4d2.su: 4d2 dot org Security Status (Beta)
==========================================

About this application - click to show
The problem: We've recently seen privacy-oriented services come under attack in several ways, from legislative saber-rattling like the EU's Chat Control initiative to an extremely concerning Man-in-the-Middle TLS attack where major hosting companies likely cooperated with law enforcement to violate the privacy of jabber.ru users.

In the jabber.ru attack, hosting companies used their privileged network position to obtain phony TLS certificates for jabber.ru services. These were then secretly used to create an intermediate termination point for secure traffic. Users and site admins saw that connections were encrypted, but communication was presumably being decrypted and funneled elsewhere. This continued for months before it was noticed.

How we're defending ourselves: We already take industry standard precautions such as publishing restrictive CAA records. On this page we try to close some remaining gaps by testing the validity of our own certificates using as many mutually uncooperative parties as possible. This doesn't do anything to prevent an attack, but it makes it as difficult as possible for a MitM attack against us to go unnoticed. Here's how it works: This is not absolute protection from an impersonation attack, or anything close. It just tries to make such an attack as inconvenient, expensive and obvious as possible.

Install our Proof of Security Client for automated monitoring from a machine you trust.
Service NameLocal FingerprintFingerprint to ClientLocal ExpiryExpiry to ClientLE Account IDTrust?
4d2.link
40:51:41:12:52:54:E8:5CD7:E1:05:62:AF:3F:80:23:F1:FF:DE:9D:5B:7F:8E:C4:33:B3:6F:8D:3E:1D:22:F9:40:51:41:12:52:54:E8:5C
40:51:41:12:52:54:E8:5CD7:E1:05:62:AF:3F:80:23:F1:FF:DE:9D:5B:7F:8E:C4:33:B3:6F:8D:3E:1D:22:F9:40:51:41:12:52:54:E8:5C
May 1 22:11:16 2025Jan 31 22:11:17 2025 - May 1 22:11:16 2025
May 1 22:11:16 2025Jan 31 22:11:17 2025 - May 1 22:11:16 2025
76782206https://acme-v02.api.letsencrypt.org/acme/acct/76782206
OK
4d2.org
DF:BF:CD:2F:46:6D:3A:0692:B2:BA:79:E8:63:45:B1:9B:62:AE:D5:C8:EA:10:3C:E9:C0:A1:8D:71:DA:D2:47:DF:BF:CD:2F:46:6D:3A:06
DF:BF:CD:2F:46:6D:3A:0692:B2:BA:79:E8:63:45:B1:9B:62:AE:D5:C8:EA:10:3C:E9:C0:A1:8D:71:DA:D2:47:DF:BF:CD:2F:46:6D:3A:06
Apr 27 02:44:08 2025Jan 27 02:44:09 2025 - Apr 27 02:44:08 2025
Apr 27 02:44:08 2025Jan 27 02:44:09 2025 - Apr 27 02:44:08 2025
76782206https://acme-v02.api.letsencrypt.org/acme/acct/76782206
OK
4d2.social
77:BD:FA:00:E0:71:84:7955:16:2D:A8:7B:8F:22:2E:25:EF:24:46:5F:78:EB:FE:AE:7B:D5:0E:84:E8:ED:5A:77:BD:FA:00:E0:71:84:79
77:BD:FA:00:E0:71:84:7955:16:2D:A8:7B:8F:22:2E:25:EF:24:46:5F:78:EB:FE:AE:7B:D5:0E:84:E8:ED:5A:77:BD:FA:00:E0:71:84:79
Jun 14 03:02:21 2025Mar 16 03:02:22 2025 - Jun 14 03:02:21 2025
Jun 14 03:02:21 2025Mar 16 03:02:22 2025 - Jun 14 03:02:21 2025
1801268617https://acme-v02.api.letsencrypt.org/acme/acct/1801268617
OK
4d2.su
A1:A4:98:E1:49:06:F2:B096:EE:53:83:70:0A:AB:B1:DB:94:B1:DD:AA:72:02:9E:A4:88:1A:E2:CB:DF:1C:41:A1:A4:98:E1:49:06:F2:B0
