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81
Total
85
DNS
70
Email
69
Security
85
Network
100
Availability
Domainfsf.org
IPv41
IPv61
MX records1
StatusActive
Domain technical report

Front Page — Free Software Foundation — working together for free software

fsf.org

Generated: 2026-08-08T21:56:42-05:00 · Cached result

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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

61 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers4 / 35 pts · Security

1 of 9 evaluated headers detected.

✓
PTR reverse DNS30 / 30 pts · Network

PTR: 174.0-24.188.51.209.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/1.0 200 OK

✓
HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

1 record(s)
209.51.188.174

AAAA

1 record(s)
2001:470:142:4::a

CNAME

0 record(s)
—

Not configured

MX

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

TXT

2 record(s)
"libera-asq123s"
"v=spf1 redirect=gnu.org"

NS

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

SOA

1 record(s)
ns1.gnu.org. hostmaster.gnu.org. 2941144492 3600 300 3600000 3600

CAA

2 record(s)
0 issue "letsencrypt.org"
0 issuewild "letsencrypt.org"

DS

0 record(s)
—

Not configured

DNSKEY

2 record(s)
256 3 7 AwEAAaKmaup94I5tpOKEpIwA3kdvIqZEJyv8tnDLw5zbwOLoupjbaAMF pnDvzvF+v0UBoI3yBYac7tdcC1TDnHoAwWpQmEm7bfYeq4PIGhM09cXE TgXi7AMq4lgQUjZiyq985oYkLG6IdNN8NQEMW0IcLKeSRvaiOGW3Tl33 Bn+h4iirIcEFpHpb0Pbf7GJ5rYKKOr/TAzx70BSIY5YZ3taz9LqUl404 RH9n6XA29soLWM36aSkrf0Ua7SSUCR+i1ekfpNe9/1GMLd1nt03ycC9Y 3N1gKawa5LPofZDb/3SuWUWIgPJnjRaWasyaGZC6xJEv0qy0Xl9witrT Vf6yf2/txsE=
257 3 7 AwEAAbELjf5AXWfGyijCwcr7igTE6xfJYXR2x5UCYp7is7rU6ANPWCGB 9LROAPt8gH5Ufx2sGdYx6SYjQozssM/az/zSO3uDj/8zGVeLwaHuJdF8 VcgFMxcUnS9IVacmPa2sX+RwGMgJKwOYCDVh+3AOFrKOXz6dZVRTkIMs nhC5vRHVDnUYbdFMwKlN5bqi1TY8lw9399fyebNKZu9oeOUseJWO/vS9 GTahzjcWbkBONpN2ioK5VuWIvLs/3d7PVB/wY3HjlDupG6AfbWCHPYh3 eL06Mqb4RC0yzFYC18WlRcidgbwIveMNzGDcHd11gNdeZRJbuDFmEvTg 9rfS7o0+Q0kDJDVHb1JEmbRe/8wsiX7WwCnWYok97CFdPXV/VnQWsJ+y YpLa8JSvYyuws1oEi6LnQX2vQ6rgznIWx/p2DKRbsY2hJa08vPL9jUIg /oXAUX4ANBb+ug4/4WqDdxQPoTDDiGFEB4U4/7iwA3iavwLzU/7G6fGl g0A1vqwg5lzVtFDHe7FO5JIxEB0K1HaLV/oikvWZ0L/ph+uD9J2tO1Xv bZNfokKsdCBWswKuKjGoMbLrPOsWeUdIttDNdMHm1VW4qgOAqqoL3im2 Xrfebj/7/E4O9GJHflvyyF/li+Yks/HKIDxDFyPpQYypubvqnNXKgFbn GvcoIMQUqACg+zKR

