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83
Total
80
DNS
90
Email
65
Security
85
Network
100
Availability
Domaincern.ch
IPv41
IPv61
MX records1
StatusActive
Domain technical report

Home | CERN

cern.ch

Generated: 2026-08-08T20:42:33-05:00 · Cached result

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IPv41
IPv61
MX1
NS3

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

3 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 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

107 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: lbaas-73ae2b4e-5554-441e-b8e3-8d558b25f161.cern.ch

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 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)
188.184.77.250

AAAA

1 record(s)
2001:1458:d00:3c::100:2f9

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
10 cern-ch.mail.protection.outlook.com.

TXT

10 record(s)
"v=spf1 include:spf.cern.ch ?all"
"anthropic-domain-verification-4kfdsh=uvjsOh2bjwteama1zHsw7FZtw"
"google-site-verification=aoFc91q4kA9Xp_-Z_AFY1gI0AmXpTXIMcGseZfvH0J8"
"cursor-domain-verification-8t0p9r=J6wFIABgbtZfHacKasG8HDZ1p"
"mistral-domain-verification=3a255465ec599b8016fb91a2f8563cc304e3b95d"
"openai-domain-verification=dv-R5PuLWpZKT8QhVzrlbLDHvBz"
"MS=ms44269116"
"autodesk-domain-verification=5Lt81tqLuEgD4wCC73YQ"
"sinch-domain-verification=1fa8887b-9312-4ca2-85f8-75f7c1ba81fd"
"goqTmP4CYqgXEPONka9g8FCGD4vpvjieG4RI5NLxYZsBh/y5p88K9ym3zIFcLVbaYQdJkdhfYcjADXGdGMdSCA=="

NS

3 record(s)
scsnms.switch.ch.
ext-dns-2.cern.ch.
ext-dns-1.cern.ch.

SOA

1 record(s)
ext-dns-1.cern.ch. external-dns.cern.ch. 2013773015 1200 300 2419200 900

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

0 record(s)
—

Not configured

TLSA

0 record(s)
—

Not configured

SSHFP

0 record(s)
—

Not configured

SPF

Configured
v=spf1 include:spf.cern.ch ?all

DMARC

Configured
v=DMARC1; p=quarantine; sp=none; pct=100; rua=mailto:dmarc.rua@cern.ch; ruf=mailto:dmarc.rua@cern.ch; fo=1

DKIM

Selector selector1
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDHh89JkOAX8tJ9cDpd168o3F7cnDEuX4b8/fz8u5gAwz1FExlyf4EOZ2Q+aumHq9simdCDuks3eGwrV0wM4e/nmjDowOlCpQvFJIIDV5NK+wUr7La1eY9AxSDBGaFK+9D/0PJftLDVFhdk3Y8LVHXwaSedaespaUNCFpE6AetVoQIDAQAB; n=1024,1450809518,1466620718

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
Home | CERN
Description
Final URL
https://home.cern/
HTTP status
200

HTTP

Status
HTTP/1.1 200 OK
Final URL
https://home.cern/
Version
2
Server
openresty/1.27.1.2
X-Powered-By
PHP/8.4.23

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Sectigo Limited
CN
www.cern.ch
Valid from
2025-11-04T18:00:00-06:00
Valid until
2026-11-24T17:59:59-06:00
Days remaining
107
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
188.184.77.250
184,50 ms
Cloudflare
1.1.1.1
188.184.77.250
148,20 ms
Quad9
9.9.9.9
188.184.77.250
139,95 ms
OpenDNS
208.67.222.222
188.184.77.250
147,38 ms
AdGuard
94.140.14.14
188.184.77.250
154,91 ms

IP, geolocation and ASNAssociated network information

188.184.77.250

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

cern-ch.mail.protection.outlook.com

Port 25: Closed/unreachable - 35.8 ms - 
Port 465: Closed/unreachable - 4054.8 ms - 
Port 587: Closed/unreachable - 4021 ms -

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