Verify this manuallyCheck cert details in your browser - Verify this SHA-256 fingerprint manually
Apr 13 19:11:34 2025Jan 13 19:11:35 2025 - Apr 13 19:11:34 2025
Verify this manuallyCheck cert details in your browser - Verify this manually
2014851357https://acme-v02.api.letsencrypt.org/acme/acct/2014851357
ImplicitThis server can't attest for itself
bayard.4d2.org
DF:BF:CD:2F:46:6D:3A:0692:B2:BA:79:E8:63:45:B1:9B:62:AE:D5:C8:EA:10:3C:E9:C0:A1:8D:71:DA:D2:47:DF:BF:CD:2F:46:6D:3A:06
DF:BF:CD:2F:46:6D:3A:0692:B2:BA:79:E8:63:45:B1:9B:62:AE:D5:C8:EA:10:3C:E9:C0:A1:8D:71:DA:D2:47:DF:BF:CD:2F:46:6D:3A:06
Apr 27 02:44:08 2025Jan 27 02:44:09 2025 - Apr 27 02:44:08 2025
Apr 27 02:44:08 2025Jan 27 02:44:09 2025 - Apr 27 02:44:08 2025
76782206https://acme-v02.api.letsencrypt.org/acme/acct/76782206
OK
bbs.4d2.org
29:25:FF:46:4B:80:44:7579:01:7F:F1:E3:10:43:E0:58:7E:32:19:B0:71:D3:72:71:38:80:1D:3F:03:5C:57:29:25:FF:46:4B:80:44:75
29:25:FF:46:4B:80:44:7579:01:7F:F1:E3:10:43:E0:58:7E:32:19:B0:71:D3:72:71:38:80:1D:3F:03:5C:57:29:25:FF:46:4B:80:44:75
Jun 25 02:49:37 2025Mar 27 02:49:38 2025 - Jun 25 02:49:37 2025
Jun 25 02:49:37 2025Mar 27 02:49:38 2025 - Jun 25 02:49:37 2025
2077936547https://acme-v02.api.letsencrypt.org/acme/acct/2077936547
OK
cinny.4d2.org
AE:C7:A2:82:C6:4C:BD:F300:A7:FC:2F:A9:C7:50:CD:11:D1:D0:A7:D4:FA:C7:CB:61:22:96:16:82:C5:90:CE:AE:C7:A2:82:C6:4C:BD:F3
AE:C7:A2:82:C6:4C:BD:F300:A7:FC:2F:A9:C7:50:CD:11:D1:D0:A7:D4:FA:C7:CB:61:22:96:16:82:C5:90:CE:AE:C7:A2:82:C6:4C:BD:F3
Jun 21 20:57:27 2025Mar 23 20:57:28 2025 - Jun 21 20:57:27 2025
Jun 21 20:57:27 2025Mar 23 20:57:28 2025 - Jun 21 20:57:27 2025
1434949786https://acme-v02.api.letsencrypt.org/acme/acct/1434949786
OK
depot.4d2.org
1E:5B:A7:B1:C8:3C:FC:0CD6:BF:EE:12:07:45:8C:0F:22:C1:E7:CF:05:FA:BF:EC:2B:AF:4D:AC:7F:FE:73:EF:1E:5B:A7:B1:C8:3C:FC:0C
1E:5B:A7:B1:C8:3C:FC:0CD6:BF:EE:12:07:45:8C:0F:22:C1:E7:CF:05:FA:BF:EC:2B:AF:4D:AC:7F:FE:73:EF:1E:5B:A7:B1:C8:3C:FC:0C
Jun 14 02:35:41 2025Mar 16 02:35:42 2025 - Jun 14 02:35:41 2025
Jun 14 02:35:41 2025Mar 16 02:35:42 2025 - Jun 14 02:35:41 2025
1914608496https://acme-v02.api.letsencrypt.org/acme/acct/1914608496
OK
element.4d2.org
09:41:22:B4:23:24:F3:6709:00:4D:21:43:D7:41:0F:71:5B:E1:44:02:FC:1E:9C:ED:D7:22:D9:1C:DF:D6:8B:09:41:22:B4:23:24:F3:67
09:41:22:B4:23:24:F3:6709:00:4D:21:43:D7:41:0F:71:5B:E1:44:02:FC:1E:9C:ED:D7:22:D9:1C:DF:D6:8B:09:41:22:B4:23:24:F3:67
Jun 21 20:57:12 2025Mar 23 20:57:13 2025 - Jun 21 20:57:12 2025
Jun 21 20:57:12 2025Mar 23 20:57:13 2025 - Jun 21 20:57:12 2025
1434949786https://acme-v02.api.letsencrypt.org/acme/acct/1434949786
OK
jitsi.4d2.org
AC:BC:FD:7B:EA:38:EB:E83E:90:E6:DC:FB:7B:F9:54:6C:9B:2B:96:B9:59:80:F5:CC:9D:75:B9:33:2A:1E:0C:AC:BC:FD:7B:EA:38:EB:E8
AC:BC:FD:7B:EA:38:EB:E83E:90:E6:DC:FB:7B:F9:54:6C:9B:2B:96:B9:59:80:F5:CC:9D:75:B9:33:2A:1E:0C:AC:BC:FD:7B:EA:38:EB:E8
Jun 21 20:57:03 2025Mar 23 20:57:04 2025 - Jun 21 20:57:03 2025
Jun 21 20:57:03 2025Mar 23 20:57:04 2025 - Jun 21 20:57:03 2025
