brainpool.co

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:ab:63:5a:ac:22:9b:4c:77:8f:d1:72:5f:41:7e:cb:c6:dd 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=brainpool.co

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:ab:63:5a:ac:22:9b:4c:77:8f:d1:72:5f:41:7e:cb:c6:dd
Serial Number (int): 319657206908377463971084288710709491779293
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: b1:d9:ca:45:22:9b:2f:d9:7b:6f:5e:b0:bf:d7:7b:ae:0b:1e:48:03
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 58:67:a4:da:65:b2:b6:13:d7:6a:40:ff:fd:b6:18:ec:dd:5e:96:c3
Fingerprint (sha256): 72:43:fb:11:6a:e8:4a:b7:8f:89:80:79:c1:2f:8c:11:15:57:d3:33:22:6a:95:16:ba:a9:dd:f4:b9:c7:9b:33

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 brainpool.co

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for brainpool.co

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

brainpool.co

Other certificates including the domain name brainpool.co

(limited to 100 certificates)
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www.dobell.co
gsrx.us
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brainpool.co
brainpool.co
brainpool.co
www.funeralservice.co
brainpool.co
brainpool.co
democratsstandunited.com
www.brainpool.co

Certificate

The complete raw certificate details for brainpool.co 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 319657206908377463971084288710709491779293
 . . . . . . . . [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 2019-06-11 09:05:58 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-09-09 09:05:58 +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 'brainpool.co'
 . . . . . . . . [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 817633992668622182390787247850485302433960355223108750138232826384628657920053398731053719454168815305095653900728273482863993392541717296607692601046446995451033140580652240486099590555689231334498550773382549185166495449249771219321646093122253123219396563315219593704989238181256234274308959497512353021052375085191866979962284522326178046257953798738721299933763847178011238305261488048473101369619525128920300307938280822286005458889496649029750796593804596631272969243483135975926190373364195973781898488462392449378097488195610355698635386616838690241880526648471419516081824500083611768305335922398984882179865582449022964471860544730613322810470795489150088379841856419613476514349940249617796470407508827550042216258607095322567859352020889940269072378367432480611924212573532160691988282533108110094007554965786106234136375646534357926977875093134376382499629527936063767809844783156639742859241752699681792121957081530766464177662455403218330823388016046434542757762833267166531222992873758123808729205855434114190970224493182859152132151008784872513818429662818931443750597899339674207409072310712411350531334965068227143427088032539452469393324177345702958807680534855299616237601512940010633524560630606315712865323063
 . . . . . . . . . . . . . . . . . . . . [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)
							b1d9ca45229b2fd97b6f5eb0bfd77bae0b1e4803
 . . . . . . . . . . . . . . . . [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 'brainpool.co'
 . . . . . . . . . . . . . . . . [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)
							00ef007500747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc560000016b460060ea000004030046304402203ea086330a1098b87f36dc7db1817a7f38194c7fa9b6bd82aca495058e388ba9022050b9f44bad6e3424c7358688f4577f248e95cc54484d7ac796ae937f01ae1572007600293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f4780000016b46006102000004030047304502207c196a91e046ae504906033098fa1d3bbbb59208a7c5030545f7a97769d9973e022100fbda5ade4145c193aa58ce5b6bc0ae960776915d42971a46542dded5739841db
 . . . . [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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