47082.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:2b:b4:19:4d:0b:0e:79:23:3e:36:8e:56:a2:e2:b0:96:48 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=47082.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:2b:b4:19:4d:0b:0e:79:23:3e:36:8e:56:a2:e2:b0:96:48
Serial Number (int): 276208391982165370602037863926772234491464
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 0d:99:cd:f2:f9:00:5e:1c:05:df:1f:40:cd:18:c4:f3:eb:2e:76:28
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 0d:4a:54:38:d3:dc:f0:53:6c:d8:2e:f6:01:3e:ee:fc:dd:be:67:a5
Fingerprint (sha256): 65:ee:a5:52:c8:39:e7:d4:a6:5b:0f:1d:60:93:6e:f1:76:f1:f5:0e:b5:23:be:9b:69:50:e1:04:4c:88:ba:c3

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 47082.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for 47082.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

47082.com

Other certificates including the domain name 47082.com

(limited to 100 certificates)
www.telefonium.com
www.47082.com
47082.com
47082.com
47082.com
stlouisstemcell.org
42803.com
47082.com
www.47082.com
www.47082.com
cailyn.org
www.47082.com
www.47082.com
47082.com
47082.com

Certificate

The complete raw certificate details for 47082.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 276208391982165370602037863926772234491464
 . . . . . . . . [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 2020-02-04 02:24:19 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-05-04 02:24:19 +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 '47082.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 704441440080279275048459137908834481363158860683291570242305287112459610734715400243373061193905843532304347821803889491629513377724306918645776442630788599339288361311754271245683272136556183060278036982168464239665515541588593603010553657040749266323135090015965327886314848381409304866687010676554830305901420704289018926837831009503705623719712049670155554538799785955465818744423337801629799004484063179667977056122749946058986209724292720317179548472307970008636514252284516931731088028695328828237893618289851514314842734441007916508565969972370492483745120476000415136045786544257134589015441232420364169285932796248802268607169438574608339527750504070482986801970129171403530641592735468187929266112569385475627742748424479579919429866255193424767280815446915161481923643587129187915212129785673528412042910211651620307468131150463348920655094596255874506857226382787721570406342691005782970432483021962157928875196578895765828743287609464162227026406700894222930123528848266313166576742487101216740789395665790571419499423653513098451590790451500428080671100487946455292153465636169825920430712027066313868336483343881516969778382184722409383893797344358148015918548079297193921623644966664017900026625591581429068979871641
 . . . . . . . . . . . . . . . . . . . . [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)
							0d99cdf2f9005e1c05df1f40cd18c4f3eb2e7628
 . . . . . . . . . . . . . . . . [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 '47082.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)
							00ef0076005ea773f9df56c0e7b536487dd049e0327a919a0c84a112128418759681714558000001700e3a3287000004030047304502205f367c5e7509f6a60c8c148f63f6d0365ae308b80629edece59b03b9b7f860c3022100e23d4fd8397349f025a50316a58fe241550eb968095d2f83bf70db86a3cc9fa2007500b21e05cc8ba2cd8a204e8766f92bb98a2520676bdafa70e7b249532def8b905e000001700e3a3299000004030046304402202dbe9b985669678e15ce6196ddf68eabeb5e6eb078dc7e0c6a73abbb922dcf75022077e6ec97f1ab5dfe857b8462aab56eaadd6686ec32490903f001126209830eb8
 . . . . [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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