RRSIG

11 record(s)
DNSKEY 7 2 180 20270731165314 20260731165314 6719 fsf.org. YhMjPMP9C3C9wDsNNBmn0uhzDWd73M9rk31FVgypC34W4+AvHE8jwWSF VK7Kds+Xb59Yp9jPWXg4pddYFVbZ9MGWqaQoS/LR2ThMIGaPxlOpewRw ClNpWdJNCdV4kyL2oaSCZlGyIo0Kz6ZCJW3DQSQin+ay90tfLxmpfsfa Y6sHd4nBKiuCsT4lKwxbMmSOQ1nyH93Ihwk2zGAxeet1wFUX8ekmXBaO doIpCR5KWpThFsghSeAmv+75vZOGbA26EQJ9HTv0eCVt5oIxjvAuOEJ5 WSN6ONeFmsCK1IcLuvprSpjs/qDeHwcK1PVlHotE6QjZA3bwP1i7J0fn hmp2WA==
DNSKEY 7 2 180 20270731165314 20260731165314 57078 fsf.org. CV2uEbWSHYgPDd6VNYIQJ+eCZ5FEJyQLhqLRgSOyyNSsiuu3dW8/BEn1 MhI2wjWH6mdIvmdtSD+tc1WQoNjbjBCFBAPZJ8yuU75QUpfzGxnAYiw4 ClkJiqEnxSbJJIn/Z1RhedEjalY8/4XBI/oWulI686Yz9gdP/xTxuhkA DJKe3QTejG/EMoJOK7O/H6q1GGcQG8zOTRPQ7SSeAchlgUvp/x9/Qhul 1dxYk9jguR9M+EXODgnEyaW0E3Ux26chWxBm1IL+OeFcMICIIdkn8qi3 n03GFDcfp0JAmmn/QlHeVvd/lagces2NG+xbYPCtwTBse3s4Yjxs6gUx 8CbwVV1DbG/W1AfLgIKJV/LTBc+mWtOidVdAM1pYUjN0GE+sdeFt8n9z UVkQ4x2PpodW9fsmtnWBnwgVUrBT0SqC/3b3p0ihtbNgxkfh/d2uGn26 xwTTHRcIVDeHnPNAh34SuhaShEE3dawygQrBi4VsaASFfC/nj0iIQkt2 wZ+I5J+wxUEJBkHI8YUmkc9lVbrdfSpbxdoLFJgD64k+lnU1ytDmaid0 wj89punp32ystIVJna8+c6drBc/ImWNuCZ5spMyLe6eeB1wmvR4fScZt 08KzFPk0WLjEyTUVL+AD9UYAq2eFJXheRNRou13UEm91Ull0+BwXZRlb tAkuFGUaKnY=
NSEC 7 2 180 20270731165314 20260731165314 6719 fsf.org. N5qyIEzHpkO9qek3C+hM292ISXk60JN7/LYPF+/fnjmvVviPVowiqpXn eG5fs5G2w/Oqk0Vk+sw09yT7pFo4kk5+xuE4SuPh7KIsxiWSc9LpLiEs SdN2CN78pmd4efNiFVygE+BFlTIWmfoxZvCiN1H7FuxEGsY3ooegkpLX 0nKUZOL79HG2guWLLiDtxt/aPNoNryAto5wT/F7UwMxEa3mNZJB440OC 2QBHMyu5ZMNsDPG97nF5BiztiHhF6MzLm1NfuT6btX+YAgb5Fpl5L9IJ eAvQCN27hwJ0aQYPdwbE7SYf9/AHfEepxCo1mdezMOtzRQPS7FtWAAVu X+JINQ==
MX 7 2 180 20270731165314 20260731165314 6719 fsf.org. YUxav/IkZcVGIBo+M6y51jfRyXOa2I3snPSUvftJjwZm+K8/2oz1gmuY gIlPSFj+ChFRWpg5w9fhZBzTzsiSygg8tSV9N0L+p5zPCPHe9VjW33oJ UgVeuRark2vAzbqe7mgZPl1yiqXzrhcKXEqBGlC9Zm7yoHUau9lW4gu1 rsAsfKMXeaKtPrSrq+4A35gHWFlMe3o/u9Bgi1JLlPHdkoIQ9RPlba3H gNATgULRBHsMrAKezdBX7y7NzNyXnogEAw+wqBiC8jSYpbEu79gYPh2i KksMdDDLFFHpBcUNVKv1mEw7Z7MvuOWIrNq9XOpuxAQvjUC/bXDit2pL Be559w==
A 7 2 180 20270731165314 20260731165314 6719 fsf.org. WOgWYvZ46i7YT04RRqNqoBYcuBbLJoJgvb8e3udfv/l5puyYLhG2PTji +qfFpZeUUbDwcT8EqFyO4Zr0JT7KdK05SFXRZH3NOYI6lEvxyNjBFL1j 9tSbMLHVAb+JTiKmA26LpfUDcBMz3Xkt5rg/u/qbj7yAGKP6g+5+/Fkz qWcgBo8zpU3rsd6PSHZjXLXoZIvFeAG6iJCMDKMdqMZqcUqCI0WJm95C Jaxi7YUJ1jSkptdlSdeo1NG3SO3rxphkw+qv+ijmch6xLO5Rh9xXPEuL BO10GpGdz6Ybt9Ik52GLAP7o0TDP+1z5MgpAZ6tr242saQayUmy/2pqT DxM79g==
