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85
Total
85
DNS
90
Email
84
Security
50
Network
100
Availability
Domaincwi.nl
IPv41
IPv60
MX records1
StatusActive
Domain technical report

Home

cwi.nl

Generated: 2026-08-08T20:13:54-05:00 · Cached result

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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 chain15 / 15 pts · Dns

DS and DNSKEY detected.

!
CAA policy0 / 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

182 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers19 / 35 pts · Security

5 of 9 evaluated headers detected.

✓
PTR reverse DNS30 / 30 pts · Network

PTR: cwi.nl

i
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/1.1 200 OK

✓
HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

1 record(s)
192.16.191.48

AAAA

0 record(s)
—

Not configured

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
10 mx.soverin.net.

TXT

10 record(s)
"HARICA-SnDN4Irx82qOUXNni8S"
"MS=ms63043750"
"CWI (Centrum Wiskunde & Informatica)=pnqgTeOiurzbz4yD"
"adobe-idp-site-verification=a8667c98581a66df82f18dd9b4ec9ad04d2b0214fda298afa04b69ae89b16b4d"
"apple-domain-verification=vKvt2VfbB2WZUhzQ"
"Science Park 123, 1098 XG Amsterdam, Netherlands"
"ZOOM_verify_QtFtKLPNUTBlqUfH6kXTNZ"
"ZOOM_verify_-TwabqfPQI2RrsWzDjTwfQ"
"v=spf1 ip4:192.16.191.0/27 ip4:192.174.88.179 ip4:192.174.88.180 ip4:13.58.74.171 include:_spf.surfmailfilter.nl include:projects5.greenlightsolutions.nl include:spf.protection.outlook.com ~all"
"Centrum Wiskunde & Informatica"

NS

4 record(s)
ns1.zurich.surf.net.
ns2.cwi.nl.
dwalin.nikhef.nl.
ns1.cwi.nl.

SOA

1 record(s)
ns1.cwi.nl. hostmaster.cwi.nl. 2026072001 28800 7200 604800 43200

CAA

0 record(s)
—

Not configured

DS

1 record(s)
56785 8 2 14C2AF77C4F5C1A4DDC95943A215F4FF8BFCA17FF11A351CC2A487F3 DA77F328

DNSKEY

2 record(s)
256 3 8 AwEAAcqAbiAUl+LRRHQohiLVU6j4eAIdVC3f5nOEr4RitxYiSzimJlz0 0Fk2j7yqwDohGbm1mQ8jN75QWTN1y36klN62oj3GzNFgFAm0AU4UqCqQ AzhH3bO/6KYvQjGxl2C5MYAhlFIQukKT5ZMojbkaDPPMmUeaoRGpmN6v 0Itus9Dd
257 3 8 AwEAAaLgTgDQgiJ3w1AqTwzxPEB+0HSPpw5peFRdLW4Ju6rtdFD1wJTT iGe/yWCHqQk2xuQdiKRNNGXCgM8UlYs2h+zopJHOU/lybzF3fJD2Ur9o SQ+tWGRg0YVmXHXBHXi1Yub6AhpDkEH3XClhRLZeZMdVoCZeB7UVrqaT i2dIoTopPF+hXCQgus+dLJgn/0KYfGYy2Xx2xU99haVY32YrjFeCIQPL UGzd2Y7akzaFhq8wzYEIse5qnefbLmbT+bJq+jQH2vY3E/ste5ATgORG 5SGGKSKG+lC+r7H1mpj88J41by8g0ZkmOJRtN99sR0IcDRq8VH5KHIVo xGHj/IrtQRE=

