sementesmacoppi.com.br
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:f8:f8:92:d8:5c:53:8f:04:0b:79:d3:48:f6:93:36:59:5c was issued on by Let's Encrypt.
With 2 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=sementesmacoppi.com.br
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:f8:f8:92:d8:5c:53:8f:04:0b:79:d3:48:f6:93:36:59:5cSerial Number (int): 346057295798284809591484176474590485567836
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: 10:4f:f9:55:00:39:ce:95:1a:be:f9:c4:ba:bf:a8:f0:33:0a:13:f6
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): 46:cd:0e:1a:8a:66:9d:b0:62:05:52:7b:17:98:a3:7f:0e:51:86:b2
Fingerprint (sha256): 4f:56:6d:af:58:de:ef:93:c8:08:ef:1a:48:94:75:97:12:e5:19:8d:64:f7:ba:65:f4:f4:a8:d1:22:ed:af:4f
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate sementesmacoppi.com.br
2
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for sementesmacoppi.com.br
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
sementesmacoppi.com.br
www.sementesmacoppi.com.br
www.sementesmacoppi.com.br
Other certificates including the domain name sementesmacoppi.com.br
(limited to 100 certificates)
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
sementesmacoppi.com.br
Certificate
The complete raw certificate details for sementesmacoppi.com.br in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIGMzCCBRugAwIBAgISA/j4kthcU48EC3nTSPaTNllcMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xODA2MDEwNDQ3NTdaFw0x ODA4MzAwNDQ3NTdaMCExHzAdBgNVBAMTFnNlbWVudGVzbWFjb3BwaS5jb20uYnIw ggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQChvBVcKbOOQdBZX3kyKSQs ZL5OgoU1GaaXePyQc+K0ZHkicNVJNd51R8ZQ8H8vHxPVQhzppUOOBGc7s6zHPeNP eZXDZWwSuw+ilanxcrujSlRE0Tfu0mZAc3KJx0LJtrp9clvC68M27yys2sv+0SIh Os0Thozav9GE4Onc7dCZin+nWwoASBS/LSqZXswdmcITlHoxUxekitKD0xA25q1A RcsLWisqpdoeR5XKNkqQIwPZu0toI/LitXlyRsI03XswXJrwcVhi/9/f6ySEOEDj 1Mo9wwYx1gGUdpPoVk+zJJHJGjGrTAFrDQN2MYNiwo0xs8tExOSJS/Wktzq1XyMZ AgMBAAGjggM6MIIDNjAOBgNVHQ8BAf8EBAMCBaAwHQYDVR0lBBYwFAYIKwYBBQUH AwEGCCsGAQUFBwMCMAwGA1UdEwEB/wQCMAAwHQYDVR0OBBYEFBBP+VUAOc6VGr75 xLq/qPAzChP2MB8GA1UdIwQYMBaAFKhKamMEfd265tE5t6ZFZe/zqOyhMG8GCCsG AQUFBwEBBGMwYTAuBggrBgEFBQcwAYYiaHR0cDovL29jc3AuaW50LXgzLmxldHNl bmNyeXB0Lm9yZzAvBggrBgEFBQcwAoYjaHR0cDovL2NlcnQuaW50LXgzLmxldHNl bmNyeXB0Lm9yZy8wPQYDVR0RBDYwNIIWc2VtZW50ZXNtYWNvcHBpLmNvbS5icoIa d3d3LnNlbWVudGVzbWFjb3BwaS5jb20uYnIwgf4GA1UdIASB9jCB8zAIBgZngQwB AgEwgeYGCysGAQQBgt8TAQEBMIHWMCYGCCsGAQUFBwIBFhpodHRwOi8vY3BzLmxl dHNlbmNyeXB0Lm9yZzCBqwYIKwYBBQUHAgIwgZ4MgZtUaGlzIENlcnRpZmljYXRl IG1heSBvbmx5IGJlIHJlbGllZCB1cG9uIGJ5IFJlbHlpbmcgUGFydGllcyBhbmQg b25seSBpbiBhY2NvcmRhbmNlIHdpdGggdGhlIENlcnRpZmljYXRlIFBvbGljeSBm b3VuZCBhdCBodHRwczovL2xldHNlbmNyeXB0Lm9yZy9yZXBvc2l0b3J5LzCCAQQG CisGAQQB1nkCBAIEgfUEgfIA8AB3ACk8UZZUyDlluqpQ/FgH1Ldvv1h6KXLcpMMM 9OVFR/R4AAABY7njZjAAAAQDAEgwRgIhAP2hpCs7cCOS8sd6XMT9CeqUv6B1FRhy PfalOqMAXM3TAiEAiVW8FQhe3n1dNFTM3LOqo7SATOcc+gbmJfGUAF6m+E4AdQBV gdTCFpA2AUrqC5tXPFPwwOQ4eHAlCBcvo6odBxPTDAAAAWO542bcAAAEAwBGMEQC IB3pLq32DZAeNjK9r+q8FNyAyj718cRQbannNwejGFDuAiBB3B47Q7oJA96jmMLh xCSWbr5xnlFxh+gb+z1zV0yWKTANBgkqhkiG9w0BAQsFAAOCAQEAjKebV5WRkHEX cDoDAiJB1Nh/bg2R+nHZ7pIoKTmYha6Ae4CwNRFh+AqL1TMP3DMahtOUpFAm/5NL