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77
Total
100
DNS
20
Email
77
Security
85
Network
100
Availability
Domainsweb.cz
IPv41
IPv61
MX records4
StatusActive
Domain technical report

Seznam – najdu tam, co neznám

sweb.cz

Nejnavštěvovanější český internetový portál nabízející vyhledávač, e-mail, aktuální zprávy, předpověď počasí a odkazy, které se mohou hodit.

Generated: 2026-08-11T08:52:59-05:00 · 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 policy5 / 5 pts · Dns

Certificate authority restriction.

✓
DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓
MX records20 / 20 pts · Mail

4 MX record(s).

!
SPF0 / 25 pts · Mail

SPF policy not found.

!
DMARC0 / 25 pts · Mail

DMARC policy not found.

!
DKIM0 / 20 pts · Mail

No tested DKIM selector responded.

!
MTA-STS0 / 5 pts · Mail

Mail transport policy.

!
TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓
Valid TLS certificate55 / 55 pts · Security

70 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers12 / 35 pts · Security

3 of 9 evaluated headers detected.

✓
PTR reverse DNS30 / 30 pts · Network

PTR: static.seznam.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)
77.75.78.173

AAAA

1 record(s)
2a02:598:a::78:173

CNAME

0 record(s)
—

Not configured

MX

4 record(s)
20 mx2.seznam.cz.
10 mx1.seznam.cz.
50 mx50.seznam.cz.
60 mx60.seznam.cz.

TXT

0 record(s)
—

Not configured

NS

2 record(s)
ams.seznam.cz.
ans.seznam.cz.

SOA

1 record(s)
ans.seznam.cz. hostmaster.seznam.cz. 1786222207 900 300 604800 300

CAA

2 record(s)
0 iodef "mailto:abuse-caa@firma.seznam.cz"
0 issue "letsencrypt.org;validationmethods=dns-01"

DS

1 record(s)
1594 13 2 A19463D98FF0892FC30145E40B61E3D32764C73DBC78A1D8EA697F66 8FE5887F

DNSKEY

2 record(s)
256 3 13 XVysvqN+fNswC9E/E50udmZ4y0/BLBr6Dyerp932ztu0PjojBMsPhpCz QPZFK5svyhQYinf5DrmwcYcBKK2ulA==
257 3 13 XmAePSrzSCqB+BtI1NpGVNsX6g139EgAtxPi+NS0FqjEpbIAy+EkkLKr 6WF+4OcuiR+QhslTMrJo15pOCAHFdA==

RRSIG

3 record(s)
SOA 13 2 3600 20260820000000 20260730000000 5167 sweb.cz. JOkt6jmVL5kIe42C/67FYEpl/T+8sypm4qjDin3aeqyh59IoZ7NDdlO1 3NagOQ/yzmlB6y35zo+P5l7gdDfNrw==
NS 13 2 3600 20260820000000 20260730000000 5167 sweb.cz. r0HQldSlKe8Fgd3JpPWnH0bNFAue6Keu4Af2I4NJQ6gHtI64u25R+XMP MyeYrh2jQKDBj4RhQarZaVojffraew==
DS 13 2 3600 20260822201720 20260808184720 5166 cz. k8vi3Pdmq1/+Wcrc0h0rN8fmH3+1+frtskwuqSNovOsJmnQrp0KOFsFV GXZomMZdoYemguFfpca1HV4OQ9AymA==

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

Not configured
—

Not configured

DMARC

Not configured
—

Not configured

DKIM

Not found
—

Not configured

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
Seznam – najdu tam, co neznám
Description
Nejnavštěvovanější český internetový portál nabízející vyhledávač, e-mail, aktuální zprávy, předpověď počasí a odkazy, které se mohou hodit.
Final URL
https://www.seznam.cz/
HTTP status
200

HTTP

Status
HTTP/2 200
Final URL
https://www.seznam.cz/
Version
3
Server
envoy
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Let's Encrypt
CN
sweb.cz
Valid from
2026-07-23T01:03:03-05:00
Valid until
2026-10-21T01:03:02-05:00
Days remaining
70
Protocol
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384

Security headers

3 active
✓
HSTSImplemented
✓
Content Security PolicyImplemented
—
X-Content-Type-OptionsNot detected
✓
X-Frame-OptionsImplemented
—
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
77.75.78.173
34,73 ms
Cloudflare
1.1.1.1
77.75.78.173
363,05 ms
Quad9
9.9.9.9
77.75.78.173
410,07 ms
OpenDNS
208.67.222.222
77.75.78.173
682,35 ms
AdGuard
94.140.14.14
77.75.78.173
40,88 ms

IP, geolocation and ASNAssociated network information

77.75.78.173

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

mx2.seznam.cz

Port 25: Closed/unreachable - 1 ms - 
Port 465: Closed/unreachable - 242.6 ms - 
Port 587: Closed/unreachable - 4002.5 ms -

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