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88
Total
80
DNS
90
Email
84
Security
85
Network
100
Availability
Domainkernel.org
IPv41
IPv61
MX records3
StatusActive
Domain technical report

The Linux Kernel Archives

kernel.org

Generated: 2026-08-08T18:18:52-05:00 · Cached result

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IPv41
IPv61
MX3
NS6

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

6 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 policy0 / 5 pts · Dns

Certificate authority restriction.

✓
DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓
MX records20 / 20 pts · Mail

3 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

35 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: tor.source.kernel.org

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)
172.105.4.254

AAAA

1 record(s)
2600:3c04:e001:324:0:1991:8:25

CNAME

0 record(s)
—

Not configured

MX

3 record(s)
10 smtp2.kernel.org.
10 smtp3.kernel.org.
10 smtp1.kernel.org.

TXT

2 record(s)
"v=spf1 include:_spf.kernel.org ~all"
"google-site-verification=nb4Wx5xBQM3b-a3OV2KSlPL786714Y7M6GfBtJf1opQ"

NS

6 record(s)
ns61.constellix.net.
ns41.constellix.net.
ns21.constellix.com.
ns11.constellix.com.
ns51.constellix.net.
ns31.constellix.com.

SOA

1 record(s)
ns11.constellix.com. dns.constellix.com. 2015014898 43200 3600 1209600 180

CAA

0 record(s)
—

Not configured

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

Configured
v=spf1 include:_spf.kernel.org ~all

DMARC

Configured
v=DMARC1; p=quarantine; rua=mailto:dmarc@kernel.org

DKIM

Selector default
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDbCVavaDWYcYX16ktqY4ZiZIaYApoL4sSGBsp5mIv1X3Ocy6MvXOC8XzDCO+hXYxhpdM16GmwWSFo7IVZ14DSb2XNkfDAB0RYS67Ma1mst6xwJTrfhtnoZkKdfZB5mn1x63/KEjkHnc9vwdF/kMuWvxnbS1q0xnmdIElFJead5hQIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
The Linux Kernel Archives
Description
Final URL
https://kernel.org/
HTTP status
200

HTTP

Status
HTTP/2 200
Final URL
https://kernel.org/
Version
3
Server
nginx
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Let's Encrypt
CN
tor.source.kernel.org
Valid from
2026-06-15T14:38:51-05:00
Valid until
2026-09-13T14:38:50-05:00
Days remaining
35
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
172.105.4.254
56,67 ms
Cloudflare
1.1.1.1
172.105.4.254
42,25 ms
Quad9
9.9.9.9
172.105.4.254
56,13 ms
OpenDNS
208.67.222.222
172.105.4.254
39,34 ms
AdGuard
94.140.14.14
172.105.4.254
73,36 ms

IP, geolocation and ASNAssociated network information

172.105.4.254

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

smtp2.kernel.org

Port 25: Closed/unreachable - 8 ms - 
Port 465: Closed/unreachable - 64.6 ms - 
Port 587: Closed/unreachable - 65.1 ms - 220 smtp.kernel.org ESMTP Postfix

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