contactbook.app

Issued by R3

About this certificate

This digital certificate with serial number 04:e1:ae:fb:5c:74:84:de:f0:6f:28:a3:76:82:ed:9f:64:a5 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:e1:ae:fb:5c:74:84:de:f0:6f:28:a3:76:82:ed:9f:64:a5
Serial Number (int): 425245267097243480395230095221476619674789
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 5f:d9:c3:68:0c:46:d4:cb:69:63:12:d2:f9:c7:63:b9:92:80:53:05
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 25:26:e8:f3:d9:51:9c:97:63:b6:05:e4:7e:79:77:37:88:15:fe:c9
Fingerprint (sha256): b9:e2:06:b7:e5:51:ba:7f:6b:4c:dd:0b:70:c8:de:ba:34:00:bc:12:bd:d7:95:a1:54:cc:0a:d8:d4:24:75:28

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-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAq+qt44mPENk9LY7rFBaC
aJ5BHPbOlPyODm79Z+TnPJO91MyJisHtVxsyUzZICqX/BQMTbXP8WaCKum0alNt2
RBcG2dbTrmDBlhS1YU7PcmLMZzKLEPKlMGzqqJdoUNh8siZsPWXAfkFoTLsM+ltK
owf9w3wHqtEWGe7TwjKndp0SWlxpGdhDlhVDdN/otZB1QVegEJlH8BoIQVJxpPAd
VxlfLw1F0NDuaqjjJRstYJN8bpEWG8Tjyq14N20EkrYcV/PzjKpTUdvYKSYqjH5t
XZopBmK9ALwPRs8s92IozKzKMgcIwEIeiqW4DIeHQcH4JsSIQhmLCc8xMKtDWiTb
rQIDAQAB
-----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 425245267097243480395230095221476619674789
 . . . . . . . . [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 2024-03-20 09:16:00 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-06-18 09:15:59 +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 21702474802062994481637880375025627298656809021851193359413314036135167964373434236937687000941544367627001915921367085264103438561282985601650313021557426313104227930489759937362340105667219285753939185574706899232820091176405837259912208832598721693316921975385687407045250017060763229023762806424158453824523560441031389144380110543351511415257527577085313870349840248348781077933823432800815992393707222434004333983929125739319990146560764009046197009527061335675031213184449381221192353334789233219885360177064036013936980220990411532259973057866514979385621579227838531997126804725653714504416732527043272825773
 . . . . . . . . . . . . . . . . . . . . [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)
							5fd9c3680c46d4cb696312d2f9c763b992805305
 . . . . . . . . . . . . . . . . [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 (246 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes)
							00f100760048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018e5b5c512500000403004730450220704495414ebe18787685fee8977c19cbdfac9a88966a50c00188e0bdf1c489aa022100e4314bf9c290cce4533851c2b61c98d00c7f54098f20f22b6bdc3306552aeb1b007700eecdd064d5db1acec55cb79db4cd13a23287467cbcecdec351485946711fb59b0000018e5b5c513f00000403004830460221008dbcbf58093a55bb7e6284692162ac45e7fb06f335c60f360dd79a88b055b756022100c1f877aa30d7b7d969c58b74459930a46362d4ebb1a7acf12e824e4bb10e256c
 . . . . [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)
		004792a93ec0b0539061ebbcee8fba18a314608e932ed229d078be6a98769d928e7541f7293c2dfd65e580c27a2d49a5701ec75903cebda1d435a56f924fe17320e7e33f170f930ff0e5b304a4b1bbcd674893fddf44e1c89b3ec714906f37ee577bb0280a9f581831a359944b502caf7e6707ac14077a3906e532166d7a38b1f593a0053c43ad39523185c05bd523ce98e9d0c650cbcf37cbef3f6ea955c612c860f307008d0cddf3b8f1c52965d0859294d4d753a0d1e8dc0caf03bf23c63b0f7b7e078b3b551cab8c9eb14ffcc57f454269bb953a0add95786909b55db119ef3889291ab76ffb36d04d417633dae6a4f0720a7a9b00f3d61424b09fffe1e241