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83
Total
85
DNS
70
Email
77
Security
85
Network
100
Availability
Domaingnu.org
IPv41
IPv61
MX records1
StatusActive
Domain technical report

The GNU Operating System and the Free Software Movement

gnu.org

Since 1983, developing the free Unix style operating system GNU, so that computer users can have the freedom to share and improve the software they use.

Generated: 2026-08-08T17:13:35-05:00 · Cached result

JSONCSVPDFVisit site
IPv41
IPv61
MX1
NS3

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

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

59 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers12 / 35 pts · Security

3 of 9 evaluated headers detected.

✓
PTR reverse DNS30 / 30 pts · Network

PTR: 116.0-24.188.51.209.in-addr.arpa

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/1.1 200 OK

✓
HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

1 record(s)
209.51.188.116

AAAA

1 record(s)
2001:470:142:5::116

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
10 eggs.gnu.org.

TXT

1 record(s)
"v=spf1 ip4:209.51.188.0/24 ip6:2001:470:142::/48 ip4:18.4.89.21 ip4:15.204.209.91 ip6:2604:2dc0:101:200::1d07 -all"

NS

3 record(s)
ns4.gnu.org.
ns2.gnu.org.
ns1.gnu.org.

SOA

1 record(s)
ns1.gnu.org. hostmaster.gnu.org. 2026071501 3600 120 1209600 3600

CAA

1 record(s)
0 issue "letsencrypt.org"

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

1 record(s)
1 1 A2B0FA94793B921FC7A835A313CE8557F8D989E1

SPF

Configured
v=spf1 ip4:209.51.188.0/24 ip6:2001:470:142::/48 ip4:18.4.89.21 ip4:15.204.209.91 ip6:2604:2dc0:101:200::1d07 -all

DMARC

Configured
v=DMARC1; p=none; rua=mailto:dmarc-rua@fsf.org

DKIM

Not found
—

Not configured

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
The GNU Operating System and the Free Software Movement
Description
Since 1983, developing the free Unix style operating system GNU, so that computer users can have the freedom to share and improve the software they use.
Final URL
https://www.gnu.org/
HTTP status
206

HTTP

Status
HTTP/1.1 200 OK
Final URL
https://www.gnu.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
wildebeest1p.gnu.org
Valid from
2026-07-09T05:16:20-05:00
Valid until
2026-10-07T05:16:19-05:00
Days remaining
59
Protocol
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384

Security headers

3 active
✓
HSTSImplemented
—
Content Security PolicyNot detected
✓
X-Content-Type-OptionsImplemented
✓
X-Frame-OptionsImplemented
—
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
209.51.188.116
62,36 ms
Cloudflare
1.1.1.1
209.51.188.116
43,81 ms
Quad9
9.9.9.9
209.51.188.116
36,53 ms
OpenDNS
208.67.222.222
209.51.188.116
51,06 ms
AdGuard
94.140.14.14
209.51.188.116
129,67 ms

IP, geolocation and ASNAssociated network information

209.51.188.116

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

eggs.gnu.org

Port 25: Closed/unreachable - 26.7 ms - 
Port 465: Closed/unreachable - 4045.2 ms - 
Port 587: Closed/unreachable - 31.4 ms - 220 eggs.gnu.org ESMTP Exim 4.90_1 Ubuntu Sat, 08 Aug 2026 18:13:35 -0400

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