blackmba.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:e3:31:88:df:c1:b3:29:ec:79:d6:9e:33:8b:f0:03:5e:5d 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=blackmba.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:e3:31:88:df:c1:b3:29:ec:79:d6:9e:33:8b:f0:03:5e:5d
Serial Number (int): 338646797948823818239405658595954482437725
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 26:87:9e:a6:83:2f:07:34:57:aa:ec:da:10:ff:86:4d:91:ce:08:f9
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 34:b7:a6:42:8e:3d:dc:b0:86:0c:69:08:0e:fc:46:1d:9f:ef:11:ec
Fingerprint (sha256): d8:51:b2:40:c3:16:79:00:1b:d2:da:f7:75:f2:2c:31:e3:cb:8c:d1:57:bf:f9:6d:8e:93:6d:59:26:58:37:e9

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 blackmba.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for blackmba.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

blackmba.com

Other certificates including the domain name blackmba.com

(limited to 100 certificates)
blackmba.com
www.blackmba.com
blackmba.com
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www.blackmba.com
blackmba.com
www.blackmba.com
blackmba.com
www.blackmba.com
corrado.org
blackmba.com
blackmba.com
profound-strategies.org

Certificate

The complete raw certificate details for blackmba.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 338646797948823818239405658595954482437725
 . . . . . . . . [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 2019-08-28 04:38:00 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-11-26 04:38:00 +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 'blackmba.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 897860117419507747908775490470721916954672058894048217234266066735846641783665620093043762888305357463026262823357327566610597184120814445492196997267726036872891333578435410183521785748118939753245259985033289908036491433021918844128881931507085659869208419414690304559463208418990942332492404634094642901850664648773733143680169776636979725029967984209390070721835414717019808414058733616321461936286777114046593157736537331998639840952756159811295153171709986572320469031802967170889311109421680136556631810890042333381381248655008865769417366554559054094748172326432443990061138131082135426042275206715014336733604048312404769515030691780950795030962766121982669220461105048410190238102449577426224016525521749658851845381422582783714391618681477508564355048096678374480598831634915692012518061743030546704313128304252777033992058070410755044593155448036006348781776750877375770224307453613577631426877565318540876084373425392224488378522401381391870947999670409015397672301770897904825123504221850304660439464750364824926646068253377043756416331573734202191832572103110257340478227252215000069524757502529247637454000105951559251236056369849204762256797879131284049850488076989196604516386750814190664845731308901592328253101603
 . . . . . . . . . . . . . . . . . . . . [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)
							26879ea6832f073457aaecda10ff864d91ce08f9
 . . . . . . . . . . . . . . . . [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 (16 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'blackmba.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)
							00ef0075006f5376ac31f03119d89900a45115ff77151c11d902c10029068db2089a37d9130000016cd6bb144a000004030046304402202b105d387b37b422bddde4d0013451f500280058ed9e5b6ea509da8b2f94ae94022016d8c29021c4a1d94c0d5ef9d9a14ade5b14f4f2833a68d0a6201cc5f575462c007600293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f4780000016cd6bb14290000040300473045022100eabfdea43b6b5a39f9f1bbb4506c3289ae55c7753659ba41610918a02486ce62022010f7bf87e1c70f712b1c060f5a32575f5d44d7fd28b645bc3a349cb61aa71e1a
 . . . . [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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