contactbook.app

Issued by R3

About this certificate

This digital certificate with serial number 04:b8:a3:94:53:25:bb:fd:8e:5e:8c:02:18:06:89:77:24:fa 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:
  • Subscriber Certificate: commonName is deprecated. (BRs: 7.1.4.2.2)

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:b8:a3:94:53:25:bb:fd:8e:5e:8c:02:18:06:89:77:24:fa
Serial Number (int): 411278533550171287649034371712424074487034
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: c0:b1:05:02:e5:ff:ae:65:78:89:e6:1b:95:65:5b:16:ad:d6:34:4e
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 7d:9b:7b:c3:07:3f:a7:10:3d:e3:72:ec:dc:df:9d:3b:1b:2f:51:82
Fingerprint (sha256): 73:4e:1a:bc:0c:1e:a2:00:cd:a9:35:98:e2:26:2b:97:13:d9:2a:30:d1:72:1f:68:01:26:20:17:8a:f2:f0:f4

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-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA01DyLs/vEIhxNnJYsUZj
DTQRAQwfjF6t4X8fPoQ+uH0SIWPbwzMSkXSJMzALCEGM1PIdIKYb5Qkrormic/9G
UgIFMYLESsEp9K2zqvp9bx7MWCMecZhEAMIpslSGDSqph5HiAVufHOvbterXGcRY
6RCJUGCqUxwSkX87eVWFuk3cnXaxVc8MB6AMVosTglpEth7i5Ez6HCDvdKeikUpj
i0g/mHyOvqr9lyOBwY08nqy51pSxcW8M5X7W41bE8v8WAu0eF25afw8RWBxnq8kw
9AcdN+Z1PUAnEJag8iseV3qm2Erg1r7prWMBEF8CGJADxtJ3gnLmUZOVW2rbmlsm
TwIDAQAB
-----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 411278533550171287649034371712424074487034
 . . . . . . . . [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 2023-07-30 06:13:04 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-10-28 06:13:03 +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 26676198321341227947837694306555054950186635642083270038103008309821010034104209215004372580006332505412822818004116042122902653084439049837809288742566689757029170982188359746101115602006323689228371014567278763546151540507710512787288447165241509710572702489518315862145879556951297772088565345931405996446133355816953855728411386022719236760748190197772994714013541115649756867153998933780801977448062859424571982576332919088103211629102068877834305583994339085096081362038240959327441564962280894279856152661774562163194182224541104019953922613864477302115473312731085794227459551275483893381798853371855552325199
 . . . . . . . . . . . . . . . . . . . . [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)
							c0b10502e5ffae657889e61b95655b16add6344e
 . . . . . . . . . . . . . . . . [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 (243 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (240 bytes)
							00ee007500b73efb24df9c4dba75f239c5ba58f46c5dfc42cf7a9f35c49e1d098125edb49900000189a5a4bda90000040300463044022048f62ae72642e423f9824d12d5d32c2960916da76f164e786bfcf6e9d8b07dd20220467cc68772f130a6101069812332a5f700b55527531f54986485c2b495e4bbf50075007a328c54d8b72db620ea38e0521ee98416703213854d3bd22bc13a57a352eb5200000189a5a4bdc6000004030046304402203ce3be1d55518ed1ef86734066a847d2643a0eb0c66677774ebebfc8349fe5d302205e789391c558bade93a828dd4a78881789c983e69fa41e33467c689d3ea2c97a
 . . . . [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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