bunkerpress.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:b7:90:8f:7e:20:38:5b:70:38:5a:d6:c8:50:7f:bf:61:cd 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=bunkerpress.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:b7:90:8f:7e:20:38:5b:70:38:5a:d6:c8:50:7f:bf:61:cd
Serial Number (int): 410912970761552876729653301112134728376781
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 27:74:1e:c2:f4:54:a9:d8:1f:f1:d6:05:2b:6e:0b:8c:bf:24:af:2f
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): de:66:aa:b9:b1:56:90:58:de:f9:22:13:49:27:12:fe:3a:9f:ef:f4
Fingerprint (sha256): d7:58:cc:be:bf:de:d2:d6:23:58:78:9a:78:30:ef:fe:81:96:ba:28:1a:d5:bd:0a:f6:ed:0d:0e:02:37:77:b6

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 bunkerpress.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for bunkerpress.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

bunkerpress.com

Other certificates including the domain name bunkerpress.com

(limited to 100 certificates)
bunkerpress.com
bunkerpress.com
stressindustrialcomplex.com
bunkerpress.com
bunkerpress.com

Certificate

The complete raw certificate details for bunkerpress.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 410912970761552876729653301112134728376781
 . . . . . . . . [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 2019-01-07 13:36:59 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-04-07 13:36:59 +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 'bunkerpress.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 704826133580358812749323673116525468590469293727832888257633579571213360268870681324630172920255293071966662601814479561660921610590818983242396371723723318515611000707875583430631711381524923514798312473424035850204918812044710032388609545536687892421994273485517576490317160631457453822101479453460783629184920618540729508752367350347590072361725278909656999801973832553536075225812473482792290572426136521455466995195267319308881242240368972475820563443512357248967087052053037478556555637180546167831459596001798625970182805586925066021530916564709247221761753435945896273707865397553770757401654266285056874994166769669397648275111543319113568967642779605053407443340294992050191025488590392064468917920790766803961305354236866854003845388616022410425752759247615274872465088430614538712296877040702279845591552295257361245766309896354262029631939137862214978200381003215850229843877836388838026280432589840761450391338841618287324732208436187768513856232499683348249203025239659547415809036533295105914916756287525789708803688375490277151170261064605333240023748504163145684055735142554499690251576034244025131630838851221224134513267255889092311066072735348593741841463533135038590058336159110203323734313886878450285482163417
 . . . . . . . . . . . . . . . . . . . . [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)
							27741ec2f454a9d81ff1d6052b6e0b8cbf24af2f
 . . . . . . . . . . . . . . . . [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 (19 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'bunkerpress.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 (244 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes)
							00ef007600747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc560000016828becd960000040300473045022100cfd5939330470f332cef66d2756bcf4d248cfd8a230e8076beb7ff706fa09ec802204540f9c42efec1e6c01ee34e21fe643583133fa685aedb6c45148c5bfba389f0007500293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f4780000016828becd7c000004030046304402204a092de57575aade59a66da947107af607b88160c5b67a89417f44b7f71e426d02203e307c6322a19c5c5917bb0f9b38a0ec03f2ee1c42e5a03c8b707d4f5a859017
 . . . . [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)
		00930c98998bd52ad621c4ca8b3bd6094bca7ee868129bf589061542db11298c5806110886bc1919eab960f85a4a60f951e8bd92a41dd68f377fbb62872f2b023c16233a86a9d2e1ba555219dbaf090ad7276ea8a03a529afe5bc0e97525c100c369cfc896f50e54b81b35dba7092a3d0a52cc5a7d8177dcfe7cb2a66bd0f51a3f85922ba8f0e3797d1ff879d560aadbf4521574eb3bf25564ce2c4e305f2f4138b027d9968d1f47c1d7e7990b18ee2cd5806ccdd74d6d68683d8d255346b4a417e98f445e6ef5a3f31c1af17bad67e9271d408abef731982d9bad3515cd8d485df363700d7332438e4bce26d36ab4ddd2d7cf322ca8e024803c5dd6a45812bd7b