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Total

100

DNS

Email

Security

Network

100

Availability

Domaincuni.cz

IPv41

IPv61

MX records2

StatusActive

Domain technical report

Univerzita Karlova

cuni.cz

Generated: 2026-08-09T00:53:50-05:00 · Cached result

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IPv41

IPv61

MX2

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

2 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

16 day(s) remaining.

Certificate lifetime6 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers4 / 35 pts · Security

1 of 9 evaluated headers detected.

✓

PTR reverse DNS30 / 30 pts · Network

PTR: 54.0/25.89.113.195.in-addr.arpa

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/2 200

✓

HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

1 record(s)

195.113.89.54

AAAA

1 record(s)

2001:718:1e03:622::60

CNAME

0 record(s)

—

Not configured

MX

2 record(s)

10 ag1.cesnet.cz.
10 ag2.cesnet.cz.

TXT

5 record(s)

"google-site-verification=52QIa-wnhi8U3xyitTyH9czyXoo3OkkFbqzAJW7U5HM"
"google-site-verification=T4H_GYV-wpMp1W0zdIt62whR5pTIIr9HOSoS75qomrs"
"google-site-verification=LazYVCEv9A_edcp-AQV8RBrOcYmEyvoC1t68iOp7tSI"
"apple-domain-verification=S8ZUNOXpX2OWxGom"
"v=spf1 ip6:2001:718:1e03:4::16 a:out.ruk.cuni.cz a:dec59.ruk.cuni.cz a:golias.ruk.cuni.cz a:igraine.lfhk.cuni.cz a:office2.cesnet.cz mx:is.cuni.cz include:spf.protection.outlook.com -all"

NS

4 record(s)

cuce.ruk.cuni.cz.
david.ruk.cuni.cz.
golias.ruk.cuni.cz.
nsa.ces.net.

SOA

1 record(s)

golias.ruk.cuni.cz. hostmaster.cuni.cz. 2026072955 28800 7200 1209600 600

CAA

4 record(s)

0 issue "harica.gr"
0 issue "letsencrypt.org"
0 issue "digicert.com"
0 iodef "mailto:tcs@cuni.cz"

DS

1 record(s)

43474 13 2 F030314D575105B12FA185AA8572386B6A54A9C8A238736320C36280 38DFE20C

DNSKEY

1 record(s)

257 3 13 CRfC63IEp1cb9ALSIHYAFosTvel5Pr7I0KRXgcNMw9JbBO0mba2hBtB+ 82IdFwOa48PnBNoMl3rZohtZLxy07g==

RRSIG

6 record(s)

DNSKEY 13 2 3600 20260819024726 20260805022737 43474 cuni.cz. 4j5izjRbdsg/prr7nLoNsKoZRNjDgGKDP9KMpbUk0aNr6ZxsU2UBNACj R7UZUWGEWiFfzqPrXePY2nI8Gd/Qzw==
NS 13 2 86400 20260818095304 20260804093954 43474 cuni.cz. DmacvR9O6eNCwqsdty7MSem9oVKFRZkbFmzA0J4bYTJbiSyxz+XAIj9M wH5097Oll0om8a9f4A3Ho5i21yKXBw==
MX 13 2 3600 20260820122711 20260806112935 43474 cuni.cz. aPwUUhKEIf0F/gENkQjzlvc88FT/19KIccvP5euj+nxqGlg4xa/ivpbN E16pRKXxemPMfyZ/6YnLZFYfkojVWg==
AAAA 13 2 3600 20260818172556 20260804171558 43474 cuni.cz. puVY/56RcQFjeu8x58TIw6K1zh4qCpG2WHz0YIk8rdlW2Usi8iSSrbk/ jzFWCHXzPrGZ+Sug9wIcEiwT8KVyOw==
DS 13 2 3600 20260809082134 20260726065134 5166 cz. 7j6YQ7qOMJKK7dd/oqdjDoWU2CC1MK0z+69BZe7UzcP0c9nkG/oZQqpm ACSSjQAhTWA9rbQf81DkJTNaFw7TPw==
CAA 13 2 7200 20260819025011 20260805024307 43474 cuni.cz. kDxze+fn2cQazMFP9F935d3rOX6leTkG6JS2G2ia8q9zGQ4/ko0L5B4D JaRytF1opqAYgfmpDqInnv4H1DF+jg==

NSEC

1 record(s)

www1.1f1.cuni.cz. A NS SOA MX TXT AAAA RRSIG NSEC DNSKEY CDS CDNSKEY 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 ip6:2001:718:1e03:4::16 a:out.ruk.cuni.cz a:dec59.ruk.cuni.cz a:golias.ruk.cuni.cz a:igraine.lfhk.cuni.cz a:office2.cesnet.cz mx:is.cuni.cz include:spf.protection.outlook.com -all

DMARC

Configured

v=DMARC1; p=quarantine; sp=none; rua=mailto:postmaster-dmarc@cuni.cz

DKIM

Selector selector1

v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCJU6KmjmV9+L1QfyrPwf44qeCCH+Kkml9dddLC+PeeUqXJ59eur4UqM1Jx/BqHcZhJhoTkUHKDxQmx8misjKzu62W4Xvb9oJEwpKp4wXuNQ6D3o7y72rHEsGgnbvccmoiIlkqHqa3ePJ8lKUEOgnl7viAdmcLEASkZx5nJ1ui3xwIDAQAB; n=1024,1451071895,1466883095

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

Univerzita Karlova

Description

Final URL

https://cuni.cz/

HTTP status

200

HTTP

Status

HTTP/2 200

Final URL

https://cuni.cz/

Version

Server

nginx

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Hellenic Academic and Research Institutions CA

www.cuni.cz

Valid from

2025-08-25T06:05:25-05:00

Valid until

2026-08-25T06:05:25-05:00

Days remaining

Protocol

TLSv1.3

Cipher

TLS_AES_256_GCM_SHA384

Security headers

1 active

✓

HSTSImplemented

—

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

195.113.89.54

41,07 ms

Cloudflare

1.1.1.1

195.113.89.54

143,54 ms

Quad9

9.9.9.9

195.113.89.54

50,49 ms

OpenDNS

208.67.222.222

195.113.89.54

853,55 ms

AdGuard

94.140.14.14

195.113.89.54

143,54 ms

IP, geolocation and ASNAssociated network information

195.113.89.54

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

ag1.cesnet.cz

Port 25: Closed/unreachable - 122.7 ms - 
Port 465: Closed/unreachable - 250.1 ms - 
Port 587: Closed/unreachable - 131.7 ms -

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