www.53851.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:71:d3:b4:01:95:39:18:f4:6f:10:4a:93:2c:ff:fb:82:c9 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=www.53851.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:71:d3:b4:01:95:39:18:f4:6f:10:4a:93:2c:ff:fb:82:c9
Serial Number (int): 300070167009997016461751596396698570293961
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 6f:f3:6d:fa:49:c5:1a:b4:86:fb:1e:7e:d4:9b:83:39:bf:ee:1c:af
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 9a:3f:ba:bc:00:fc:16:ba:d4:54:33:a9:0f:b3:78:0f:63:12:8e:a9
Fingerprint (sha256): 20:25:a9:67:91:65:b2:7f:6e:22:77:62:a7:23:c6:b5:16:42:41:3a:ef:b9:8f:98:e1:f7:ff:55:86:5f:3f:21

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 www.53851.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.53851.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

www.53851.com

Other certificates including the domain name 53851.com

(limited to 100 certificates)
www.53851.com
www.53851.com
53851.com
82951.com
53851.com
53851.com
53851.com
www.fleener.boston
www.53851.com
53851.com
www.53851.com
www.82351.com
www.53851.com
www.53851.com
53851.com
31871.com
53851.com

Certificate

The complete raw certificate details for www.53851.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 300070167009997016461751596396698570293961
 . . . . . . . . [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 2020-03-15 03:02:25 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-06-13 03:02:25 +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 'www.53851.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 852976521535197536242709743389792849197139244886958648601546862840469501023268002752132116263388450566597990488162292908665107052274778202460665513522270670857047052136615973044110688462704002492272523114121532323864304372037318611973940850766830716815537707864627648432292305610590836782407904407762185603516932593612741943296054652007515649707453375469343273537097958102566892856850486249797252842357467891841415248122345555206157817446231955670145776946037234062613530283957848205360354270048429699322254136231551905812831673610500318252646382880615940717414569504731645938142846139855685571290598251404501073047393547192246192287055983683498779134337590013887941025277625985238937717584643538097595958722271174482023656613388223100387972942406647504835936898996522068178704346442725013194193670235597165616344130399243493785795346396452626987837270242245533774185501942085173776855578511285874561449399329501378434094020325421561677697309095925135140958188395496050583705647218483810589771014831940031724086807078735446842167045526388994017671645202807255126602393947908567558217893203860813234991325509835827124766525184379850981795936603132236091193059667582316200710795295543031999728549911129608832751434643320803120214223637
 . . . . . . . . . . . . . . . . . . . . [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)
							6ff36dfa49c51ab486fb1e7ed49b8339bfee1caf
 . . . . . . . . . . . . . . . . [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 (17 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.53851.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 (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f0007600f095a459f200d18240102d2f93888ead4bfe1d47e399e1d034a6b0a8aa8eb27300000170dc5b73e600000403004730450220259eef91d8fee4130cc878125f188556daeb0fee3fea7ae7ccfb095c47898831022100d84a662148420ce090acdb1cd3a44da1655728ed422611a2be9401427656110c00760007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c00000170dc5b7424000004030047304502200d61727b3d7006dd8e01b13535a9eac6a53faee8ec562dc5f0fec4437932cba0022100f16ebefb4016f3e423482843474316e43a3722d4c3bcd784fb3b4d7fba0f3612
 . . . . [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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