69080.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:5c:2b:b7:15:0e:29:d4:10:64:eb:74:f8:a5:7c:cb:2e:c6 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=69080.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:5c:2b:b7:15:0e:29:d4:10:64:eb:74:f8:a5:7c:cb:2e:c6
Serial Number (int): 379813228904963929688097664349049409187526
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 9f:d4:98:70:0b:ca:40:25:a7:03:fb:83:0d:68:51:86:ea:3b:6d:e9
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 3d:92:1d:d4:c3:5e:7f:31:fc:9e:61:ce:bb:d1:03:8a:4e:46:c0:9f
Fingerprint (sha256): 71:4d:9b:78:15:d0:4a:be:06:c8:ea:58:c1:4b:1a:b5:c1:49:cd:b2:55:b7:7f:50:0d:0a:1f:3a:aa:10:b7:05

Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/

Revocation information

OCSP Server: http://ocsp.int-x3.letsencrypt.org

Check the revocation status for certificate 69080.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for 69080.com

Public Key Algorithm

RSA

Key Size

4096

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

69080.com

Other certificates including the domain name 69080.com

(limited to 100 certificates)
ocnn.net
34835.com
www.69080.com
69080.com
www.69080.com
www.69080.com
www.69080.com
hava.place
69080.com
www.69745.com
aardvark.world
www.69080.com
69080.com
69080.com
www.69080.com
34312.com
personalinjurylawyers.melbourne
69080.com

Certificate

The complete raw certificate details for 69080.com in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----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-----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 379813228904963929688097664349049409187526
 . . . . . . . . [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 'Let's Encrypt Authority X3'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-12-02 19:20:47 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-03-01 19:20:47 +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 '69080.com'
 . . . . . . . . [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 (4208 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 973320668588453504643934082446899730479595723818060178856899324071720920210470664777507409738536534102752841977684908345890139952901326166392673772887355367032308242503229051200944623428603640825661113730011395040955975100755158794189050134628208433452247168705178554755932945348795469264873377112954266768239069797526483753674302150372920277071403121234554944379164630932001571824610576239348123485422318433090850638493995886143794984851161411828636676438836233733141929823592638164350450070401064728200643613857184579690208684661446373129695816097637022511443244963009643272762174629732119365655225377203724427242373470237983413164612108381623105190176974840029187294298864467517647759975005413557754751223707508648954018468277823858761491032183552272750309940332884645536119044648822026425034202919458236988261495596063415702614410824999967192946988754145053076943012287209113880318415024768965107985450200079493699315813554657571085019822858706371158001067856906469456920749750114533858678704349495795898199397322018568890176844423366125528625564965179617816231497581935402941352227107299011483603989364558813898492266297324576342287687619456424223497718595006359291410707641898441191306137366473091820615565999362112700422056701
 . . . . . . . . . . . . . . . . . . . . [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)
							9fd498700bca4025a703fb830d685186ea3b6de9
 . . . . . . . . . . . . . . . . [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 a84a6a63047dddbae6d139b7a64565eff3a8eca1
 . . . . . . . . . . . . . . . . [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 (99 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://ocsp.int-x3.letsencrypt.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://cert.int-x3.letsencrypt.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 (13 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String '69080.com'
 . . . . . . . . . . . . . . . . [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 (246 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes)
							00f1007600b21e05cc8ba2cd8a204e8766f92bb98a2520676bdafa70e7b249532def8b905e0000016ec845cd8a0000040300473045022003727fa42b16dd1cb90eea7038fb8c34b617fd4d58d174d81e3912898e5fb3b0022100a16fd3ebb9aee050c74bb126eb8cdcdef078efcc927190c5257834fe93baf4900077006f5376ac31f03119d89900a45115ff77151c11d902c10029068db2089a37d9130000016ec845cdb80000040300483046022100d2e425af8bd96b8fac5e00c46819ab585182e7a3c2f435b29fe193d742642651022100b8885f7b4d8774946afef29ae0c6ca75ca36f2f2801751a646837cb5c4c89a84
 . . . . [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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