pt-br.secondwind.org
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:c0:fc:26:fd:d7:06:ba:f7:83:52:e0:fb:cc:9f:ea:f7:67 was issued on by Let's Encrypt.
With 5 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=pt-br.secondwind.org
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:c0:fc:26:fd:d7:06:ba:f7:83:52:e0:fb:cc:9f:ea:f7:67Serial Number (int): 327006240154805115651809109697674496112487
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: 15:52:02:a4:fb:7f:ea:51:48:85:98:e8:20:89:cb:4a:40:a3:5a:4e
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): 75:22:da:71:19:b0:dd:02:3e:59:70:c2:7d:e7:5c:44:bd:ed:59:d3
Fingerprint (sha256): ee:52:87:03:c2:84:50:12:6d:0f:b7:c8:9d:75:a7:16:6f:ad:75:5a:88:ba:2d:46:85:a4:cd:5e:a6:07:4d:0b
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate pt-br.secondwind.org
5
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for pt-br.secondwind.org
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
de.secondwind.org
es.secondwind.org
fr.secondwind.org
ja.secondwind.org
pt-br.secondwind.org
es.secondwind.org
fr.secondwind.org
ja.secondwind.org
pt-br.secondwind.org
Other certificates including the domain name secondwind.org
(limited to 100 certificates)
www.secondwind.org
www.secondwind.org
www.secondwind.org
pt-br.secondwind.org
www.secondwind.org
www.secondwind.org
pt-br.secondwind.org
www.secondwind.org
www.secondwind.org
www.secondwind.org
www.secondwind.org
www.secondwind.org
www.secondwind.org
pt-br.secondwind.org
www.secondwind.org
www.secondwind.org
pt-br.secondwind.org
*.secondwind.org
secondwind.org
www.secondwind.org
data-macau-pengeluaran.secondwind.org
pt-br.secondwind.org
www.secondwind.org
pt-br.secondwind.org
www.secondwind.org
www.secondwind.org
www.secondwind.org
www.secondwind.org
www.secondwind.org
www.secondwind.org
pt-br.secondwind.org
www.secondwind.org
pt-br.secondwind.org
pt-br.secondwind.org
www.secondwind.org
pt-br.secondwind.org
www.secondwind.org
pt-br.secondwind.org
www.secondwind.org
www.secondwind.org
pt-br.secondwind.org
www.secondwind.org
www.secondwind.org
pt-br.secondwind.org
www.secondwind.org
www.secondwind.org
www.secondwind.org
www.secondwind.org
www.secondwind.org
www.secondwind.org
pt-br.secondwind.org
www.secondwind.org
www.secondwind.org
pt-br.secondwind.org
*.secondwind.org
secondwind.org
www.secondwind.org
data-macau-pengeluaran.secondwind.org
pt-br.secondwind.org
www.secondwind.org
pt-br.secondwind.org
www.secondwind.org
www.secondwind.org
www.secondwind.org
www.secondwind.org
www.secondwind.org
www.secondwind.org
pt-br.secondwind.org
www.secondwind.org
pt-br.secondwind.org
pt-br.secondwind.org
www.secondwind.org
pt-br.secondwind.org
www.secondwind.org
pt-br.secondwind.org
Certificate
The complete raw certificate details for pt-br.secondwind.org in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIFrTCCBJWgAwIBAgISA8D8Jv3XBrr3g1Lg+8yf6vdnMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xOTA0MTMwOTAxNDhaFw0x OTA3MTIwOTAxNDhaMB8xHTAbBgNVBAMTFHB0LWJyLnNlY29uZHdpbmQub3JnMIIB IjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA7qg/07k1Tx4MiDwqGVNchBGF pk+nEHmdxZj36rSMdViHPluJtVoLbDdFgWm5SMPZDbvJTe7kcvCkxmiDAqw1uTpu D9e2RAWCzocQsUHNdg0A+RVFU54BAD8xpxoCSQt3br6wrlQMFJMFlVbXcpdFng3D G37klx07vp4KEE1Ju3Hd+99sy8IEiEHM/3QEpZHxa7Q9FWzHzysDW/53hNva8VzE VkGaSk9MjmkUscBltPu2lz5dlHHPqMOkl2TWi+Y8Y1Zie1j3DWrbFagxh31FfYxY A2JseM4AsVJlV40HuaNYTin2eP3WWn4QKFhO85N4JtegTEDAkSDNd0j45Q1jBQID AQABo4ICtjCCArIwDgYDVR0PAQH/BAQDAgWgMB0GA1UdJQQWMBQGCCsGAQUFBwMB BggrBgEFBQcDAjAMBgNVHRMBAf8EAjAAMB0GA1UdDgQWBBQVUgKk+3/qUUiFmOgg ictKQKNaTjAfBgNVHSMEGDAWgBSoSmpjBH3duubRObemRWXv86jsoTBvBggrBgEF BQcBAQRjMGEwLgYIKwYBBQUHMAGGImh0dHA6Ly9vY3NwLmludC14My5sZXRzZW5j cnlwdC5vcmcwLwYIKwYBBQUHMAKGI2h0dHA6Ly9jZXJ0LmludC14My5sZXRzZW5j