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85
Total
85
DNS
90
Email
65
Security
100
Network
100
Availability
Domainxubuntu.org
IPv44
IPv64
MX records1
StatusActive
Domain technical report

Xubuntu

xubuntu.org

Generated: 2026-08-12T09:57:25-05:00 · Cached result

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IPv44
IPv64
MX1
NS3

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

4 IPv4 address(es) detected.

✓
IPv6 (AAAA)10 / 10 pts · Dns

4 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.

✓
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

65 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

!
HTTP security headers0 / 35 pts · Security

0 of 9 evaluated headers detected.

✓
PTR reverse DNS30 / 30 pts · Network

PTR: cdn-185-199-108-153.github.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

4 record(s)
185.199.108.153
185.199.109.153
185.199.111.153
185.199.110.153

AAAA

4 record(s)
2606:50c0:8000::153
2606:50c0:8001::153
2606:50c0:8002::153
2606:50c0:8003::153

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
0 .

TXT

1 record(s)
"v=spf1 -all"

NS

3 record(s)
ns1.canonical.com.
ns3.canonical.com.
ns2.canonical.com.

SOA

1 record(s)
ns1.canonical.com. hostmaster.canonical.com. 2018022372 10800 3600 604800 3600

CAA

6 record(s)
0 issuewild "letsencrypt.org"
0 iodef "mailto:is-admin@canonical.com"
0 issuewild "digicert.com"
0 issue "digicert.com"
0 issue "letsencrypt.org"
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 -all

DMARC

Configured
v=DMARC1;p=reject;sp=reject;adkim=s;aspf=s;fo=1;rua=mailto:dmarc-rua-misc@admin.canonical.com

DKIM

Selector x
v=DKIM1; p=

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
Xubuntu
Description
Final URL
https://xubuntu.org/
HTTP status
206

HTTP

Status
HTTP/2 200
Final URL
https://xubuntu.org/
Version
3
Server
GitHub.com
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Let's Encrypt
CN
xubuntu.org
Valid from
2026-07-18T19:42:51-05:00
Valid until
2026-10-16T19:42:50-05:00
Days remaining
65
Protocol
TLSv1.3
Cipher
TLS_AES_128_GCM_SHA256

Security headers

0 active
—
HSTSNot detected
—
Content Security PolicyNot detected
—
X-Content-Type-OptionsNot detected
—
X-Frame-OptionsNot detected
—
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

Consistent
✓
Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency
Google
8.8.8.8
185.199.108.153, 185.199.109.153, 185.199.110.153, 185.199.111.153
162,16 ms
Cloudflare
1.1.1.1
185.199.108.153, 185.199.109.153, 185.199.110.153, 185.199.111.153
246,73 ms
Quad9
9.9.9.9
185.199.108.153, 185.199.109.153, 185.199.110.153, 185.199.111.153
149,22 ms
OpenDNS
208.67.222.222
185.199.108.153, 185.199.109.153, 185.199.110.153, 185.199.111.153
159,68 ms
AdGuard
94.140.14.14
185.199.108.153, 185.199.109.153, 185.199.110.153, 185.199.111.153
217,72 ms

IP, geolocation and ASNAssociated network information

185.199.108.153

No data
success
No
country
region
city
asn
organization
isp

185.199.109.153

No data
success
No
country
region
city
asn
organization
isp

185.199.111.153

No data
success
No
country
region
city
asn
organization
isp

185.199.110.153

No data
success
No
country
region
city
asn
organization
isp

Visitor information

Visitor
ip
216.73.216.212
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

xubuntu.org

Port 25: Closed/unreachable - 0.9 ms - 
Port 465: Closed/unreachable - 4020.7 ms - 
Port 587: Closed/unreachable - 4018.9 ms -

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