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Total

100

DNS

Email

Security

100

Network

Availability

Domainknaw.nl

IPv42

IPv62

MX records1

StatusActive

Domain technical report

knaw.nl

Welkom bij de Koninklijke Nederlandse Akademie van Wetenschappen

Generated: 2026-08-09T19:36:53-05:00 · Cached result

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IPv42

IPv62

MX1

NS4

DiagnosticsMain findings and recommendations

✓

IPv4 (A)30 / 30 pts · Dns

2 IPv4 address(es) detected.

✓

IPv6 (AAAA)10 / 10 pts · Dns

2 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 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-STS0 / 5 pts · Mail

Mail transport policy.

TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓

Valid TLS certificate55 / 55 pts · Security

123 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers0 / 35 pts · Security

0 of 9 evaluated headers detected.

✓

PTR reverse DNS30 / 30 pts · Network

PTR: a17f617dc3bf391dc.awsglobalaccelerator.com

✓

IPv4 diversity35 / 35 pts · Network

Two or more IPv4 addresses receive full points.

✓

IPv6 connectivity35 / 35 pts · Network

AAAA availability.

✓

DNS resolution40 / 40 pts · Availability

At least one address family must resolve.

HTTP response0 / 40 pts · Availability

HTTP/2 403

✓

HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

2 record(s)

99.83.229.36
75.2.96.239

AAAA

2 record(s)

2600:9000:a603:d4ab:3b46:6664:541:3b6c
2600:9000:a715:397e:a2c2:110b:23d8:9a4f

CNAME

0 record(s)

—

Not configured

MX

1 record(s)

0 knaw-nl.mail.protection.outlook.com.

TXT

12 record(s)

"mCkVvXn6dUZyrFXWsGknbJGIaEbjWNeL3Rg2I92MbXPcArPmEMCPNv15sm0x65tcpO+jrI5Lt1gUi9X1EySVOw=="
"apple-domain-verification=Kx3upsCHpUwCVztU"
"bw=PyPBZFeE2tQkoeBRxXYmeBuS3uLfkdcUswjyyL973iS6"
"google-site-verification=HfgEEpjNWwaecSYe8KnNATWfrzAExHVBlvTsuA7kGnk"
"HARICA-vvDQGK7pd3xxArhCoJD"
"adobe-idp-site-verification=e574ceb69375114ec72f4bc11ec46141ec4c1c194117b84d37a333c9a1375d04"
"atlassian-domain-verification=9CeGC9xO7peuiHdqk16OTwnXaYfFs3iy9LGVIXxD/OxiJfEJahXbqX7Q5jrUrqJ2"
"google-site-verification=94L39qL06lBH7le4wa74Yq2Me0ByOxWwLc7WdL8AA3s"
"v=spf1 include:spf.protection.outlook.com include:_spf.knaw.nl include:servers.mcsv.net ip4:5.39.185.32/29 ip4:185.181.140.187 ip4:87.253.234.71 ip4:87.253.234.73 ip4:87.253.234.85 include:spam1.htx.nl include:spf.mailjet.com include:_spf-dc55.sapsf.eu  i" "nclude:spf.topdesk.net -all"
"google-site-verification=PA5clm1yBwUuQdkN5N0q_7xjZWXFMLR8nB2gLkVtX-A"
"procurios-site-verification=gagUhW73NFSdoza3Vaj3"
"have-i-been-pwned-verification=b1fd016e7cf47b73cf71b12f8ed10003"

NS

4 record(s)

ns3.surfnet.nl.
ns1.surfnet.nl.
ns2.surfnet.nl.
ns1.zurich.surf.net.

SOA

1 record(s)

ns1.surfnet.nl. dns-beheer.surf.nl. 2026080602 10800 3600 604800 3600

CAA

5 record(s)

0 issue "letsencrypt.org"
0 issue "amazonaws.com"
0 issuewild "harica.gr"
0 issue "harica.gr"
0 iodef "mailto:knawnet@knaw.nl"

DS

1 record(s)

61177 13 2 60DBB9E2AC8D467BB6DABDB4A3E27EBEBEA7F95B43D4B59362AF143F A8240F33

DNSKEY

1 record(s)

