contactbook.app

Issued by R3

About this certificate

This digital certificate with serial number 03:fb:75:1f:12:cd:47:52:ac:2d:72:91:9f:1a:33:86:e4:8c 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): 03:fb:75:1f:12:cd:47:52:ac:2d:72:91:9f:1a:33:86:e4:8c
Serial Number (int): 346903412910492963567819129673032367793292
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 0b:4c:c5:46:f2:3b:a9:2a:a0:24:e6:8e:3b:13:3c:f5:45:7a:3d:46
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): be:61:f8:a7:78:28:60:1d:6c:7d:46:15:6e:51:15:03:9d:4d:41:51
Fingerprint (sha256): 6f:94:5b:2f:62:39:e8:a2:cb:70:32:43:25:0f:5a:0e:21:f0:3f:21:4b:77:c8:2f:f2:9e:cc:f7:ca:57:89:38

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-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAucgrtoLCHjKIe9GfEdbF
a3Ih2LJcRypnTS1eC/ji8RrvrOeeQKgvVAbnoLjbDWf8h138P+BlR5JEBUO1VF0q
eImPqaRDw4FOo3i1LVtir1kCmxVHktqESwT7BwwL0HS0FALGU9p2B5ScV8ueAdpl
HiFFwbru7aGaK575li+i35aShYZaNKWtWxKepcTvewDaKbwrqLnAMlzEkFHB5kRw
7VQCgfNsHaP+T/372mSOAhVaqir1ZAmqrOjCAiP1ODd0/Je6Gliqu32uC0aCy1bb
G2yZDvDlLa8XeJyZ/h2MO4MOPMEDhN8PLUPk26HUT/S4HIB01im9R3oe9DrPsuJ6
bQIDAQAB
-----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 346903412910492963567819129673032367793292
 . . . . . . . . [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 2022-04-17 23:12:37 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2022-07-16 23:12:36 +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 23452794296235386358127788490579932731233307093108014392994793107571989616123048402665489012270282379365585563125740897727751463914849912642350403577668578112752764906770549511751895052687950614268747393017521676333027072940477906688564414060353765502262529041238569781286165225798307311639248740952627823155073918409189614925113602688208763713466410206513272909144695445382393962264155663983725414356571796299978665469186115983479092401067443942839116382290919510880652981726285125079921599547878298311193769876089456640570267139564921029493227450600803966798825948637163274123926746914870948817755553263996431923821
 . . . . . . . . . . . . . . . . . . . . [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)
							0b4cc546f23ba92aa024e68e3b133cf5457a3d46
 . . . . . . . . . . . . . . . . [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 (69 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 1.3.6.1.4.1.44947.1.1.1
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.2.1 (cps)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:22|false] IA5String 'http://cps.letsencrypt.org'
 . . . . . . . . . . . . . . . . [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)
							00f000760046a555eb75fa912030b5a28969f4f37d112c4174befd49b885abf2fc70fe6d47000001803a03a06500000403004730450220558bc8375457a52b4209e81166bf982dd1a97ad78c0e6157e8b0ff374bbc229e0221008a17ca42a3aea34dfc85e17b161847bc086f7657341fee7a55a33e594f679abf007600dfa55eab68824f1f6cadeeb85f4e3e5aeacda212a46a5e8e3b12c020445c2a73000001803a03a2320000040300473045022100a68e077081efbebc54613954c067f95f4aaca726a19bcaba00798967bf54ae26022005137aa4952a1f4095d3538f569bfadd69b6c81048e60561092bb5eaa061379b
 . . . . [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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