contactbook.app

Issued by R3

About this certificate

This digital certificate with serial number 04:2e:09:50:be:d3:4b:ca:c8:4a:cf:6c:53:77:b3:80:59:12 was issued on by Let's Encrypt.

This certificate has already expired and will cause a warning or error message in the browser it's still listed on this site to allow you to look back on previously issued certificates. If we have found any compliance issues with this certificate they will be shown below. I hope this certificate review is providing you the detailed information in a simple form you where looking for.


We have idenified some issues with this certificate:
  • DV certificate contains a subject common name, this is not recommended. If certificate policy 2.23.140.1.2.1 (CA/B BR domain validated) is included, only country and/or common name is allowed in SubjectDN. (BRs: 7.1.2.7.2)
  • 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)

Certificate Subject

CN=contactbook.app

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:2e:09:50:be:d3:4b:ca:c8:4a:cf:6c:53:77:b3:80:59:12
Serial Number (int): 364114514911513326443809867521124477196562
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 30:57:9c:5e:8e:2b:e4:5c:82:dd:a8:87:b2:d1:02:ab:84:91:3a:b5
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 9a:e2:af:c3:55:55:d2:6f:e1:5e:7a:a2:ad:d9:c3:b1:23:a0:38:53
Fingerprint (sha256): 6f:a7:7c:40:29:0c:aa:94:01:18:11:95:4c:e5:a6:0f:57:e7:51:fa:89:05:98:ca:8d:9c:b0:cd:82:2a:4e:3a

Issuing Certificate URL: http://r3.i.lencr.org/

Revocation information

OCSP Server: http://r3.o.lencr.org

Check the revocation status for certificate contactbook.app

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for contactbook.app

Public Key Algorithm

RSA

Key Size

2048

Signature Algorithm

SHA256 with RSA

Key Usage

Digital Signature
Key Encipherment

Extended Key Usages

Server Authentication
Client Authentication

Extensions

9 extensions
No unhandled critical extensions

CA Certificate

This is not a CA certificate

Subject Alternative Names

contactbook.app

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contactbook.app

Certificate

The complete raw certificate details for contactbook.app in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxEIgYgyw4VUPTuTCvvO6
tVudf0yUDPW7oc67ch3/echwtWSoeWn4WXJMkX//97G+7huJBv9SU9QnavqWOE7j
VEobzh/l4aEpsdKHpOEmDwkA6C+EoZjcYQafpQz0YCtBW/2w7GIGOLMMu6fBJslq
CJMmeAqfSrcjNoEC8IQUsxGdIDWY+QM8yzj+zMUzeTrW8thHHi48+rVbTcx/63t+
8OhMldEwCCW65ufpnk++BHXwneWc8xMLuvnr+MQWHQuyD8C8KU8do/TdYPUk9Tik
AppePgYFmMsh+w4UdF8ho5VjYzx7eoQc7e7q8/DbtNE0PgXUG4DnIfeksn4hi56/
fQIDAQAB
-----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 364114514911513326443809867521124477196562
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11 (sha256WithRSAEncryption)
 . . . . . . . . . . . . [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 (countryName)
 . . . . . . . . . . . . . . . . . . . . [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 (organizationName)
 . . . . . . . . . . . . . . . . . . . . [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 (commonName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'R3'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-01-02 08:12:18 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-04-01 08:12:17 +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 (commonName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'contactbook.app'
 . . . . . . . . [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 (rsaEncryption)
 . . . . . . . . . . . . . . . . [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 24775315963907066376078236336046074218325965379893757544733744762037734715009273164969583879085839456714027247680561008593355814376586366938229314184904563134577082791156962323323491858797362107446170195074181826762289393205513975638167010109992892145964065294336478834483168920105951928870599113862955749565771859185680766350237537548234329699739897759513779561372998727922518201971868062334251726597647730571553421065637004237222642478476758420235639307739513190700886936163919048633146390069650521603128127983543846418744699463585952313803375557329765615041902411269780939989212491817523707036574596410596487249789
 . . . . . . . . . . . . . . . . . . . . [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 (keyUsage)
 . . . . . . . . . . . . . . . . . . . . [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 (extKeyUsage)
 . . . . . . . . . . . . . . . . . . . . [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 (serverAuth)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.2 (clientAuth)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.19 (basicConstraints)
 . . . . . . . . . . . . . . . . . . . . [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 (subjectKeyIdentifier)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (20 bytes)
							30579c5e8e2be45c82dda887b2d102ab84913ab5
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.35 (authorityKeyIdentifier)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName 142eb317b75856cbae500940e61faf9d8b14c2c6
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.1.1 (authorityInfoAccess)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (73 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.1 (ocsp)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://r3.o.lencr.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.2 (caIssuers)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://r3.i.lencr.org/'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.17 (subjectAltName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (19 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'contactbook.app'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.32 (certificatePolicies)
 . . . . . . . . . . . . . . . . . . . . [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 (Domain Validation Certificates Policy)
 . . . . . . . . . . . . . . . . [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)
							00f0007600a2e2bfd61ede2f2f07a0d64e6d37a7dc6543b0c6b52ea2dab78af89a6df517d80000018cc971f6c6000004030047304502204fb78dc29b43d9d582fe159a352708e04a5523d1695a992c1c424618c6efdc01022100f2050b2eab1e7bd424f7c5d8372f6b0bc8298e29197ab799927dd927cf5e398e007600eecdd064d5db1acec55cb79db4cd13a23287467cbcecdec351485946711fb59b0000018cc971f6c70000040300473045022017f8298b078f2417e81bbecea26b95d1cab5de1a32e617dae7f0e116334486560221009c46801f3728b4c0792c2a183d3ae85278fbdeb6832444cb27a5c755de8009a0
 . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11 (sha256WithRSAEncryption)
 . . . . . . . . [c:0|t:5|false] NULL 
 . . . . [c:0|t:3|false] BIT STRING (2048 bits)
		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