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68
Total
90
DNS
20
Email
65
Security
50
Network
100
Availability
Domainabclinuxu.cz
IPv41
IPv60
MX records1
StatusActive
Domain technical report

abclinuxu.cz

abclinuxu.cz

Generated: 2026-08-11T09:00:51-05:00 · Cached result

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IPv41
IPv60
MX1
NS3

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

1 IPv4 address(es) detected.

!
IPv6 (AAAA)0 / 10 pts · Dns

0 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 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).

!
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

47 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: nds1.nitemedia.cz

i
IPv4 diversity20 / 35 pts · Network

Two or more IPv4 addresses receive full points.

!
IPv6 connectivity0 / 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)
171.25.221.158

AAAA

0 record(s)
—

Not configured

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
10 nds1.nitemedia.cz.

TXT

0 record(s)
—

Not configured

NS

3 record(s)
ns1.websupport.cz.
ns2.websupport.cz.
ns3.websupport.eu.

SOA

1 record(s)
ns1.websupport.cz. admin.websupport.cz. 1781090932 7200 2048 1048576 2560

CAA

2 record(s)
0 issue "digicert.com"
0 issue "letsencrypt.org"

DS

1 record(s)
50502 13 2 7F4B039FC4754114379EA7C62B14E8DAD96C6CDDAD49D33998A70692 5F63CAF3

DNSKEY

2 record(s)
257 3 13 9gBqpuzVeXk/gR9qL7YNLpZ3ZoBp8zGOJn8vx4J/c9nbKiBEpfaES7i9 jaoIC7vQt/9qWYobcvH+kDRD/FH61w==
256 3 13 +W2JOWfOhtg5eBVPihOecHnpN0TluLXUy4z5v8oQSzffY/zjdmWNd8Ob PTtZHnPMGr2vPDVPzHFiQlX/kWQukw==

RRSIG

4 record(s)
SOA 13 2 86400 20260903174359 20260803161359 1490 abclinuxu.cz. p8x6zjjqeWJ334QLyyngVLcR52PZOMvR5IyLAoGDKgqCHjNaStp9IkRs bfBckgfmyrSREXXnYvwb6hR9pBQXUw==
MX 13 2 900 20260903174359 20260803161359 1490 abclinuxu.cz. NobpTYYx/h4OiBPEytnFg0zNJYXhBIlWmrKXiCxdxzsNRHi1n4ZkDldQ 3aUDLFb1/aaA2QvZ13zoYkgZ7qBIqQ==
DS 13 2 3600 20260823054724 20260809041724 5166 cz. kGc0Z4bzAKNmLqpSQ5r0nEy6cI1lj8sr1+ueFFFLIzjDyu/vpvXMc2EM rZkjW+7KWONsxpNuCw+EIesd3Y5VOQ==
CAA 13 2 900 20260903174359 20260803161359 1490 abclinuxu.cz. o0bfUmSHLNNd8W81NYE4B+y+0RduAgR72SpRf42aiMfW/uDkv82DfKRO njdo3IDBIHaej2QndiS2HHVvvxyi+g==

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

No data
Title
Description
Final URL
https://abclinuxu.cz/
HTTP status

HTTP

Status
HTTP/1.1 200 OK
Final URL
https://www.abclinuxu.cz/
Version
2
Server
nginx
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Let's Encrypt
CN
abclinuxu.cz
Valid from
2026-06-30T01:09:09-05:00
Valid until
2026-09-28T01:09:08-05:00
Days remaining
47
Protocol
TLSv1.2
Cipher
ECDHE-RSA-AES256-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
171.25.221.158
193,69 ms
Cloudflare
1.1.1.1
171.25.221.158
175,87 ms
Quad9
9.9.9.9
171.25.221.158
293,66 ms
OpenDNS
208.67.222.222
171.25.221.158
78,64 ms
AdGuard
94.140.14.14
171.25.221.158
381,62 ms

IP, geolocation and ASNAssociated network information

171.25.221.158

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

nds1.nitemedia.cz

Port 25: Closed/unreachable - 36.4 ms - 
Port 465: Closed/unreachable - 117.2 ms - 
Port 587: Closed/unreachable - 153.6 ms - 220 nds1.nitemedia.cz ESMTP Postfix (Debian/GNU)

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