Domain technical report
Katalog firem a institucí • Firmy.cz
firmy.cz
Katalog ověřených firem v ČR. Pravidelně aktualizovaný seznam firem a institucí, aktuální kontakty a uživatelské recenze firem.
IPv41
IPv61
MX2
NS2
Analyze any domain
Get a complete DNS, email, SSL, HTTP and network analysis in seconds.
88
Total
100
DNS
70
Email
81
Security
85
Network
100
Availability
Domainfirmy.cz
IPv41
IPv61
MX records2
StatusActive
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
2 MX record(s).
SPF25 / 25 pts · Mail
SPF policy published.
DMARC25 / 25 pts · Mail
DMARC policy published.
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
57 day(s) remaining.
Certificate lifetime10 / 10 pts · Security
Full points require at least 30 days remaining.
HTTP security headers16 / 35 pts · Security
4 of 9 evaluated headers detected.
PTR reverse DNS30 / 30 pts · Network
PTR: firmy.cz
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)77.75.76.191
AAAA
1 record(s)2a02:598:2::191
CNAME
0 record(s)—
Not configured
MX
2 record(s)20 bb4bdcba74d9f0f3.mx2.emailprofi.seznam.cz. 10 bb4bdcba74d9f0f3.mx1.emailprofi.seznam.cz.
TXT
4 record(s)"google-site-verification=ViVc6KWNXO3_7cy77wSDVVTv3PgKi7F1ziZ9nuOCMg4" "v=spf1 include:spf.szn.cz ip4:178.251.187.28 ip6:2a00:1ed0:45::d3 ~all" "google-site-verification=_rqmNTKCjKuRqIfPzJnNIXLGK7ra_0lXAFnv4Eg_h4E" "facebook-domain-verification=pws60mi9w3wjkjosdl8jcifztkb4l9"
NS
2 record(s)ans.seznam.cz. ams.seznam.cz.
SOA
1 record(s)ans.seznam.cz. hostmaster.seznam.cz. 1785974400 900 300 604800 300
CAA
2 record(s)0 iodef "mailto:abuse-caa@firma.seznam.cz" 0 issue "letsencrypt.org"
DS
1 record(s)7167 13 2 E5375568BE0A8D3B5AAE2B7CFE5B97871965D953367FC6EFD213E3E8 9FF209E1
DNSKEY
2 record(s)257 3 13 2nbcy7Yt1gjotOPHLhF/cK2TotCSk4T1cB01k/ZSYbtfPVZP8UhIecad /jFs/IOSqACTdvhY34ZwzZzy4WlNng== 256 3 13 KpPcbxXuAbJ1RMhXF/K6y5eY5OqafgukcsYRSoBFrEVvKzQ3XqsdQDVo tHD2bWrj0LD8rBrXBRoiIp4VeN8Arw==
RRSIG
5 record(s)TXT 13 2 300 20260820000000 20260730000000 38873 firmy.cz. e9DhD8LO15RuIeGwFXebDNB99v3+ELoyBKsYtoaUAVw/baovjO2uZIL+ eeLQ+mAcaNfQfXDDl++Ia5BxFLi4mg== MX 13 2 300 20260820000000 20260730000000 38873 firmy.cz. qrlaWjJDVYM/6tRWBT9FEXx0HXBLJIkXLF0DxhEjpdT742DmR6zoZ6qv 2n2wHiHbWr2TQc2zRIwUUXCxtuefPw== AAAA 13 2 3600 20260820000000 20260730000000 38873 firmy.cz. arpTOyFOk9D8yC0kMOWMqcImUZrCv2C+tQsxjzHFRLy3iYLoq3UPs4EO GxfD3COAoE0c29C+8NLmLOdwsVO/HA== DS 13 2 3600 20260823054724 20260809041724 5166 cz. s2FQ56o4LxYBggsIIJvTITen9Y22Hq9AbPgFR5HBALb2aNZV/+fh4e2A grt3BySsRZ7pitvgll7DIRThx4Q2ig== CAA 13 2 3600 20260820000000 20260730000000 38873 firmy.cz. YRCc5xKUCf9AXT9AeSbo2DyKEKG3/EAEcke1w4qWdyAAXEXvh7Pwra9I w801HfD7owd+xLnAWdPdtHuEqeEh/A==
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
Configuredv=spf1 include:spf.szn.cz ip4:178.251.187.28 ip6:2a00:1ed0:45::d3 ~all
DMARC
Configuredv=DMARC1; p=reject; rua=mailto:abuse@seznam.cz,mailto:dmarc-rua@mailkit.com;
DKIM
Not found—
Not configured
Analyzed webpageMetadata and HTTP response
Title and description
ExtractedTitle
Katalog firem a institucí • Firmy.cz
Description
Katalog ověřených firem v ČR. Pravidelně aktualizovaný seznam firem a institucí, aktuální kontakty a uživatelské recenze firem.
Final URL
https://www.firmy.cz/
HTTP status
200
HTTP
Status
HTTP/2 200
Final URL
https://www.firmy.cz/
Version
3
Server
envoy
X-Powered-By
SSL and HTTP securityCertificate, protocol and security headers
SSL certificate
AvailableAvailable
Yes
Issuer
Let's Encrypt
CN
*.firmy.cz
Valid from
2026-07-09T05:07:37-05:00
Valid until
2026-10-07T05:07:36-05:00
Days remaining
57
Protocol
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384
Security headers
4 activeHSTSImplemented
Content Security PolicyImplemented
X-Content-Type-OptionsImplemented
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
ConsistentConsistent propagation
5 public resolvers queried.
ResolverServerResultLatency
Google
8.8.8.877.75.76.191
52,20 ms
Cloudflare
1.1.1.177.75.76.191
365,87 ms
Quad9
9.9.9.977.75.76.191
277,14 ms
OpenDNS
208.67.222.22277.75.76.191
26,74 ms
AdGuard
94.140.14.1477.75.76.191
143,50 ms
IP, geolocation and ASNAssociated network information
77.75.76.191
No datasuccess
No
country
region
city
asn
organization
isp
Visitor information
Visitorip
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
bb4bdcba74d9f0f3.mx2.emailprofi.seznam.cz
Port 25: Closed/unreachable - 124 ms - Port 465: Closed/unreachable - 122.7 ms - Port 587: Closed/unreachable - 4152.5 ms -