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87
Total
95
DNS
90
Email
65
Security
85
Network
100
Availability
Domaincentrum.cz
IPv41
IPv61
MX records4
StatusActive
Domain technical report

Centrum.cz: Fandíme dobrému obsahu

centrum.cz

Centrum.cz je český internetový portál nabízející e-mail, aktuální zpravodajství, počasí a další zajímavé služby.

Generated: 2026-08-10T07:33:20-05:00 · Cached result

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IPv41
IPv61
MX4
NS2

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

2 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

4 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

146 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: static-redir.v.eint.cz

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/2 200

✓
HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

1 record(s)
46.255.231.129

AAAA

1 record(s)
2a00:da80:e::129

CNAME

0 record(s)
—

Not configured

MX

4 record(s)
20 centrum-cz-20mx2.eco-mx.cz.
10 centrum-cz-10mx1.eco-mx.cz.
20 centrum-cz-20mx1.eco-mx.cz.
10 centrum-cz-10mx2.eco-mx.cz.

TXT

5 record(s)
"v=spf1 redirect=_spf.centrum.cz"
"amazonses:zhwnMMKwePHOMKAE378OO5hqbD1h+VXiQvh7TgZFkQc="
"google-site-verification=uOQOS8Qfjty5hHS3I9DCL5P_t11ujP4VVpi9bjvBxao"
"google-site-verification=MEKZYb6k-z494g7Hs87mlSjL71DkzAiQve-iZuM6a7U"
"google-site-verification=q6tA5OYkNydQyUnQ63ncTNYRw0rLgXO2ASHL9BwgA4w"

NS

2 record(s)
pam.ns.cloudflare.com.
max.ns.cloudflare.com.

SOA

1 record(s)
max.ns.cloudflare.com. dns.cloudflare.com. 2411264255 10000 2400 604800 1800

CAA

0 record(s)
—

Not configured

DS

1 record(s)
2371 13 2 C9D4F1BE4E08E34803F056D2D93CA807B59997273C6102AC2956A45C 1D1587CF

DNSKEY

2 record(s)
257 3 13 mdsswUyr3DPW132mOi8V9xESWE8jTo0dxCjjnopKl+GqJxpVXckHAeF+ KkxLbxILfDLUT0rAK9iUzy1L53eKGQ==
256 3 13 oJMRESz5E4gYzS/q6XDrvU1qMPYIjCWzJaOau8XNEZeqCYKD5ar0IRd8 KqXXFJkqmVfRvMGPmM1x8fGAa2XhSA==

RRSIG

0 record(s)
—

Not configured

NSEC

1 record(s)
\000.centrum.cz. A NS SOA PTR HINFO MX TXT AAAA LOC SRV NAPTR CERT SSHFP RRSIG NSEC DNSKEY TLSA SMIMEA HIP CDS CDNSKEY OPENPGPKEY SVCB HTTPS URI 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 redirect=_spf.centrum.cz

DMARC

Configured
v=DMARC1; p=none; rua=mailto:dmarc@centrum.cz; ruf=mailto:dmarcf@centrum.cz

DKIM

Selector mail
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCfGs+NT0VvN/a1Dy+seIjjOBB8Y7ML2o61FdeNqvncTNJP75F+bW80iuqC9iJlRA+2NGtU1DPAGTblS4ujr+HWM8kcS2i9yaHMOt31exZhFmz8qrY3oUx9uTgy96sK5fmStqGokK5R0UQIV7zWJUZEVw/CETMkPmPKT3M1tmGd9wIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
Centrum.cz: Fandíme dobrému obsahu
Description
Centrum.cz je český internetový portál nabízející e-mail, aktuální zpravodajství, počasí a další zajímavé služby.
Final URL
https://www.centrum.cz/
HTTP status
200

HTTP

Status
HTTP/2 200
Final URL
https://www.centrum.cz/
Version
3
Server
cloudflare
X-Powered-By
Next.js

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Sectigo Limited
CN
*.centrum.cz
Valid from
2025-12-10T18:00:00-06:00
Valid until
2027-01-03T17:59:59-06:00
Days remaining
146
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
46.255.231.129
77,61 ms
Cloudflare
1.1.1.1
46.255.231.129
37,69 ms
Quad9
9.9.9.9
46.255.231.129
38,83 ms
OpenDNS
208.67.222.222
46.255.231.129
39,19 ms
AdGuard
94.140.14.14
46.255.231.129
49,02 ms

IP, geolocation and ASNAssociated network information

46.255.231.129

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

centrum-cz-20mx2.eco-mx.cz

Port 25: Closed/unreachable - 246.6 ms - 
Port 465: Closed/unreachable - 365.7 ms - 
Port 587: Closed/unreachable - 4020.9 ms -

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