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Total

DNS

Email

Security

100

Network

100

Availability

Domainubuntu.com

IPv43

IPv63

MX records1

StatusActive

Domain technical report

Enterprise Open Source and Linux | Ubuntu

ubuntu.com

Ubuntu is the modern, open source operating system on Linux for the enterprise server, desktop, cloud, and IoT.

Generated: 2026-08-08T17:46:42-05:00 · Cached result

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IPv43

IPv63

MX1

NS3

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

3 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

1 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

52 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers31 / 35 pts · Security

8 of 9 evaluated headers detected.

✓

PTR reverse DNS30 / 30 pts · Network

PTR: website-content-cache-3.ps5.canonical.com

✓

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 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

3 record(s)

185.125.190.29
185.125.190.21
185.125.190.20

AAAA

3 record(s)

2620:2d:4000:1::27
2620:2d:4000:1::26
2620:2d:4000:1::28

CNAME

0 record(s)

—

Not configured

MX

1 record(s)

10 mx.ubuntu.com.

TXT

3 record(s)

"v=spf1 include:_spf.canonical.com include:spf.forwardemail.net ~all"
"forward-email-site-verification=6IsURgl2t7"
"google-site-verification=8CcvY6fsgRbiFk2nyEaiA9rE-ykXOcWUPjJKlO6P4vk"

NS

3 record(s)

ns3.canonical.com.
ns2.canonical.com.
ns1.canonical.com.

SOA

1 record(s)

ns1.canonical.com. hostmaster.canonical.com. 2018065908 10800 3600 604800 3600

CAA

6 record(s)

0 issue "digicert.com"
0 issuewild "letsencrypt.org"
0 iodef "mailto:is-admin@canonical.com"
0 issue "letsencrypt.org"
0 issuewild "digicert.com"
0 issue "letsencrypt.org; accounturi=https://acme-v01.api.letsencrypt.org/acme/reg/32541290"

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.canonical.com include:spf.forwardemail.net ~all

DMARC

Configured

v=DMARC1; p=none; pct=100; rua=mailto:dmarc-rua+ubuntu@admin.canonical.com

DKIM

Not found

—

Not configured

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

Enterprise Open Source and Linux | Ubuntu

Description

Ubuntu is the modern, open source operating system on Linux for the enterprise server, desktop, cloud, and IoT.

Final URL

https://ubuntu.com/

HTTP status

206

HTTP

Status

HTTP/2 200

Final URL

https://ubuntu.com/

Version

Server

nginx/1.14.0 (Ubuntu)

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Let's Encrypt

ubuntu.com

Valid from

2026-07-01T23:13:36-05:00

Valid until

2026-09-29T23:13:35-05:00

Days remaining

Protocol

TLSv1.3

Cipher

TLS_AES_256_GCM_SHA384

Security headers

8 active

✓

HSTSImplemented

✓

Content Security PolicyImplemented

✓

X-Content-Type-OptionsImplemented

—

X-Frame-OptionsNot detected

✓

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

185.125.190.20, 185.125.190.21, 185.125.190.29

25,17 ms

Cloudflare

1.1.1.1

185.125.190.20, 185.125.190.21, 185.125.190.29

19,28 ms

Quad9

9.9.9.9

185.125.190.20, 185.125.190.21, 185.125.190.29

23,59 ms

OpenDNS

208.67.222.222

185.125.190.20, 185.125.190.21, 185.125.190.29

25,38 ms

AdGuard

94.140.14.14

185.125.190.20, 185.125.190.21, 185.125.190.29

126,04 ms

IP, geolocation and ASNAssociated network information

185.125.190.29

No data

success

country

region

city

asn

organization

isp

185.125.190.21

No data

success

country

region

city

asn

organization

isp

185.125.190.20

No data

success

country

region

city

asn

organization

isp

Visitor information

Visitor

216.73.217.62

reverse

country

country_code

region

city

latitude

longitude

isp

organization

asn

timezone

browser

Other

language

user_agent

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

is_bot

Yes

cloudflare

SMTPEmail port connectivity

mx.ubuntu.com

Port 25: Closed/unreachable - 94.5 ms - 
Port 465: Closed/unreachable - 4004.5 ms - 
Port 587: Closed/unreachable - 4114.5 ms -

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