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72
Total
85
DNS
40
Email
96
Security
70
Network
60
Availability
Domainlinux.org
IPv43
IPv63
MX records2
StatusActive
Domain technical report

Just a moment...

linux.org

Generated: 2026-08-09T01:04:39-05:00 · Cached result

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IPv43
IPv63
MX2
NS2

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

3 IPv4 address(es) detected.

✓
IPv6 (AAAA)10 / 10 pts · Dns

3 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 chain0 / 15 pts · Dns

Both DS and DNSKEY are required.

✓
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).

!
SPF0 / 25 pts · Mail

SPF policy not found.

!
DMARC0 / 25 pts · Mail

DMARC policy not found.

✓
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

35 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers31 / 35 pts · Security

8 of 9 evaluated headers detected.

!
PTR reverse DNS0 / 30 pts · Network

PTR not detected.

✓
IPv4 diversity35 / 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 response0 / 40 pts · Availability

HTTP/2 403

✓
HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

3 record(s)
104.26.14.72
104.26.15.72
172.67.73.26

AAAA

3 record(s)
2606:4700:20::ac43:491a
2606:4700:20::681a:e48
2606:4700:20::681a:f48

CNAME

0 record(s)
—

Not configured

MX

2 record(s)
10 mx1.improvmx.com.
20 mx2.improvmx.com.

TXT

1 record(s)
"ahrefs-site-verification_631032cd30b4e19d3273793b1c65f11c66f6a5426ba38536b9d58ef0dc91054d"

NS

2 record(s)
mark.ns.cloudflare.com.
lia.ns.cloudflare.com.

SOA

1 record(s)
lia.ns.cloudflare.com. dns.cloudflare.com. 2411439456 10000 2400 604800 1800

CAA

10 record(s)
0 issuewild "ssl.com"
0 issue "pki.goog; cansignhttpexchanges=yes"
0 issuewild "digicert.com; cansignhttpexchanges=yes"
0 issue "digicert.com; cansignhttpexchanges=yes"
0 issuewild "pki.goog; cansignhttpexchanges=yes"
0 issuewild "comodoca.com"
0 issue "letsencrypt.org"
0 issue "comodoca.com"
0 issuewild "letsencrypt.org"
0 issue "ssl.com"

DS

0 record(s)
—

Not configured

DNSKEY

0 record(s)
—

Not configured

RRSIG

0 record(s)
—

Not configured

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

Selector s1
k=rsa; t=s; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAufsQVKXnOnbdijzTg67f1e5db0V6sbrcSjcHVgaTXQtMPhyUv3Rh15r6WBO9kdCp8c662vysjEGEf8FLPeK54ueD8g8lOprw+cJnkgm8HXDVTOQs8IuXKmZvlvciYESNJUTVURPxLRDhMsUfhwpw/eAi4tFIH1tJ/2iZ3jmA1TH/UiHGbzQXEWczypuc3xj6YqM12VZR3pyKBWvjZmFSnZA+x6fXRqnV9AZvcZLielUFwL1RAq3IJhgqUfGvOD0CWTkgFKnqtIuZH0Sj96rFJ9PdXGiamqYlnMjGyITJHc4zfkg0t/t0L9qtpA0qCFTrgdv1Av/YZ7q8dAPXisWM3wIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
Just a moment...
Description
Final URL
https://linux.org/
HTTP status
403

HTTP

Status
HTTP/2 403
Final URL
https://linux.org/
Version
3
Server
cloudflare
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Google Trust Services
CN
linux.org
Valid from
2026-06-15T03:02:49-05:00
Valid until
2026-09-13T04:02:37-05:00
Days remaining
35
Protocol
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384

Security headers

8 active
—
HSTSNot detected
✓
Content Security PolicyImplemented
✓
X-Content-Type-OptionsImplemented
✓
X-Frame-OptionsImplemented
✓
Referrer PolicyImplemented
✓
Permissions PolicyImplemented
✓
Cross-Origin-Opener-PolicyImplemented
✓
Cross-Origin-Embedder-PolicyImplemented
✓
Cross-Origin-Resource-PolicyImplemented

DNS propagationComparison across public resolvers

Public resolver comparison

Consistent
✓
Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency
Google
8.8.8.8
104.26.14.72, 104.26.15.72, 172.67.73.26
52,53 ms
Cloudflare
1.1.1.1
104.26.14.72, 104.26.15.72, 172.67.73.26
18,57 ms
Quad9
9.9.9.9
104.26.14.72, 104.26.15.72, 172.67.73.26
45,81 ms
OpenDNS
208.67.222.222
104.26.14.72, 104.26.15.72, 172.67.73.26
29,19 ms
AdGuard
94.140.14.14
104.26.14.72, 104.26.15.72, 172.67.73.26
136,87 ms

IP, geolocation and ASNAssociated network information

104.26.14.72

No data
success
No
country
region
city
asn
organization
isp

104.26.15.72

No data
success
No
country
region
city
asn
organization
isp

172.67.73.26

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

mx1.improvmx.com

Port 25: Closed/unreachable - 4 ms - 
Port 465: Closed/unreachable - 98.5 ms - 
Port 587: Closed/unreachable - 101.3 ms - 220 mx1.improvmx.com Welcome to ImprovMX mail server v3. - ImprovMX v2026.08.07

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