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Total

DNS

100

Email

Security

Network

100

Availability

Domainkb.nl

IPv41

IPv60

MX records1

StatusActive

Domain technical report

KB, nationale bibliotheek

kb.nl

Bekijk de digitale, gedrukte en geschreven erfgoedcollecties van Nederland: handschriften, catalogi, boeken, tijdschriften, kranten en kaarten.

Generated: 2026-08-11T00:17:29-05:00 · Cached result

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IPv41

IPv60

MX1

NS2

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

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

✓

SOA record10 / 10 pts · Dns

Authoritative zone record.

✓

DNSSEC chain15 / 15 pts · Dns

DS and DNSKEY detected.

✓

CAA policy5 / 5 pts · Dns

Certificate authority restriction.

✓

DNS propagation10 / 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

187 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)

195.169.50.5

AAAA

0 record(s)

—

Not configured

CNAME

0 record(s)

—

Not configured

MX

1 record(s)

10 kb-nl.mail.protection.outlook.com.

TXT

13 record(s)

"apple-domain-verification=aHqkSv6KAzbsYQna"
"QuoVadis=af202a47-b3c6-4628-9b0f-021cef4a4ef5"
"v=spf1 include:spf.protection.outlook.com include:_s39t9oahe.sdmarc.net -all  "
"hetrooster-verification=b6f5e03e542f4a23820d8b242ccbc8"
"atlassian-domain-verification=0ixi/KoDuTQnGXJ0AIUU3eRBX3GFkQsZFLOQWTJk1rlSZA45A57uLnEHbigNfxVN"
"DomainVerification=PFR8M4HS7CW5TE7KYU0B8WKT3R9SUMAACMPEKE0LPHX0YIFBZN4BXHARORI0A28N"
"1GzFT2Jfnuua/luf/S31idfrIAQDEMyHcWY3luTygtkM1QMHtFaR+8sbYGnJ/WYdLmLNmcSKASt6Tt+Lt1b+Qg=="
"d606c0bf-259a-4ab3-9482-f83d3b690e39-13052019"
"HARICA-ToTwT20DiduGpFzMtAN"
"autodesk-domain-verification=taEOZTMk0GLSnaLJSMpp"
"mindmanager-verification=9317824a5a58e32b3eaf2f44ebf0ebff06bc85a0aaa10f08c856cce347bc8ae2"
"MS=ms92408532"
"ms-domain-verification=d78f1f80-8f44-44e2-a2c1-f2ea09278ba2"

NS

2 record(s)

ns1.surfnet.nl.
ns1.zurich.surf.net.

SOA

1 record(s)

ns1-konbib.kb.nl. postmaster.kb.nl. 2015345730 10800 1080 2419200 900

CAA

2 record(s)

0 issue "sectigo.com"
0 issue "harica.gr"

DS

1 record(s)

13417 13 2 8DCD19BDF192CA31B3F2F96EE1FC729246346EBF5A1C098D6D744C88 6A5634B5

DNSKEY

4 record(s)

257 3 13 H98kNYKDVWeiz34UQNWICBt5rI1W3msT3V8pmYcSUhgvu5ATRfcitOMb AN+7CEfGajkPuJY9OXxI63S6HKiNQA==
257 3 13 l+hhav5+OZ9k9Lpjy5hul7nyzMSEdXTyeegketBkxqjd6UksnnwW+bPi mssL/NCGYYHSKSZFE17J2ftABbsPRQ==
256 3 13 ZgaWmLhLIrQNcRG2udIuqNbPffNWMawUme8vtXtCYB3jpiLZea+csiiZ DuxcHHEQROusXTeCFHeLaKf3SN24lA==
256 3 13 T46CsVSWeQjBa7xLd38AQAKXLdeC7rRjilmdjdm5fLY0/N/GGNvMxLl9 FMbHenFS6l7Fjg4tGEoqCbgYGQ1UBg==

RRSIG

3 record(s)

NS 13 2 3600 20260814211856 20260810211108 42632 kb.nl. plLmtHvAXMYxiFuy5bAlmEEAy3QEwaat8fPCznI8VUhwl52qpumeZm3W hN2iNE/h1o0TJu5495RM2Jj9YvHUtQ==
TXT 13 2 3600 20260814214329 20260810213340 42632 kb.nl. JU4jrU/zqDj4YklzqJmaS7BV4mHedUL5JMTk1lshragS2agW22YupKBT CQ3rw7rq7Xk0r9LcnC28in8AgqwTSw==
DS 13 2 3600 20260906034212 20260808204022 467 nl. wEhk4GLze5pZMjFaurIXSH4iwgPcEPj6zKu7EW8Mte4d4ZukShIHhG+j 8MwGFZl/410yqUb/v3DINMUbGMo0Fw==

NSEC

1 record(s)

57802104.kb.nl. A NS SOA MX TXT RRSIG NSEC DNSKEY CAA

NSEC3

0 record(s)

—

Not configured

SRV

0 record(s)

—

Not configured

NAPTR

0 record(s)

—

Not configured

TLSA

0 record(s)

—

Not configured

SSHFP

0 record(s)

—

Not configured

SPF

Configured

v=spf1 include:spf.protection.outlook.com include:_s39t9oahe.sdmarc.net -all

DMARC

Configured

v=DMARC1; p=none; pct=100; rua=mailto:a.39t9oahe@sdmarc.net

DKIM

Selector selector1

v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCj17C2ceAmH9bDA+W2vEAqbiV7ZMlABwMRHz8AsQikLrOtNXlTPT2ckVDlZfDCd/9anKv6079xuy3SL/jM3K2eMm/FJKNI4nmmerAD/0XKvRgPELzqHrRoPvldMcv+8CiPi2uIcQKWo+byklC+wnqmzT0MNkD4JdZdqB+BH/6X9QIDAQAB;

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

KB, nationale bibliotheek

Description

Bekijk de digitale, gedrukte en geschreven erfgoedcollecties van Nederland: handschriften, catalogi, boeken, tijdschriften, kranten en kaarten.

Final URL

https://www.kb.nl/

HTTP status

200

HTTP

Status

HTTP/2 200

Final URL

https://www.kb.nl/

Version

Server

cloudflare

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Hellenic Academic and Research Institutions CA

kb.nl

Valid from

2026-07-30T02:01:33-05:00

Valid until

2027-02-14T01:01:32-06:00

Days remaining

187

Protocol

TLSv1.3

Cipher

TLS_AES_128_GCM_SHA256

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

Consistent

✓

Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency

Google

8.8.8.8

195.169.50.5

51,76 ms

Cloudflare

1.1.1.1

195.169.50.5

301,04 ms

Quad9

9.9.9.9

195.169.50.5

152,88 ms

OpenDNS

208.67.222.222

195.169.50.5

251,21 ms

AdGuard

94.140.14.14

195.169.50.5

143,70 ms

IP, geolocation and ASNAssociated network information

195.169.50.5

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

kb-nl.mail.protection.outlook.com

Port 25: Closed/unreachable - 43.1 ms - 
Port 465: Closed/unreachable - 4062.5 ms - 
Port 587: Closed/unreachable - 4041.5 ms -

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