www.polygoneducation.com

Issued by R3

About this certificate

This digital certificate with serial number 04:0c:ec:29:d5:7b:6d:54:ac:de:ad:9b:15:51:39:5c:f6:87 was issued on by Let's Encrypt.

With 4 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=www.polygoneducation.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:0c:ec:29:d5:7b:6d:54:ac:de:ad:9b:15:51:39:5c:f6:87
Serial Number (int): 352846447151200834021248571435770680505991
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: f8:af:b2:75:79:ce:2a:dd:d9:f8:0b:3f:75:82:8a:8e:a8:c4:c2:63
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): e0:21:9e:e0:ac:83:01:7f:48:10:97:20:79:4b:ec:d3:fd:92:60:41
Fingerprint (sha256): 32:67:cb:c1:04:2d:42:ec:17:08:26:12:58:63:29:06:5c:a1:f9:7e:5c:6b:0f:2a:85:9b:da:a8:c0:44:f4:5f

Issuing Certificate URL: http://r3.i.lencr.org/

Revocation information

OCSP Server: http://r3.o.lencr.org

Check the revocation status for certificate www.polygoneducation.com

4

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.polygoneducation.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

formularios.polygoneducation.com
polygoneducation.com
www.polygoneducation.com
zonaprivada.polygoneducation.com

Other certificates including the domain name polygoneducation.com

(limited to 100 certificates)
plataforma.polygoneducation.com
plataforma.polygoneducation.com
media.polygoneducation.com
tienda.polygoneducation.com
tienda.polygoneducation.com
tienda.polygoneducation.com
www.polygoneducation.com
tienda.polygoneducation.com
tienda.polygoneducation.com
tienda.polygoneducation.com
www.polygoneducation.com
tienda.polygoneducation.com
plataforma.polygoneducation.com
tienda.polygoneducation.com
reuniao.lugaresurbanos.com
plataforma.polygoneducation.com
plataforma.polygoneducation.com
www.polygoneducation.com
tienda.polygoneducation.com
media.polygoneducation.com
tienda.polygoneducation.com
www.polygoneducation.com
media.polygoneducation.com
tienda.polygoneducation.com
tienda.polygoneducation.com
dev.polygoneducation.com
www.polygoneducation.com
plataforma.polygoneducation.com
plataforma.polygoneducation.com
tienda.polygoneducation.com
plataforma.polygoneducation.com
media.polygoneducation.com
www.polygoneducation.com
media.polygoneducation.com
tienda.polygoneducation.com
tienda.polygoneducation.com
tienda.polygoneducation.com
www.polygoneducation.com
media.polygoneducation.com
plataforma.polygoneducation.com
media.polygoneducation.com
media.polygoneducation.com
www.polygoneducation.com
www.polygoneducation.com
plataforma.polygoneducation.com
www.polygoneducation.com
media.polygoneducation.com
meet.polygoneducation.com
tienda.polygoneducation.com
media.polygoneducation.com
www.polygoneducation.com
media.polygoneducation.com
comunicarte.polygoneducation.com

Certificate

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

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAw1YvhnXfbqDt6yORfr+k
280kwuH+6SLziuAPRE3X+dvpMB6AHkXaKfUgytOr7b6wzPlfZtX9n8QjTeiNmO0Z
ZdmfS6ULODidGzcy6qSsNTtPIvNroE6JsJruxXm+6dLNIxUuLAuFPgG3l+oVjfRZ
/lD37oHjyXKGGKXI0WYOil4fqjrohU7YXYQ0Ibpgzg+KKlzXj7GeeQtply5V1p+P
8PJr+5unHfP70/nWK/LjlpkMuX7ZlcI+H7p0JhDIF9vO76r2NOygh+s5nIyQE9HA
HpmfQptCmpIQqzSnkwEo+yU+kbooIpHk4JGFr0wiZ9L2pTZRxM99lQuhUCqnnv97
3wIDAQAB
-----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 352846447151200834021248571435770680505991
 . . . . . . . . [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 'R3'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2022-12-30 18:31:27 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-03-30 18:31:26 +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 'www.polygoneducation.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 24658969194141023116870336136871568376736917827130119227631882492568834820275074864302706220604734967315362822370966503753297389472110740178156545749869510895201319559595641771796192734553388962074299305508820166815969526111678584390709975538368096434569887278685547637193841880937421848681489302336383945424500025399891279574804695685645103842257922477029360294708958539237303162377113205077805972419968315226907909041902781157695298636331017321212408994406296095672195840558829288268830257535971120687813320691482927218245644504887926935672194708262512990865318383692820546023170734480606069777860152244234063150047
 . . . . . . . . . . . . . . . . . . . . [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)
							f8afb27579ce2addd9f80b3f75828a8ea8c4c263
 . . . . . . . . . . . . . . . . [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 142eb317b75856cbae500940e61faf9d8b14c2c6
 . . . . . . . . . . . . . . . . [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 (73 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://r3.o.lencr.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://r3.i.lencr.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 (118 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'formularios.polygoneducation.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'polygoneducation.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.polygoneducation.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'zonaprivada.polygoneducation.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)
							00ef0075007a328c54d8b72db620ea38e0521ee98416703213854d3bd22bc13a57a352eb520000018564849460000004030046304402203d20f88bc4da4302738894010067afc62451cad461a30310ced711f132295ab60220752ba6c85b75a7503a5ca4fbe605e58ac1d6525afd015caf6218871e9eab336c007600adf7befa7cff10c88b9d3d9c1e3e186ab467295dcfb10c24ca858634ebdc828a00000185648496b60000040300473045022100e8d1e573778e3c4a07eedc7b7f6b372901e0ce8ee731cc4cd381a959d3d2f50f02200edb2d14a33b950f955f3d7c66cb10c950e356f8a6092a7ea0f23b94f76d4c6b
 . . . . [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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