RRSIG

9 record(s)
DNSKEY 8 2 86400 20260918101538 20260720101538 32073 cwi.nl. p0gJR2ELjBxJRlVceRjrYzrbbg5zbqPF1DHsglE6eJWPeEg5syhI5M8f OwEwFTPHDPBCcYGxldK2yNo7XVTio4o9ttsC2zzQpY0zRBUwEh9KaPyx GdblvutANzcTDJCOAk54cqeyyMW/h4IH07vXlb+loGAs5ikN8+wpg7J7 hKQ=
DNSKEY 8 2 86400 20260918101538 20260720101538 56785 cwi.nl. fM+5MGsaPbZ886qoa/qtjuKOQJq8NdAxeqJoc0Tye/YT+mdSBgF7ROA4 0/tavVAuspdsIpF5Xj0Wnx3RENPAAseNuG4DKuh2QUCdCr4cZExTzNcM 9uL7MdzIyLosJTeyfISyruhcV09cVvKPtH2qKPiOeuUQoLXuQdMowBDy pcrw0LPgps3pl3zz78kV+iZ7VREc+moyq+pUWPklI11U0FEIdY3YTAop PEPLyJWPlPTmo5JB8qseQAif9ag0iaLb2bF1ln9741tTokQYJpG6TkkZ 22B71+oOzgAb4aCxzrvnUECBwKqZeiD1sKO7fwhv4cDmpv42Yr0WK4oh DPy8KA==
TXT 8 2 86400 20260918101538 20260720101538 32073 cwi.nl. LQD2z9qIMrUjfwnAL/U/iuLNgad0jaJ0CTUaWmrigaCIM7qTI4Fiit76 JnE2POkeRAfxyLEkFRwSX7pHvHF97PZYyZtlURGfZBN69tBW6sD/mDBF nFjX19ERvU4IpGcJ5qFJzYztFAPN8pSMd1sqY5z8rye5pXTTrJQxmmjd 7H8=
MX 8 2 300 20260918101538 20260720101538 32073 cwi.nl. YCku8SyjjwvbF2eCuGTHQ3gksspvX3hv0n05BatQ2T1hCTY4SJtwM/WV Z/g7HoxMfG3ESeYdHouu8D/rY3JjII9zh7TJJKwDltfMewPVlEVBnNj2 wf9DFmlTBRilXEfhAdd2i7ccRg+aJd1k1HEmUDaGXTaWP4F/O7oC5/ru k3w=
A 8 2 86400 20260918101538 20260720101538 32073 cwi.nl. RaA6Hh69JeGdF6BQRousvOHr6lpS5jSpLSJzG3hRwNb26Y45uUteufb5 NIiyoTnskqVehaNS+F9+n9TaJqkvzah0sg0gyaF6ZBk/mPPJctshcXwG ywItl5XCq6AhG1JIWgyu81blbccvxfLQ0ps2I1NNs6zHu2icmUkTpgu8 2dU=
NS 8 2 86400 20260918101538 20260720101538 32073 cwi.nl. aXFfU/oEY/86zYlc7G4oxAhP+wWJWCV5xU/dzxTSKgg0svAka1OFcUR7 f29gNbBChTUCAJYyLLI7JmOs/TqWs5ogRIxspZ/wXQMR84v9LgCci4D3 NZUZM97xK4avcU0GlpmvJ0KBVJuYfYKmN5Yc9nbffBr5c3bRKNa6FDX3 C9s=
SOA 8 2 86400 20260918101538 20260720101538 32073 cwi.nl. dQ37UDeZ9IRkV7iC8hAJde7U1nnUGaAEyBl+Nl5saqEuaLy71kxBhY31 6sCQiAhsqUReO9TmQsdZlRvXhFVnVkvhw2IpvEoyhioyEH6Xh9qIbPYm rVJhz6gLuUj1+8Xxd0vzHm9Y0SOmhYUKwbIo9RQsDGTt0pz9HxYWBMzO sQc=
DS 13 2 3600 20260823130833 20260726050723 467 nl. lCBvv84iXVi7emK2ZW9Gq2kLzZPaMZoxXxZet/3Jl+NisLqUSCypawkb GjBxHcPInyVoEZnLdYudzb9Wx2Sr4A==
NSEC3PARAM 8 2 0 20260918101538 20260720101538 32073 cwi.nl. trBhpOYpkuzKPOA3OOtqzOel7b+mmssYtRO9+or0HXdCY4kMGgXM5MMu zW/s+eIkj8XAzlJwK/CJ/jBCk3bNlgbJkxebjItmtbIPDGFfQYt2HrPq XW+0sJE7T/OuIYoV/soSTLg833wK+8tWMwQiWibAuNgz6rJICg9XvnrZ U7A=

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 ip4:192.16.191.0/27 ip4:192.174.88.179 ip4:192.174.88.180 ip4:13.58.74.171 include:_spf.surfmailfilter.nl include:projects5.greenlightsolutions.nl include:spf.protection.outlook.com ~all

DMARC

Configured
v=DMARC1;p=quarantine

DKIM

Selector default
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDgFbxWcu/m9TuCvj7xwjZX4s9fWAdi/NIFBUF9vTKQOSt9F/aVGVc6g5/yu+nbilhlMSQaUSbr9chbeTIwmqHmISOqr2svn4zXdRdkY1RWo6BzdDe+xo0FnWxRQpTT7rjO6XmZ8mFeWmwlzgaWDbqHdk9fS7DZi5j1Bnozq1aENQIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
Home
Description
Final URL
https://www.cwi.nl/en/
HTTP status
200

HTTP

Status
HTTP/1.1 200 OK
Final URL
https://www.cwi.nl/en/
Version
2
Server
nginx
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Hellenic Academic and Research Institutions CA
CN
cwi.nl
Valid from
2026-07-23T06:21:23-05:00
Valid until
2027-02-07T05:21:22-06:00
Days remaining
182
Protocol
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384

Security headers

5 active
✓
HSTSImplemented
—
Content Security PolicyNot detected
✓
X-Content-Type-OptionsImplemented
✓
X-Frame-OptionsImplemented
✓
Referrer PolicyImplemented
—
Permissions PolicyNot detected
✓
Cross-Origin-Opener-PolicyImplemented
—
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
192.16.191.48
158,90 ms
Cloudflare
1.1.1.1
192.16.191.48
256,41 ms
Quad9
9.9.9.9
192.16.191.48
175,68 ms
OpenDNS
208.67.222.222
192.16.191.48
320,25 ms
AdGuard
94.140.14.14
192.16.191.48
133,74 ms

IP, geolocation and ASNAssociated network information

192.16.191.48

No data
success
No
country
region
city
asn
organization
isp

Visitor information

Visitor
ip
216.73.217.62
reverse
country
country_code
region
city
latitude
longitude
isp
organization
asn
timezone
browser
Other
os
Other
language
user_agent
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
is_bot
Yes
cloudflare
No

SMTPEmail port connectivity

mx.soverin.net

Port 25: Closed/unreachable - 10.1 ms - 
Port 465: Closed/unreachable - 4028.8 ms - 
Port 587: Closed/unreachable - 4021.2 ms -

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