DV SSL/TLS Certificate for zu.ub.uni-freiburg.de

Certificate is witin its validity period

Issued by Let's Encrypt (R11)

About the zu.ub.uni-freiburg.de DV SSL/TLS Certificate

This certificate with serial number 05:1d:0a:bd:c3:10:fe:6e:0b:47:f6:43:03:53:cc:8c:7b:26 for zu.ub.uni-freiburg.de was issued on by Let's Encrypt.

With 2 subject alternative names, this certificate can be used to secure multiple FQDNs. This DV SSL/TLS Certificate is currently within its validity period but we haven't checked the revocation status of this certificate, you can do this simply on revocationcheck.com. We have found some issues with the compliance of this certificate, they are be shown below. We hope this DV SSL/TLS Certificate review for zu.ub.uni-freiburg.de provides you with the detailed information you were looking for.


We have identified some issues with this certificate:
  • Subscriber certificates use of Subject Key Identifier is NOT RECOMMENDED (BRs v2: 7.1.2.7.6)
  • Subscriber Certificate: commonName is NOT RECOMMENDED. (BRs: 7.1.2.7.1)

Let's Encrypt

Organization: Let's Encrypt
Country: US

This X.509 certificate will expire on

Certificate Details

Serial Number (hex): 05:1d:0a:bd:c3:10:fe:6e:0b:47:f6:43:03:53:cc:8c:7b:26
Serial Number (int): 445443895879988826454620427961884325215014
Serial Number Length: 139 bits, 18 octets

Subject Key Identifier: b9:1f:4a:c0:d9:8c:89:06:c7:d1:21:07:9e:3e:7b:7f:49:46:30:c7
Authority Key Identifier: c5:cf:46:a4:ea:f4:c3:c0:7a:6c:95:c4:2d:b0:5e:92:2f:26:e3:b9

Fingerprint (SHA-1): 6f:a7:fa:9c:eb:d3:a6:68:5e:46:d2:b1:4f:db:54:17:d4:0f:9b:95
Fingerprint (SHA-256): 7d:f9:c7:1e:b1:12:a7:aa:60:e7:a0:da:53:11:fe:12:65:75:88:31:1f:76:29:dc:87:e6:ce:a2:0c:ca:55:81

Issuing Certificate URL: http://r11.i.lencr.org/

Revocation Information

CRL Distribution Point: http://r11.c.lencr.org/39.crl

Check the revocation status for certificate zu.ub.uni-freiburg.de
2
DNS Names
0
Email Addresses
0
IP Addresses

Advanced Certificate Properties

Technical details of the X.509 certificate for zu.ub.uni-freiburg.de

Public Key Algorithm
RSA
Key Size
2048
Signature Algorithm
SHA256 with RSA
Key Usage
Key Encipherment
Digital Signature
Extended Key Usages
Server Authentication
Client Authentication
Extensions
10
CA Certificate
This is not a CA certificate

Subject Alternative Names

X.509 Certificate

The complete raw X.509 certificate details for zu.ub.uni-freiburg.de in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEArMhjWnY402rBUDhTPN9f
LJZ3+4nbrKLluL1fm2XK+vp2dAJNf/64hBwsZJZ2mSQ8B42CGJLj55rRG2Nk2W26
juQnThX02S2UV6Hj68wb/zjlFfcwfwmKuf8Hd36+aRutOeVDkSMlvf4TlSzITSzv
1A5Veoaa9VVrHkW+4VJgRYpQaQxjJ1jH6rrb6rrJOf7sthH1Xvei1kRXkF+zk4jM
7rRLOC9xybaXlrrg1MFyJuqJeEbhIf9mITFpM2mSAxFnyLUkFFRCxXFrfcQe8rsW
4zI1jCKeN2WxhXL2+R2pq75g826FmW2bc+cmv21Aq3xaAJeOW89rxzwm+UcAN3Bi
KwIDAQAB
-----END PUBLIC KEY-----

ASN.1 Decoded

 [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . [c:2|t:0|true] OtherName 
 . . . . . . . . . . . . [c:0|t:2|false] INTEGER 2
 . . . . . . . . [c:0|t:2|false] INTEGER 445443895879988826454620427961884325215014
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11
 . . . . . . . . . . . . [c:0|t:5|false] NULL []
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.6
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'US'
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.10
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Let's Encrypt'
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'R11'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2025-06-21 02:07:11 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2025-09-19 02:07:10 +0000 UTC
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'zu.ub.uni-freiburg.de'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.1
 . . . . . . . . . . . . . . . . [c:0|t:5|false] NULL []
 . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (2160 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 21811803508709694471383954551494604145341630147603393823412528816873817861898510760760182627372264036202465832015704019192711952951783934640516931729323291667364480791672578073128546023893742921915629796449051105158211939208045641837692321227367648857079339507170952884458241119219435091897146557654441276567134653086590117782647572897290415225451323525499708966105225312503915663870209681381071137566224044447299258089366160510604690834311628222733912891186769698253344069403984085546649891527938556457359461173184979308044721916511969095984831179379761258445014953912038374284951655644144584296131169476108251849259
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 65537

 . . . . . . . . [c:2|t:3|true] ORAddress 
 . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.15
 . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (4 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (3 bits)
							05a0
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.37
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.1
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.2
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.19
 . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (2 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.14
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (20 bytes)
							b91f4ac0d98c8906c7d121079e3e7b7f494630c7
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.35
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName c5cf46a4eaf4c3c07a6c95c42db05e922f26e3b9
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.1.1
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (39 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.2
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://r11.i.lencr.org/'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.17
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (56 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'storage.zu.ub.uni-freiburg.de'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'zu.ub.uni-freiburg.de'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.32
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (12 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.23.140.1.2.1
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.31
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (39 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://r11.c.lencr.org/39.crl'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.11129.2.4.2
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f00077007d591e12e1782a7b1c61677c5efdf8d0875c14a04e959eb9032fd90e8c2e79b8000001979072f0ba0000040300483046022100b31d52ebfb23271a0e6d5480f058f92940146331309a426163cdc20644fe8cc1022100ef7b974f10d9546e4c8e82a8021949971d87a1b9eb9fd522142e3dc5e4b97b45007500ccfb0f6a85710965fe959b53cee9b27c22e9855c0d978db6a97e54c0fe4c0db0000001979072f0ca0000040300463044022009072035b2ba80013b38409a3efcf67512a12d33eef6cd03fe9ec8f4729b7cc0022020fa05c85fb8b7389cac359586a0577a55926520c6f129ea364a72ac02134300
 . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11
 . . . . . . . . [c:0|t:5|false] NULL []
 . . . . [c:0|t:3|false] BIT STRING (2048 bits)
		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