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82
Total
70
DNS
70
Email
81
Security
100
Network
100
Availability
Domainopensource.com
IPv42
IPv62
MX records2
StatusActive
Domain technical report

Opensource.com

opensource.com

Generated: 2026-08-09T07:10:37-05:00 · Cached result

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IPv42
IPv62
MX2
NS4

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

2 IPv4 address(es) detected.

✓
IPv6 (AAAA)10 / 10 pts · Dns

2 IPv6 address(es) detected.

✓
Name server redundancy20 / 20 pts · Dns

4 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 propagation0 / 10 pts · Dns

Agreement between public resolvers.

✓
MX records20 / 20 pts · Mail

2 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

115 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: a23-200-156-7.deploy.static.akamaitechnologies.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

2 record(s)
23.200.156.7
23.200.156.15

AAAA

2 record(s)
2600:1407:3c00:a::1740:7019
2600:1407:3c00:a::1740:7008

CNAME

0 record(s)
—

Not configured

MX

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

TXT

2 record(s)
"v=spf1 mx ip4:66.187.233.33 ip4:66.187.233.34 ip4:209.132.183.28 include:_netblocks.eloqua.com include:us._netblocks.mimecast.com -all"
"google-site-verification=X28eGinKFncUAc3Z2eE3MPs3JPzYsfmhC2HNu78IY-8"

NS

4 record(s)
dns3.p01.nsone.net.
dns2.p01.nsone.net.
dns1.p01.nsone.net.
dns4.p01.nsone.net.

SOA

1 record(s)
dns1.p01.nsone.net. hostmaster.nsone.net. 1669627888 200 7200 1209600 3600

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 mx ip4:66.187.233.33 ip4:66.187.233.34 ip4:209.132.183.28 include:_netblocks.eloqua.com include:us._netblocks.mimecast.com -all

DMARC

Configured
v=DMARC1; p=reject; rua=mailto:dmarc-rua@redhat.com; sp=none; ri=86400

DKIM

Not found
—

Not configured

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
Opensource.com
Description
Final URL
https://opensource.com/
HTTP status
206

HTTP

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

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
DigiCert Inc
CN
prod2.redhat.com
Valid from
2026-05-17T19:00:00-05:00
Valid until
2026-12-02T17:59:59-06:00
Days remaining
115
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

Review
!
Differences detected

5 public resolvers queried.

ResolverServerResultLatency
Google
8.8.8.8
23.211.124.204, 23.211.124.206
47,98 ms
Cloudflare
1.1.1.1
23.200.156.15, 23.200.156.7
42,22 ms
Quad9
9.9.9.9
23.211.124.204, 23.211.124.206
102,27 ms
OpenDNS
208.67.222.222
23.200.156.15, 23.200.156.7
53,82 ms
AdGuard
94.140.14.14
23.33.40.68, 23.33.40.72
45,97 ms

IP, geolocation and ASNAssociated network information

23.200.156.7

No data
success
No
country
region
city
asn
organization
isp

23.200.156.15

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.redhat.com

Port 25: Closed/unreachable - 7.9 ms - 
Port 465: Closed/unreachable - 85.4 ms - 
Port 587: Closed/unreachable - 4029.9 ms -

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