www.eventerater.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:94:38:fd:48:7c:0a:f7:05:22:c2:be:a9:25:20:c2:aa:64 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=www.eventerater.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:94:38:fd:48:7c:0a:f7:05:22:c2:be:a9:25:20:c2:aa:64
Serial Number (int): 398886685920370220873065432523194490858084
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 86:32:b3:57:1e:8b:2c:7e:36:0d:27:5c:94:65:a0:05:c3:18:26:f6
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 67:b3:bf:f5:f3:fc:93:fe:3b:d5:b2:41:0b:0e:d1:e3:fb:72:d6:44
Fingerprint (sha256): 6c:a8:41:c7:24:09:62:77:07:f1:fd:01:37:ec:f6:24:eb:b1:77:e2:7b:08:f6:d3:31:f6:ac:d6:d3:bc:ba:60

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 www.eventerater.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.eventerater.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

www.eventerater.com

Other certificates including the domain name eventerater.com

(limited to 100 certificates)
eventerater.com
www.eventerater.com
eventerater.com
www.eventerater.com
www.eventerater.com
www.eventerater.com
www.eventerater.com
eventerater.com
eventerater.com

Certificate

The complete raw certificate details for www.eventerater.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 398886685920370220873065432523194490858084
 . . . . . . . . [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 2019-10-28 08:32:26 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-01-26 08:32:26 +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.eventerater.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 799435463674816615781382311976124016544974039140623342534497636883039077163540363928743250408658755567651092730316596801639466987157811269217209002832636348149711250003894953712505850959699244434585894060123891260288325912712100762827624885906329556128408427357862867267454535919154454796465539718851442094121820470358506440314258895923061742104486054206187761775091734264170614872408907170593612608645778253303231060972199089276560956769738162932650437921186239283672805891533389027397238080493744900903459872785423908398829542638278115364110131486102561768268762955401641106367318154655932683235352024703683865424530429222618034556836967769844330090550832320885462709433435422092799121517631076095068787518431089911520968419020231393145995477301994034729850877937449774848517069363451994020113078543003367214993642628568577568601608501118933354882043459686851865507052512709694623408846713570469176078202109039039031882387653736824598326544249966199384158008277078506139354026387938293140982848694226565463434199724006650445381681118897229027092699404593040360181468496228606068357079548435340445234670419995409453141963184758150450111185964828104962053343692194000480480340376217451181359023881817262991906632714123270614263283841
 . . . . . . . . . . . . . . . . . . . . [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)
							8632b3571e8b2c7e360d275c9465a005c31826f6
 . . . . . . . . . . . . . . . . [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 (23 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.eventerater.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)
							00ef0076005ea773f9df56c0e7b536487dd049e0327a919a0c84a1121284187596817145580000016e11b5a4230000040300473045022100fa9bfaeed99be5bd42113954bbd3c9a6bd64c3ef832e5a4b497a1193c05824fe0220309c5552fff05cf83c88895210313252ccfd890b67eadf063a3bd10c0de22e5c007500b21e05cc8ba2cd8a204e8766f92bb98a2520676bdafa70e7b249532def8b905e0000016e11b5a425000004030046304402203830f971209ee2cc26673529f4155b3d3845d7967edf8baf81731246847358dd02204fd5410872b60e76a2893421ba4d059bd4f124d7f0cdceb6b273de11ac93c066
 . . . . [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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