NS 7 2 180 20270731165314 20260731165314 6719 fsf.org. KIfGUvLifUErmcNTtjLIEvHwfi/KRKcIuahAb76bBHCYArQS0W/tpPQu C+LCsMV49cjoYHfpc68Cd94+7ulwJd/rhW2zNCaXnjQYy7HXByE84z7L XmYyQXRQekMizEKt3kgIDpHFbZzIl8aVQbAQEtlZHcwr27bce9hMfrq9 kswLBQ4tXtLMO9U0N0sE73BDu0Wh60Q4Vo+OP+KIsav6SZei8QMyV2XO hjMtHiQOtGeFF3+1daWJlgaKxAHKEaP5qFsk4uBkZb66ClTlagmAh6AF JRVCqr4oO9+s5wUraJK2tZMqcxo4DP+dfKjG78vB/wAMVE21B5vL7YvK yV4YCg==
SOA 7 2 180 20270731165314 20260731165314 6719 fsf.org. BANo7wDfuO/dKOcsYuL+hXJ95ArtOGYqEyF8iWXo4SLaxv5ebylRvYiQ 5FCvI3PKas9zQdi+GZe+dKnOcXvRQKi9KF57f1K2YQmxcsvQwLHZMzWt cDX7OZfSZ0GUqXRN2NF3Wc0zABqxBoqIVD3ExZ3u7eyZ+cY23rfTKnrl KStOZXxN/vE+HVHeMeSh8PSm5nclEACMmCywhDn9r5HBJqw/16u1FL0g bUKT02XNWqd+SmQ+zx/47gZa0Pa6FHCs7bKp+qqIswVt9bOG6mIV/Leh SHEosJHvcyFeyuYYCKo0JvUIGIMN1Itb6z3LvSjNvhmXi+K4GMEkhwPq AgJPzw==
TXT 7 2 180 20270731165314 20260731165314 6719 fsf.org. WyQgm+ibjx+owt4sBRjt5khyq6VOsMpX1zABE8oQR7HSF0nFwMc+JOJ5 G6btJyzvH2NttHaxqJ3pxZoUc44DhP3QxBVc9GpLizYVSrNodQdUIPBS b/ElVbarQbJqlavFJ1PuR1XqDlaz/sUgd/2l8OIk9LahS3BAsUMNZH4Z mC5jPEnUvROo84Jx0jS8fqRB+80Zp2grK9dfpy8YsPPxyik6/Sw7W0Ko USF4lMSLZUUso24mPi6LUbqInXMpI1WUimcAq0Hs+SaO2IZf9gShuClK fg9fquazlgBNrw25DB718WOK10GuGbt9ikNmHh1v2UdZ//3hIN9ILZBj gxvp/w==
AAAA 7 2 180 20270731165314 20260731165314 6719 fsf.org. L6rzMwDZgFAENIL8JzHiFVmOVPfubfzZ7yMUQKrheTVIGm85C6KT0mm4 ytIqsJFImkEOnSOS/RitKyF7bzVua+15eewiz8AKNvniaG4PX+pOh2MR y9Z86wfIt1frhV5gNHCnGFOTMgkjO1AcCL7IZbOwayimDH9BfSQXa+pw o72WEc9QGu8LvFq/ebtuHKmwLzfRBUh5beS6lGOVsATfH7ZN1qvdQ7Em S5q88sdD+Z8SByRkViVOTVYqWoyTBJ5oXM/uvZBRyjOvUZAwCyrz+pge z9to7kyrHNRnwFFHs1PQlbRCfWLL+FrzcaQMrEk9cSRNS7cmWVq9ZUGt gAHLsQ==
CAA 7 2 180 20270731165314 20260731165314 6719 fsf.org. bMOc3Rsvy2clg+c2DleepjrohAViqeUPTF/cOATDpYVPxFRNWilyFPks MvOZ6koAbFFJrD6U95wVEydmEk9bnlJVOVRI4RjEk/OiQzYTUG/iBobS TbJOkQAdf0AkW+gZfILYm8J/431eSLJD4lVX/765wD0dVcsZcUTucnKP CipY5lfz+IxCNcvFhDMSxowkMW6v2xUczlrdfgdfXPRwraLsu3+OEz99 wr4n8SMi6nBBRqG0GRL8HyHdajrFtjCpVOx/W3uXbulTwrxgSJFOTnk5 xyMrtWFw/eU5q5a8hSvQj9HzwzU4QaT+C23tRkLCg5EJO+rG4+43xjVM aizuSg==
SSHFP 7 2 180 20270731165314 20260731165314 6719 fsf.org. mslSkoJpDOAAZ/aoNNNW+WUAucnv8Rw33tOWUUzTnceHrJWXBH/UXFgl ZPtrqqrx7P0t5GgzgUPFWit8CKgxqOAbYwGyLS5fZVJEZW25pk5ZNBLq D79i1NykvOWwtrr1PcTvznGfbFugjM3lxAE5Gr2AbYXSvw7gQD0CGFq1 2yM6DN3I4dYR9G4TSwVS141fd5wpRXiuiV8f+xm4yJRSQNoimR6f+8n7 S6XLdXNAWXPDGbT9H+a2EnqO/6WcQMX/Joef63l1SSK2sbpF0OB3ZJJd 2iGCdo+zrEbq/B0cxFmz2EVtqBR6Uxt/Tlq99tUs2lixnV8UXLdDHkE8 m12i6Q==