1434949786https://acme-v02.api.letsencrypt.org/acme/acct/1434949786
OK
lemmy.4d2.org
CC:BC:89:FF:2D:FC:32:5F61:DD:33:AC:6D:51:05:E0:23:0B:64:52:AD:EE:51:8A:19:E1:96:D1:F8:EF:4C:98:CC:BC:89:FF:2D:FC:32:5F
CC:BC:89:FF:2D:FC:32:5F61:DD:33:AC:6D:51:05:E0:23:0B:64:52:AD:EE:51:8A:19:E1:96:D1:F8:EF:4C:98:CC:BC:89:FF:2D:FC:32:5F
Apr 25 18:16:14 2025Jan 25 18:16:15 2025 - Apr 25 18:16:14 2025
Apr 25 18:16:14 2025Jan 25 18:16:15 2025 - Apr 25 18:16:14 2025
2055798447https://acme-v02.api.letsencrypt.org/acme/acct/2055798447
OK
matrix.4d2.org
3C:C8:64:1C:63:76:3D:5A3D:A1:46:C0:F5:B5:48:8C:7A:1C:5C:88:AC:09:A5:6F:99:07:82:C5:B2:E6:74:F2:3C:C8:64:1C:63:76:3D:5A
3C:C8:64:1C:63:76:3D:5A3D:A1:46:C0:F5:B5:48:8C:7A:1C:5C:88:AC:09:A5:6F:99:07:82:C5:B2:E6:74:F2:3C:C8:64:1C:63:76:3D:5A
Jun 21 20:57:19 2025Mar 23 20:57:20 2025 - Jun 21 20:57:19 2025
Jun 21 20:57:19 2025Mar 23 20:57:20 2025 - Jun 21 20:57:19 2025
1434949786https://acme-v02.api.letsencrypt.org/acme/acct/1434949786
OK
pad.4d2.org
DF:11:81:C6:93:4B:E9:2770:AC:92:90:E8:46:89:DE:B0:F8:E3:2C:3B:8F:55:EC:3B:CB:89:E9:6E:96:06:2E:DF:11:81:C6:93:4B:E9:27
DF:11:81:C6:93:4B:E9:2770:AC:92:90:E8:46:89:DE:B0:F8:E3:2C:3B:8F:55:EC:3B:CB:89:E9:6E:96:06:2E:DF:11:81:C6:93:4B:E9:27
Jun 14 03:02:14 2025Mar 16 03:02:15 2025 - Jun 14 03:02:14 2025
Jun 14 03:02:14 2025Mar 16 03:02:15 2025 - Jun 14 03:02:14 2025
1914608496https://acme-v02.api.letsencrypt.org/acme/acct/1914608496
OK
padsbx.4d2.org
DF:11:81:C6:93:4B:E9:2770:AC:92:90:E8:46:89:DE:B0:F8:E3:2C:3B:8F:55:EC:3B:CB:89:E9:6E:96:06:2E:DF:11:81:C6:93:4B:E9:27
DF:11:81:C6:93:4B:E9:2770:AC:92:90:E8:46:89:DE:B0:F8:E3:2C:3B:8F:55:EC:3B:CB:89:E9:6E:96:06:2E:DF:11:81:C6:93:4B:E9:27
Jun 14 03:02:14 2025Mar 16 03:02:15 2025 - Jun 14 03:02:14 2025
Jun 14 03:02:14 2025Mar 16 03:02:15 2025 - Jun 14 03:02:14 2025
1914608496https://acme-v02.api.letsencrypt.org/acme/acct/1914608496
OK
vault.4d2.org
DF:BF:CD:2F:46:6D:3A:0692:B2:BA:79:E8:63:45:B1:9B:62:AE:D5:C8:EA:10:3C:E9:C0:A1:8D:71:DA:D2:47:DF:BF:CD:2F:46:6D:3A:06
DF:BF:CD:2F:46:6D:3A:0692:B2:BA:79:E8:63:45:B1:9B:62:AE:D5:C8:EA:10:3C:E9:C0:A1:8D:71:DA:D2:47:DF:BF:CD:2F:46:6D:3A:06
Apr 27 02:44:08 2025Jan 27 02:44:09 2025 - Apr 27 02:44:08 2025
Apr 27 02:44:08 2025Jan 27 02:44:09 2025 - Apr 27 02:44:08 2025
76782206https://acme-v02.api.letsencrypt.org/acme/acct/76782206
OK
video.4d2.org
CC:BC:89:FF:2D:FC:32:5F61:DD:33:AC:6D:51:05:E0:23:0B:64:52:AD:EE:51:8A:19:E1:96:D1:F8:EF:4C:98:CC:BC:89:FF:2D:FC:32:5F
CC:BC:89:FF:2D:FC:32:5F61:DD:33:AC:6D:51:05:E0:23:0B:64:52:AD:EE:51:8A:19:E1:96:D1:F8:EF:4C:98:CC:BC:89:FF:2D:FC:32:5F
Apr 25 18:16:14 2025Jan 25 18:16:15 2025 - Apr 25 18:16:14 2025
Apr 25 18:16:14 2025Jan 25 18:16:15 2025 - Apr 25 18:16:14 2025
2055798447https://acme-v02.api.letsencrypt.org/acme/acct/2055798447
OK
Last updated at Apr 01 14:00:12 2025. All times UTC.
Note that cdn.4d2.org, static.4d2.org and cdn.4d2.social are operated by our CDN vendor Bunny.net. They issue their own certificates.
These fingerprints are not shown here, and the "@" CAA records in the 4d2.org and 4d2.social zones are relaxed to allow this issuance.


