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92
Total
95
DNS
90
Email
84
Security
85
Network
100
Availability
Domaincoi.cz
IPv41
IPv61
MX records1
StatusActive
Domain technical report

ČOI – Česká obchodní inspekce kontroluje a dozoruje právnické a fyzické osoby prodávající nebo dodávající výrobky a zboží na vnitřní trh, poskytující služby nebo vyvíjející jinou podobnou činnost na vnitřním trhu, poskytující spotřebitelský úvěr nebo provozující tržiště (tržnice) pokud podle zvláštních právních předpisů nevykonává dozor jiný správní úřad.

coi.cz

Generated: 2026-08-11T07:21:07-05:00 · Cached result

JSONCSVPDFVisit site
IPv41
IPv61
MX1
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

1 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

72 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers19 / 35 pts · Security

5 of 9 evaluated headers detected.

✓
PTR reverse DNS30 / 30 pts · Network

PTR: 79.16.155.104.bc.googleusercontent.com

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/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)
104.155.16.79

AAAA

1 record(s)
2600:1900:4010:cc4::

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
0 coi-cz.o-v1.mx.microsoft.

TXT

4 record(s)
"v=spf1 a mx ip4:213.195.199.180 ip4:213.195.199.179 include:spf.protection.outlook.com -all"
"3cm65x8m01l90f3y531fn6cdmwknrztf"
"MS=75DD76990965786EAF6D64424FC315C80B2B1ED1"
"cb3tqxs6w619gznqdrwfwwp6z4y01p3c"

NS

2 record(s)
ns1.ignum.com.
ns2.ignum.cz.

SOA

1 record(s)
ns1.ignum.com. hostmaster.ignum.cz. 2026073102 10800 3600 604800 3600

CAA

0 record(s)
—

Not configured

DS

1 record(s)
1478 13 2 470201C4952A833A4C2B18D20E7E22FE8BE54CE27677C76EDAD8644E 0E22AE98

DNSKEY

2 record(s)
256 3 13 gB+euHP2bil7a58BF2WaNvSCnRcloJihHEqHTJCLwt9eYMMwPW3CY7yj iBTL5kFVNHWoZMQvaIK8RbY49HEeqQ==
257 3 13 iwSBRNKahrDDjqGMErIG6vv59dDkT4Em1maTym1rj3fpFNYrSqu6Bdsz 9GmshtPdFMhfVry8mp22CCQc1X3QBg==

RRSIG

4 record(s)
AAAA 13 2 600 20260929121903 20260731111903 6760 coi.cz. m91kBtntDSqjPv5qHOvnwUNDmnQzD9UOd9uHv2pQhe56i4z/6uq9BAV6 dT6S9jevOPhvU87uqL1/nbKVM0VlyA==
NS 13 2 3600 20260929121903 20260731111903 6760 coi.cz. OlleitH+/+dv0zldmdDASouyKtYZ+qW+VrlmEMNf6yuTQ9VSbis/Ecny zXycXs84ocxtUFfePtep6Yy0LTqBdw==
A 13 2 600 20260929121903 20260731111903 6760 coi.cz. 1HnQdT7nFTjwQrmhU/5ZNVb6OEvfSXQP3z7lgcVLmIyfnX8ThnJkG0UV vKCjmd/vC4sAg60MbcZf7KKyXM3Zgw==
DS 13 2 3600 20260823054724 20260809041724 5166 cz. yLxEVRDTJnI3bbeoao+yU3vIyRBluWKuJjfNXvYZ91eMGyjjFjheNpu+ 10gUcx7QWDS6MeiwtEEywZyr03l6EQ==

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

Configured
v=spf1 a mx ip4:213.195.199.180 ip4:213.195.199.179 include:spf.protection.outlook.com -all

DMARC

Configured
v=DMARC1; p=quarantine; rua=mailto:dmarc@coi.cz; ruf=mailto:dmarc@coi.cz; fo=1

DKIM

Selector selector1
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAt2faxCFWwkhRQrLgxLvzFZ1tdB7F6KMhDGSjwoiW/u9Wo8qo/HZibOeezpxWhGOsG5IbTKE54Vc4R6bzsrNr5x4Yk8dU/X2wT1Z7qrRbjyGqp/ZaaRS8BZ3Jai0eU9u8yEeyAfGqri5Fb1tmqFKnJ6ha32dy8Cib90vcZfuz2NL/GJ+D57iNGG2zTS153e58LKiNgtD4wzBvnxHOanBawvJsn9V+SSVMo5kwpmUwhMqv0xgqEljruUZ/ZLH0aNlmGuySwWpuM2Rq0bVOvz2zm/scHUrsk/7b3rePeiPvJZKiSZ8PiLkXyEcuMCymrVqi21Qlj/Iu598hi8XvX1FQIQIDAQAB;

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
ČOI – Česká obchodní inspekce kontroluje a dozoruje právnické a fyzické osoby prodávající nebo dodávající výrobky a zboží na vnitřní trh, poskytující služby nebo vyvíjející jinou podobnou činnost na vnitřním trhu, poskytující spotřebitelský úvěr nebo provozující tržiště (tržnice) pokud podle zvláštních právních předpisů nevykonává dozor jiný správní úřad.
Description
Final URL
https://coi.gov.cz/
HTTP status
206

HTTP

Status
HTTP/1.1 200 OK
Final URL
https://coi.gov.cz/
Version
2
Server
Apache
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Let's Encrypt
CN
coi.cz
Valid from
2026-07-25T03:07:51-05:00
Valid until
2026-10-23T03:07:50-05:00
Days remaining
72
Protocol
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384

Security headers

5 active
✓
HSTSImplemented
✓
Content Security PolicyImplemented
✓
X-Content-Type-OptionsImplemented
✓
X-Frame-OptionsImplemented
✓
Referrer PolicyImplemented
—
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
104.155.16.79
324,83 ms
Cloudflare
1.1.1.1
104.155.16.79
389,40 ms
Quad9
9.9.9.9
104.155.16.79
381,68 ms
OpenDNS
208.67.222.222
104.155.16.79
700,15 ms
AdGuard
94.140.14.14
104.155.16.79
568,11 ms

IP, geolocation and ASNAssociated network information

104.155.16.79

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

coi-cz.o-v1.mx.microsoft

Port 25: Closed/unreachable - 21.7 ms - 
Port 465: Closed/unreachable - 4017.1 ms - 
Port 587: Closed/unreachable - 4011 ms -

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