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interactivematerials.de SSL Certificate – Not trusted, expires 28 Dec 2026 | CubDomain
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interactivematerials.de
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SSL certificate
I
interactivematerials.de
SSL certificate & chain
Status
Not trusted
Expires in
61 days
Issuer
Let's Encrypt
Chain
4 certificates
Certificate chain
1 · Site certificate
Valid
ud21.udmedia.de
Issued by YR1
Expires 28 Dec 2026
→
2 · Intermediate
Valid
YR1
Issued by Root YR
Expires 2 Sept 2028
→
3 · Intermediate
Valid
Root YR
Issued by ISRG Root X1
Expires 2 Sept 2032
→
4 · Root
Valid
ISRG Root X1
Self-signed root
Expires 4 Jun 2035
Each certificate is shown in full below, from the site's own to the root.
1
Site certificate
ud21.udmedia.de
Valid
Issued to
Common name (CN)
ud21.udmedia.de
Issued by
Common name (CN)
YR1
Organisation (O)
Let's Encrypt
Country (C)
US
Validity
Valid from
29 Sept 2026, 23:18 UTC
Valid until
28 Dec 2026, 23:18 UTC
Days remaining
61
Technical details
Serial number
05:39:E2:17:0C:86:A7:A8:52:4D:E6:CD:A4:B9:92:2A:35:78
Signature algorithm
sha256RSA
Matches the domain
No
Names covered
Subject Alternative Names · 3
mail.ud21.udmedia.de
ud21.udmedia.de
www.ud21.udmedia.de
2
Intermediate
YR1
Valid
Issued to
Common name (CN)
YR1
Organisation (O)
Let's Encrypt
Country (C)
US
Issued by
Common name (CN)
Root YR
Organisation (O)
ISRG
Country (C)
US
Validity
Valid from
3 Sept 2025, 00:00 UTC
Valid until
2 Sept 2028, 23:59 UTC
Days remaining
675
Technical details
Serial number
00:A2:02:53:F1:5F:26:91:C0:5D:C1:CE:13:B9:BC:CA:4E
Signature algorithm
sha256RSA
3
Intermediate
Root YR
Valid
Issued to
Common name (CN)
Root YR
Organisation (O)
ISRG
Country (C)
US
Issued by
Common name (CN)
ISRG Root X1
Organisation (O)
Internet Security Research Group
Country (C)
US
Validity
Valid from
13 May 2026, 00:00 UTC
Valid until
2 Sept 2032, 23:59 UTC
Days remaining
2136
Technical details
Serial number
00:F2:4B:6D:17:F9:D9:AD:7C:B1:C9:FE:A7:87:82:69:9F
Signature algorithm
sha256RSA
4
Root
ISRG Root X1
Valid
Issued to
Common name (CN)
ISRG Root X1
Organisation (O)
Internet Security Research Group
Country (C)
US
Issued by
Common name (CN)
Self-signed
Organisation (O)
Internet Security Research Group
Country (C)
US
Validity
Valid from
4 Jun 2015, 11:04 UTC
Valid until
4 Jun 2035, 11:04 UTC
Days remaining
3141
Technical details
Serial number
00:82:10:CF:B0:D2:40:E3:59:44:63:E0:BB:63:82:8B:00
Signature algorithm
sha256RSA
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