MePn43aexVBikXBoMNtHaVqBp+thW0k8nEc+G+XeiuA+W9mzhQXVWJNEr9c8RTXT Dfc6ijMYLfBdw+L+c4dkHLD7/kCL8fsYFNZyWvnyrSYeaRTvu5zvm5KniVUwvn7z o5Et9t9RmYCqnMnrzlEp5wPq+M3v8YViafhAJuTt/UYBLGKYUl/eVSCLN6SDGnPk P4u4UghDHZmn6XvIQ8HnDhydiKpDzvishtahro66GJdxrE/uBc7MJFxpl2h7x34U s+G6Ucp2Sg== -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAobwVXCmzjkHQWV95Mikk LGS+ToKFNRmml3j8kHPitGR5InDVSTXedUfGUPB/Lx8T1UIc6aVDjgRnO7Osxz3j T3mVw2VsErsPopWp8XK7o0pURNE37tJmQHNyicdCyba6fXJbwuvDNu8srNrL/tEi ITrNE4aM2r/RhODp3O3QmYp/p1sKAEgUvy0qmV7MHZnCE5R6MVMXpIrSg9MQNuat QEXLC1orKqXaHkeVyjZKkCMD2btLaCPy4rV5ckbCNN17MFya8HFYYv/f3+skhDhA 49TKPcMGMdYBlHaT6FZPsySRyRoxq0wBaw0DdjGDYsKNMbPLRMTkiUv1pLc6tV8j GQIDAQAB -----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 346057295798284809591484176474590485567836 . . . . . . . . [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 2018-06-01 04:47:57 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2018-08-30 04:47:57 +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 'sementesmacoppi.com.br' . . . . . . . . [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 20417114499331407439693348695458815696520967050184801148607858802186345097540233124965951491040594816232247961331098539056703073674501698655873582869834834007154400786541082236368002284333241794205642998895021082073998809176951868297319983550670179034274756899875107178591294600208864254361156288026947223196346567195747715145178875539452039513815024287375360402682697399810109605039189217204758339967839089749799402386967649676627326719018742884987526691430458684329132939077962451629218321567660405696352112684499871151358023556934902141637287660572977848847188157087432465561394410105656578487418806885028858897177 . . . . . . . . . . . . . . . . . . . . [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) 104ff9550039ce951abef9c4babfa8f0330a13f6 . . . . . . . . . . . . . . . . [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 (54 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'sementesmacoppi.com.br' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.sementesmacoppi.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 (246 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 1.3.6.1.5.5.7.2.2 (unotice) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:12|false] UTF8String 'This Certificate may only be relied upon by Relying Parties and only in accordance with the Certificate Policy found at https://letsencrypt.org/repository/' . . . . . . . . . . . . . . . . [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 (245 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes) 00f0007700293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f47800000163b9e366300000040300483046022100fda1a42b3b702392f2c77a5cc4fd09ea94bfa0751518723df6a53aa3005ccdd30221008955bc15085ede7d5d3454ccdcb3aaa3b4804ce71cfa06e625f194005ea6f84e0075005581d4c2169036014aea0b9b573c53f0c0e43878702508172fa3aa1d0713d30c00000163b9e366dc000004030046304402201de92eadf60d901e3632bdafeabc14dc80ca3ef5f1c4506da9e73707a31850ee022041dc1e3b43ba0903dea398c2e1c424966ebe719e517187e81bfb3d73574c9629 . . . . [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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