NSEC

1 record(s)
20121109-crm.fsf.org. A NS SOA MX TXT AAAA SSHFP RRSIG NSEC DNSKEY CAA

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 DC991327D1B7B418F14CE737B934AA56C389E688

SPF

Configured
v=spf1 redirect=gnu.org

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
Front Page — Free Software Foundation — working together for free software
Description
Final URL
https://www.fsf.org/
HTTP status
206

HTTP

Status
HTTP/1.0 200 OK
Final URL
https://www.fsf.org/
Version
1
Server
nginx
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Let's Encrypt
CN
*.fsf.org
Valid from
2026-07-11T14:23:55-05:00
Valid until
2026-10-09T14:23:54-05:00
Days remaining
61
Protocol
TLSv1.2
Cipher
DHE-RSA-AES128-GCM-SHA256

Security headers

1 active
—
HSTSNot detected
—
Content Security PolicyNot detected
✓
X-Content-Type-OptionsImplemented
—
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
209.51.188.174
163,25 ms
Cloudflare
1.1.1.1
209.51.188.174
159,09 ms
Quad9
9.9.9.9
209.51.188.174
236,77 ms
OpenDNS
208.67.222.222
209.51.188.174
160,51 ms
AdGuard
94.140.14.14
209.51.188.174
40,54 ms

IP, geolocation and ASNAssociated network information

209.51.188.174

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.fsf.org

Port 25: Closed/unreachable - 25.9 ms - 
Port 465: Closed/unreachable - 4020.8 ms - 
Port 587: Closed/unreachable - 58.1 ms - 220 mail.fsf.org ESMTP Exim 4.93 Ubuntu Sat, 08 Aug 2026 22:56:41 -0400

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