corujaacademy.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:59:7b:7e:8d:28:2e:80:94:14:8b:07:7c:90:34:60:f7:15 was issued on by Let's Encrypt.

With 9 subject alternative names this certificate can be used to secure multiple fqdn's. 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=corujaacademy.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:59:7b:7e:8d:28:2e:80:94:14:8b:07:7c:90:34:60:f7:15
Serial Number (int): 378898426518893502243086289467546462648085
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 89:bd:1c:94:57:59:96:87:21:9d:a3:c7:76:b0:f1:10:24:18:8f:50
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): b7:e3:e9:08:82:e6:2b:5f:99:ee:ba:85:52:22:c3:d6:67:b9:92:04
Fingerprint (sha256): dd:6c:6c:65:83:e4:4a:39:be:4e:80:ec:cc:93:1e:59:30:df:82:c1:bb:de:5c:87:be:9c:ca:ba:1b:b0:ac:49

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 corujaacademy.com

9

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for corujaacademy.com

Public Key Algorithm

RSA

Key Size

2048

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

autodiscover.corujaacademy.com
corujaacademy.com
corujaacademy.nutriestilo.com.br
cpanel.corujaacademy.com
mail.corujaacademy.com
webdisk.corujaacademy.com
webmail.corujaacademy.com
www.corujaacademy.com
www.corujaacademy.nutriestilo.com.br

Other certificates including the domain name corujaacademy.com

(limited to 100 certificates)

Certificate

The complete raw certificate details for corujaacademy.com in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA1zhtDJHrQpoy15neZWl4
w3J6G8oNpW8oeqgZDyrjata4b/PR+lyH288QMMs9o4hXFrGj5dtcfvGVXUEb8m3x
KB6EQ7yPmbbSjzeCfzL1+B6w9kbMw+73alErhDWGnSlPo1Y73LBaOxrWVduqj3PZ
ezampNtBx++hJ4siY0zUQxgfGAg/dLngyLxDbLjo6zpUzoAwGcngPfvC/zVZHoq2
05sghlH69+8FSAVJBwIGxtKZWLGjUh2YQqDc10SbvZO4JrqNtKh/uWp/KjEgaCb/
8Egn6HPTBhy3JgUUjEtlX4X0K+h8+uSPwWbB55ksD0fRLKcPoDhS8g4N/vZsed0y
1QIDAQAB
-----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 378898426518893502243086289467546462648085
 . . . . . . . . [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 2019-03-27 12:24:31 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-06-25 12:24:31 +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 'corujaacademy.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 (2160 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 27169060252055185313693096029594765922344455837426721777224975359110523196446619687702341119430990887816163055424921020690679084347332295532161429918676538122484110890531901630306305869501924178976922638717129034324248507391445347006142126883385385771331100629450145350435679015779855387502849458440028800613336542409204507442921401988700706164695226913274882258481236237231228127514685851929077198411865562898836553407948335137604201616069941593753732629031222307012322116645785648873992721120836409991226406442286605989924255094155306302284722446949316216555127988533824652485312127491835265885523747502394961638101
 . . . . . . . . . . . . . . . . . . . . [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)
							89bd1c9457599687219da3c776b0f11024188f50
 . . . . . . . . . . . . . . . . [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 (253 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'autodiscover.corujaacademy.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'corujaacademy.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'corujaacademy.nutriestilo.com.br'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'cpanel.corujaacademy.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.corujaacademy.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webdisk.corujaacademy.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webmail.corujaacademy.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.corujaacademy.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.corujaacademy.nutriestilo.com.br'
 . . . . . . . . . . . . . . . . [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)
							00ef0075006f5376ac31f03119d89900a45115ff77151c11d902c10029068db2089a37d91300000169bf52da7f0000040300463044022045fa0122f8616840c149c80cc540689f19e5e41a61a95de1a6904e456b944781022075d792790a681efc69880955525451b1140bd543feb5ee700cb83aed3873af5500760063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d00000169bf52d98d00000403004730450221008878c01ded8d7133c966f9a210d6d4b1f96f886a453baaec6a713690a1c6f695022012ef4a9734f9ead4718cfa342b7f2a87af142be24a0fa679f6d0809f9c94974e
 . . . . [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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