cnlwdC5vcmcvMGsGA1UdEQRkMGKCEWRlLnNlY29uZHdpbmQub3JnghFlcy5zZWNv bmR3aW5kLm9yZ4IRZnIuc2Vjb25kd2luZC5vcmeCEWphLnNlY29uZHdpbmQub3Jn ghRwdC1ici5zZWNvbmR3aW5kLm9yZzBMBgNVHSAERTBDMAgGBmeBDAECATA3Bgsr BgEEAYLfEwEBATAoMCYGCCsGAQUFBwIBFhpodHRwOi8vY3BzLmxldHNlbmNyeXB0 Lm9yZzCCAQUGCisGAQQB1nkCBAIEgfYEgfMA8QB2AHR+2oMxrTMQkSGcziVPQnDC v/1eQiAIxjc1eeYQe8xWAAABahYlW5QAAAQDAEcwRQIhAMte8qYwlSbK8q2mXgZt pIysZaQY1GtjmFlJKmWRPOvwAiBkiNko1DK0dnsNkKrGKew6n1SMV5oilj7wVlCQ aVJ8IwB3AGPy283oO8wszwtyhCdXazOkjWF3j711pjixx2hUS9iNAAABahYlW+0A AAQDAEgwRgIhAPWMu0kJb+8K4lPfbxGbxtJwKP+BK87ORRKB1PlBv0R3AiEA41E7 Xms1nJA35IgLaw6wacsXaVim/RG1hlcnjQoVDNMwDQYJKoZIhvcNAQELBQADggEB ADySXtFkr1fFf+saFgISpJqYVB/96TyxBJGeAoITERKm8JvIQQkbBALaZHLVKBsw 4gFgKuUxOkrmVGtz8kdLMfrNQ8k7oL8MT7aG0n/rUFS8TPn2A62gFJxnw0EORqjy 1ynwuJzMxvBVv/8T8+jXfRjPXJ4bfN0YzsTZOQgFbo8tDOqFcrnmj1kH4jIklUm+ awdaJYWkBjLz5wPzq8JVtiRbTaGFsXLh/FDNgOufjix31uMj6Wl6o2xGikaa9Kc5 +59SthpmnyeU1ZY2CeLNOJ/CGbrk4p2is45UmyIWXGzBB1Bbzfj82vdduAkJX5LX QhMTnhBnxNH/cBOok6iNVPg= -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA7qg/07k1Tx4MiDwqGVNc hBGFpk+nEHmdxZj36rSMdViHPluJtVoLbDdFgWm5SMPZDbvJTe7kcvCkxmiDAqw1 uTpuD9e2RAWCzocQsUHNdg0A+RVFU54BAD8xpxoCSQt3br6wrlQMFJMFlVbXcpdF ng3DG37klx07vp4KEE1Ju3Hd+99sy8IEiEHM/3QEpZHxa7Q9FWzHzysDW/53hNva 8VzEVkGaSk9MjmkUscBltPu2lz5dlHHPqMOkl2TWi+Y8Y1Zie1j3DWrbFagxh31F fYxYA2JseM4AsVJlV40HuaNYTin2eP3WWn4QKFhO85N4JtegTEDAkSDNd0j45Q1j BQIDAQAB -----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 327006240154805115651809109697674496112487 . . . . . . . . [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 2019-04-13 09:01:48 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-07-12 09:01:48 +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 'pt-br.secondwind.org' . . . . . . . . [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 30127683415996769431391881930391749572168742502252020480422221765003548280117105126980727311824415667586978375604704847477016684118620644888380075515776178790114344365646532498613954694480825239061628839413259220333412234396392839759111313249749047781489507003766512727925237561632857018093768524806626962478522023097130867903034619700762678216614491568041123121554072076157874112623043855370888204566487702893006113493765439252524549899152788530297262344467281416917273068426504881318401921659681424425711513592744045560772274151674192453491400680179736256467398806777782920900397303724088341161013141346403809583877 . . . . . . . . . . . . . . . . . . . . [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) 155202a4fb7fea51488598e82089cb4a40a35a4e . . . . . . . . . . . . . . . . [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 (100 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'de.secondwind.org' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'es.secondwind.org' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'fr.secondwind.org' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'ja.secondwind.org' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'pt-br.secondwind.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 (246 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes) 00f1007600747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc560000016a16255b940000040300473045022100cb5ef2a6309526caf2ada65e066da48cac65a418d46b639859492a65913cebf002206488d928d432b4767b0d90aac629ec3a9f548c579a22963ef056509069527c2300770063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d0000016a16255bed0000040300483046022100f58cbb49096fef0ae253df6f119bc6d27028ff812bcece451281d4f941bf4477022100e3513b5e6b359c9037e4880b6b0eb069cb176958a6fd11b58657278d0a150cd3 . . . . [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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