms

Cloudflare

1.1.1.1

150.171.110.210

55,20 ms

Quad9

9.9.9.9

150.171.110.177

80,97 ms

OpenDNS

208.67.222.222

150.171.109.178

42,94 ms

AdGuard

94.140.14.14

150.171.109.73

302,60 ms

IP, geolocation and ASNAssociated network information

150.171.110.211

No data

success

country

region

city

asn

organization

isp

Visitor information

Visitor

216.73.217.62

reverse

country

country_code

region

city

latitude

longitude

isp

organization

asn

timezone

browser

Other

language

user_agent

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

is_bot

Yes

cloudflare

SMTPEmail port connectivity

bl-uk.mail.protection.outlook.com

Port 25: Closed/unreachable - 21.2 ms - 
Port 465: Closed/unreachable - 4022.2 ms - 
Port 587: Closed/unreachable - 4019.3 ms -

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