257 3 13 7TrO2X2INbsCYV+tnGjJpoTkilUYo0jyXprwNn2RLjVMMSNzqBASh9oA pdEJZmZLFdMqeCqx6netIakUwvO/rw==

RRSIG

5 record(s)

DNSKEY 13 2 3600 20260820000000 20260730000000 61177 knaw.nl. KSg9vV+ozekVv4rEX0u/acNPwecUXQ1zRwNpQukdMdJjoX/rqpKq45a4 7yK4rhkvHek2VnH/8e5kVlZwD9eJcA==
TXT 13 2 3600 20260820000000 20260730000000 61177 knaw.nl. KpZfuyA5n3VmZrmT7bvPdAOKFonhYhmR0wTcTUXckaYv7+fb7AWIORXc Z90G9vbnYthIOcFQl2xXtol30ueSpA==
A 13 2 300 20260820000000 20260730000000 61177 knaw.nl. 0O5M7/ILXekdhby69csiYqffq9JQ8kyuVmjBUNKFCNleWIr6lWXX5E2P cXyC9SYFdIyz3/qW2o2KZo3zG/Lv6w==
DS 13 2 3600 20260901094505 20260804043802 467 nl. pLCol/E3m2zzyrjMCjAAWaRU6GVfmI9hq3SdxRDYXTTiK7EoTOSqUBag mRxHj5VLfg3hw16l9pcCf5AuND/7Vw==
CAA 13 2 3600 20260820000000 20260730000000 61177 knaw.nl. B+zc0hnMeTIC3VVhzegO9LgCn5kYkkTI04N88TtIuqqm8e8NgipEdjwQ 9VrHjhReQbpJZvbE8ugbqJIfQvlgdg==

NSEC

0 record(s)

—

Not configured

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:_spf.knaw.nl include:servers.mcsv.net ip4:5.39.185.32/29 ip4:185.181.140.187 ip4:87.253.234.71 ip4:87.253.234.73 ip4:87.253.234.85 include:spam1.htx.nl include:spf.mailjet.com include:_spf-dc55.sapsf.eu  include:spf.topdesk.net -all

DMARC

Configured

v=DMARC1; p=quarantine; rua=mailto:dmarc@knaw.nl; rf=iodef;

DKIM

Selector selector1

v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDFyVfURHJYiM/vI+GECQ7wlLvlAJg2zcPvzUMyK9yyHBTjEStv5UG/SFlW8AEkfid5o684z3V/NpBbvb+f1A0T+mz5LfBzjZlHVfrBmz0Q2XpNExwsi//3I5lm+2ByBHXoFB1GaPAZSPgQUhwSxnyUmNQ3XYC+XEKeT/K6uvaNtQIDAQAB; n=1024,1470427763,1486325363

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

Description

Welkom bij de Koninklijke Nederlandse Akademie van Wetenschappen

Final URL

https://www.knaw.nl/

HTTP status

200

HTTP

Status

HTTP/2 403

Final URL

https://knaw.nl/

Version

Server

awselb/2.0

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Hellenic Academic and Research Institutions CA

knaw.nl

Valid from

2025-12-11T02:38:23-06:00

Valid until

2026-12-11T02:38:23-06:00

Days remaining

123

Protocol

TLSv1.3

Cipher

TLS_AES_128_GCM_SHA256

Security headers

0 active

—

HSTSNot detected

—

Content Security PolicyNot detected

—

X-Content-Type-OptionsNot detected

—

X-Frame-OptionsNot detected

—

Referrer PolicyNot detected

—

Permissions PolicyNot detected

—

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

75.2.96.239, 99.83.229.36

261,62 ms

Cloudflare

1.1.1.1

75.2.96.239, 99.83.229.36

267,72 ms

Quad9

9.9.9.9

75.2.96.239, 99.83.229.36

268,83 ms

OpenDNS

208.67.222.222

75.2.96.239, 99.83.229.36

234,44 ms

AdGuard

94.140.14.14

75.2.96.239, 99.83.229.36

128,14 ms

IP, geolocation and ASNAssociated network information

99.83.229.36

No data

success

country

region

city

asn

organization

isp

75.2.96.239

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

knaw-nl.mail.protection.outlook.com

Port 25: Closed/unreachable - 25.4 ms - 
Port 465: Closed/unreachable - 4089.1 ms - 
Port 587: Closed/unreachable - 4021.3 ms -

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