Last update from arthur at Apr 01 14:00:00 2025
     Linux arthur.4d2.org 6.13.7-arch1-1 #1 SMP PREEMPT_DYNAMIC Thu, 13 Mar 2025 18:12:00 +0000 x86_64 GNU/Linux
     UUID Received: 6d88209f-96ce-4166-950e-cb4fdfddf680
     UUID Sent: Compare
Last update from bayard at Apr 01 14:00:00 2025
     FreeBSD bayard.4d2.org 14.2-RELEASE-p1 FreeBSD 14.2-RELEASE-p1 GENERIC amd64
     UUID Received: 9a41263b-0f01-11f0-968e-00163ca40e3c
     UUID Sent: Compare
Last update from marvin at Apr 01 14:00:00 2025
     Linux marvin.4d2.org 6.13.6-arch1-1 #1 SMP PREEMPT_DYNAMIC Fri, 07 Mar 2025 20:19:00 +0000 x86_64 GNU/Linux
     UUID Received: 9356ede0-bb48-45d6-a55f-09a53a5a98dc
     UUID Sent: Compare

What attacks are still possible, and how do I mitigate them?
How can I find out right away if there's a new security problem?
You can install our Proof of Security Client on a machine you own and schedule it to run regularly.

Back to 4d2 dot org