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80
Total
85
DNS
45
Email
81
Security
100
Network
100
Availability
Domaincentos.org
IPv43
IPv63
MX records1
StatusActive
Domain technical report

The CentOS Project

centos.org

Generated: 2026-08-08T19:28:30-05:00 · Cached result

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IPv43
IPv63
MX1
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

1 MX record(s).

✓
SPF25 / 25 pts · Mail

SPF policy published.

!
DMARC0 / 25 pts · Mail

DMARC policy not found.

!
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

80 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers16 / 35 pts · Security

4 of 9 evaluated headers detected.

✓
PTR reverse DNS30 / 30 pts · Network

PTR: ip-81.171.33.202.centos.org

✓
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/1.1 200 OK

✓
HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

3 record(s)
81.171.33.202
81.171.33.201
52.56.83.118

AAAA

3 record(s)
2a05:d01c:c6a:cc02:225e:ab54:d58c:8b14
2001:4de0:aaae::201
2001:4de0:aaae::202

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
10 mail.centos.org.

TXT

3 record(s)
"google-site-verification=xFWz31gRBrIYS5zOQLeT6oY88Z2UPuW031lo3iGaXBI"
"v=spf1 mx ip4:8.43.84.214 ip4:8.43.84.213 ip6:2620:52:3::214" "ip4:8.43.84.199 ip4:8.43.84.213 ip6:2620:52:3::214 ip4:8.43.84.214 ip4:38.145.33.27 ip6:2620:52:6:2111::47 -all"
"libera-1239sd9"

NS

2 record(s)
ns2.centos.org.
ns1.centos.org.

SOA

1 record(s)
ns1.centos.org. hostmaster.centos.org. 2026072801 28800 7200 2400000 3600

CAA

5 record(s)
0 issuewild "letsencrypt.org"
0 issue "digicert.com"
0 issue "letsencrypt.org"
0 issuewild "digicert.com"
0 issue "amazon.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

Configured
v=spf1 mx ip4:8.43.84.214 ip4:8.43.84.213 ip6:2620:52:3::214ip4:8.43.84.199 ip4:8.43.84.213 ip6:2620:52:3::214 ip4:8.43.84.214 ip4:38.145.33.27 ip6:2620:52:6:2111::47 -all

DMARC

Not configured
—

Not configured

DKIM

Not found
—

Not configured

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
The CentOS Project
Description
Final URL
https://centos.org/
HTTP status
206

HTTP

Status
HTTP/1.1 200 OK
Final URL
https://centos.org/
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
centos.org
Valid from
2026-07-30T03:01:14-05:00
Valid until
2026-10-28T03:01:13-05:00
Days remaining
80
Protocol
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384

Security headers

4 active
✓
HSTSImplemented
—
Content Security PolicyNot detected
✓
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
52.56.83.118, 81.171.33.201, 81.171.33.202
34,61 ms
Cloudflare
1.1.1.1
52.56.83.118, 81.171.33.201, 81.171.33.202
36,26 ms
Quad9
9.9.9.9
52.56.83.118, 81.171.33.201, 81.171.33.202
26,12 ms
OpenDNS
208.67.222.222
52.56.83.118, 81.171.33.201, 81.171.33.202
56,16 ms
AdGuard
94.140.14.14
52.56.83.118, 81.171.33.201, 81.171.33.202
235,90 ms

IP, geolocation and ASNAssociated network information

81.171.33.202

No data
success
No
country
region
city
asn
organization
isp

81.171.33.201

No data
success
No
country
region
city
asn
organization
isp

52.56.83.118

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

mail.centos.org

Port 25: Closed/unreachable - 19.2 ms - 
Port 465: Closed/unreachable - 4037.8 ms - 
Port 587: Closed/unreachable - 4036 ms -

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