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80
Total
100
DNS
90
Email
65
Security
85
Network
60
Availability
Domainsurf.nl
IPv41
IPv61
MX records1
StatusActive
Domain technical report

SURF is de ict-coöperatie van onderwijs en onderzoek | SURF.nl

surf.nl

Meer dan 100 onderwijs- en onderzoeksinstellingen in Nederland werken in de coöperatie SURF samen om de kansen van digitalisering ten volle benutten. Het doel: beter en flexibeler onderwijs en onderzoek.

Generated: 2026-08-12T10:01:21-05:00 · Cached result

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IPv41
IPv61
MX1
NS4

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

1 IPv4 address(es) detected.

✓
IPv6 (AAAA)10 / 10 pts · Dns

1 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

177 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: revproxy20.surfnet.nl

i
IPv4 diversity20 / 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

No successful HTTP response.

✓
HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

1 record(s)
192.87.108.15

AAAA

1 record(s)
2001:610:508:108:192:87:108:15

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
10 surf-nl.mail.protection.outlook.com.

TXT

10 record(s)
"4KpnMi9KFXJveaqCcl7taNkGhTxHDB0ITMkEidiOEJa5vdx2+L/on3nrIAGKkvhZ8dnPomZoqaZK3Dhp+a9Ilg=="
"mentimeter-5e1dbed6-22e8-40bb-983d-cfb0d2f07fcd"
"HARICA-VWehW3vMzUEjKiV5qUi"
"adobe-idp-site-verification=bb247cf6e0162a264df1886109d59464c0de78dd3f1e04091bca1c4bf93d10cd"
"LwdgkMB+IUPOT7+0YXpUA6xInAPm/QkgJGuSci6msn1oZh76zdu2DuXkol9DSKQ4S50VZhZAxZvfRqwpaD7pCw=="
"google-site-verification=eBmfmfF08EHY7J6CNUWO3k_iKc1hisioiNIYDZ7l3nc"
"bw=vBRo1av7Hlff58uTo8JYIGGG1dVp67IqBa9Et9JaLpnr"
"MS=ms58073161"
"apple-domain-verification=g7uZuYdCUCKUQJEh"
"v=spf1 include:mailplus.nl include:soverin.net include:spf.protection.outlook.com include:spf.surf.nl include:mail.zendesk.com ~all"

NS

4 record(s)
ns2.surfnet.nl.
ns1.surfnet.nl.
ns1.zurich.surf.net.
ns3.surfnet.nl.

SOA

1 record(s)
ns1.surfnet.nl. dns-beheer.surf.nl. 2026081101 10800 3600 604800 3600

CAA

3 record(s)
0 issue "sectigo.com"
0 issue "harica.gr"
0 issue "letsencrypt.org"

DS

1 record(s)
58740 13 2 487E2E0415E08343E574D030B9CA251AD8724356787BE701D8253AED 37A3CB4E

DNSKEY

1 record(s)
257 3 13 4IR7f3ESL8J06JhUhNkX6/bToN4IvpY22623AXrVPmXDW/6Iu8DCSSWn Eb6UwT0RyY5b+9yUT9nc7w/mXwXQ/w==

RRSIG

4 record(s)
TXT 13 2 3600 20260820000000 20260730000000 58740 surf.nl. iNpX+78DqVNGX0AQzCQ4+Dovf/egQbR5Tixs89WQXrBYn0vBTxkCIWfD OYoHkkV/wvk/gWb9mJ8MpHA8jJqauA==
MX 13 2 3600 20260820000000 20260730000000 58740 surf.nl. LlICiBkwzuLevjz1fUdsV+Z05NSPbMcDiD3ebLPC0X2N5+3+XWbok+58 D6ciUQd/hOuFaOjq16/3qVNJlTN6+w==
DS 13 2 3600 20260831153851 20260803080721 467 nl. S2nYxIzdBEnB9E+KsdM0z+XEiuxEZubumxhJ38MbRAsZpXQ59VHNkfUa 2epKECOk42fOqMRX8TYIy+U/fwjENQ==
CAA 13 2 3600 20260820000000 20260730000000 58740 surf.nl. 9DgRcJzrky1nIYg2GisgR615gEQV7njNpqaD5limdo1Zznf0BP1J5u8Q Uckith+x131Wv04BbtzEwDlhB3VuPQ==

NSEC

0 record(s)
—

Not configured

NSEC3

0 record(s)
—

Not configured

SRV

0 record(s)
—

Not configured

NAPTR

1 record(s)
50 50 "s" "x-eduroam:radius.tls" "" _radsec._tcp.eduroam.nl.

TLSA

0 record(s)
—

Not configured

SSHFP

0 record(s)
—

Not configured

SPF

Configured
v=spf1 include:mailplus.nl include:soverin.net include:spf.protection.outlook.com include:spf.surf.nl include:mail.zendesk.com ~all

DMARC

Configured
v=DMARC1; p=reject; rua=mailto:di6leuvu@ag.eu.dmarcadvisor.com;

DKIM

Selector selector1
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC5aO5P8+nJ75FCfagr+eJXNtQp9NPAvn4EnGl4FfqOatSf3NLtlhBIGY5R22k3eMRPDn0q/n36SCtLHiXFqNAR7dF/x2VKuNxFphe2Qpocwnlhagg21qi33ABpj8Uh8IC3YdS96jK3lStBMfJ+V36Kv3Ct6G1cYtdFm1Y1QA+OYQIDAQAB; n=1024,1453413335,1

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
SURF is de ict-coöperatie van onderwijs en onderzoek | SURF.nl
Description
Meer dan 100 onderwijs- en onderzoeksinstellingen in Nederland werken in de coöperatie SURF samen om de kansen van digitalisering ten volle benutten. Het doel: beter en flexibeler onderwijs en onderzoek.
Final URL
https://www.surf.nl/
HTTP status
200

HTTP

Status
Final URL
https://surf.nl/
Version
0
Server
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Hellenic Academic and Research Institutions CA
CN
surf.nl
Valid from
2026-07-22T08:20:46-05:00
Valid until
2027-02-06T07:20:45-06:00
Days remaining
177
Protocol
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384

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
192.87.108.15
140,44 ms
Cloudflare
1.1.1.1
192.87.108.15
265,72 ms
Quad9
9.9.9.9
192.87.108.15
272,46 ms
OpenDNS
208.67.222.222
192.87.108.15
491,78 ms
AdGuard
94.140.14.14
192.87.108.15
140,80 ms

IP, geolocation and ASNAssociated network information

192.87.108.15

No data
success
No
country
region
city
asn
organization
isp

Visitor information

Visitor
ip
216.73.216.212
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

surf-nl.mail.protection.outlook.com

Port 25: Closed/unreachable - 36.3 ms - 
Port 465: Closed/unreachable - 4040.8 ms - 
Port 587: Closed/unreachable - 4041.1 ms -

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