saggecovillage.earth

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:04:f3:66:14:8e:05:8e:fe:92:97:1a:cc:05:be:aa:d4:a7 was issued on by Let's Encrypt.

With 8 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=saggecovillage.earth

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:04:f3:66:14:8e:05:8e:fe:92:97:1a:cc:05:be:aa:d4:a7
Serial Number (int): 263021519697120110348018568106539108455591
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 59:aa:10:47:5d:61:d0:05:eb:d1:6a:e4:fa:e3:a6:98:a8:ff:5f:8c
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 21:d2:f8:80:ef:41:27:dd:e3:d0:db:4d:dd:0f:4e:57:74:d4:4e:0b
Fingerprint (sha256): a0:88:ea:bd:76:3e:86:c6:aa:61:78:aa:d8:ff:b4:db:d3:20:d4:c2:70:65:5d:d0:67:a4:7d:6d:fd:be:d0:de

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 saggecovillage.earth

8

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for saggecovillage.earth

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

cpanel.saggecovillage.earth
mail.saggecovillage.earth
saggecovillage.earth
saggecovillage.moolsustainability.org
webdisk.saggecovillage.earth
webmail.saggecovillage.earth
www.saggecovillage.earth
www.saggecovillage.moolsustainability.org

Other certificates including the domain name saggecovillage.earth

(limited to 100 certificates)

Certificate

The complete raw certificate details for saggecovillage.earth in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAqtR5eJcBSzDmIOqj5ETS
nEiV/FzXjU8nzQ7HbzRpfr3kK9A+Fm4cPDQoavkBLh+ftAXAHwYI6keHI8nr9sRK
ogzIvInKJFu1R1Vzpa+K4CfvZ+QSi0U0BnO9o8xOjfXzkWbF64lev4da3Xq944z9
1Er2o4WW5BmAtnnpfoKFaTFkfixobMDnyDQ9MTKgTbsUYDRvVlum9CnZHH7mZXFl
cnDDwpAHwExS4fT0F7sebrRqOLIa8Bc66vhcaDNy7RIdLyXDVBrSa5z+LVMkpimB
+vIIjcsUPtAEzNppnpKvvb5PhJwUH0W+ggoi7XRMzFpADPB+tz+rWJSdJWQP/A3v
9wIDAQAB
-----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 263021519697120110348018568106539108455591
 . . . . . . . . [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 2019-07-17 11:45:00 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-10-15 11:45:00 +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 'saggecovillage.earth'
 . . . . . . . . [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 21565286923378781819952596237218693950054283671007236466366459782374713163793722788917831185871870176953338930233978950983501561655364066550252729992818263521275769238793478382402898401356356781290461823311027891754048427088997257262152204420779818746638205019394028254627179894116335783153354398371242249986592709544178249843899363641396804470854732133759669734156944688442044912192765804289293010345891512915956510811750415659156397791548201818977422778796492510035948642018268463847430817898579712517141041558344872873459288607152869137499293814486291985122973879757240869438699349516964943731300412189714099859447
 . . . . . . . . . . . . . . . . . . . . [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)
							59aa10475d61d005ebd16ae4fae3a698a8ff5f8c
 . . . . . . . . . . . . . . . . [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 (249 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'cpanel.saggecovillage.earth'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.saggecovillage.earth'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'saggecovillage.earth'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'saggecovillage.moolsustainability.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webdisk.saggecovillage.earth'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webmail.saggecovillage.earth'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.saggecovillage.earth'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.saggecovillage.moolsustainability.org'
 . . . . . . . . . . . . . . . . [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 (243 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (240 bytes)
							00ee007500747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc560000016bfff6eb1b000004030046304402201a317171781f9d8cf712fac99a4b850cc484046f7cae97f0f47dc062f876453602201e14f9bc2ab2f4ce8112a01add6383e1ea8cacad3e5ea9135a2542ffcc58a4eb00750063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d0000016bfff6eb3800000403004630440220402d238003e594a17ab1276a88ba51c27dfeb6cf27c608aaee52ee3a21d01eb70220379499063a40485e4800c4e78075bea42823e933aae734fd9819667082f128c9
 . . . . [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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