*.notarypublicamerica.com

Issued by Starfield Secure Certification Authority

About this certificate


This digital certificate with serial number 27:8c:17:40:2c:74:ea was issued on by Starfield Technologies, Inc. .

With 2 subject alternative names this certificate can be used to secure multiple fqdn's. While the 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.

Cerificate errors/warnings *beta

  • ERROR: localityName or stateOrProvinceName is required if organizationName is set
  • ERROR: stateOrProvinceName is required if organizationName is set
  • ERROR: countryName is required if organizationName is set

*.notarypublicamerica.com

Organization: *.notarypublicamerica.com
Organization unit: Domain Control Validated

Starfield Technologies, Inc.

Company registration number: 10688435
Organization: Starfield Technologies, Inc.
Organization unit: http://certificates.starfieldtech.com/repository

Time since certificate expired

This certificate has expire since

Certificate Details

Serial Number (hex): 27:8c:17:40:2c:74:ea
Serial Number (int): 11131555580507370
Serial Number lenght: 54 bits, 7 octets

SubjectKeyId: 02:4d:96:b8:96:ef:36:02:e5:4c:e5:61:99:eb:03:71:01:32:4a:d4
AuthorityKeyId: 49:4b:52:27:d1:1b:bc:f2:a1:21:6a:62:7b:51:42:7a:8a:d7:d5:56

Fingerprint (sha1): a1:f2:be:69:f5:e6:a3:7e:ac:a3:d3:ff:04:23:c5:1f:bf:17:9d:a3
Fingerprint (sha256): 44:f1:7f:d3:e8:e0:1e:de:9a:01:34:c5:aa:38:11:30:18:e7:94:d4:24:fc:91:b9:2e:24:29:72:61:7a:1a:2b

Issuing Certificate URL: http://certificates.starfieldtech.com/repository/sf_intermediate.crt

Revocation information

OCSP Server: http://ocsp.starfieldtech.com/
CRL Distribution Point: http://crl.starfieldtech.com/sfs1-23.crl

Check the revocation status for the current certificate on *.notarypublicamerica.com
2
DNS Names
0
Email Addresses
0
IP Addresses

Advanced Certificate Properties

Technical details about this certificate


Public Key Algorithm

RSA

Key Size

2048

Signature Algorithm

SHA1 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

*.notarypublicamerica.com
notarypublicamerica.com

Certificate

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

Certificate (PEM)

-----BEGIN CERTIFICATE----- MIIFtDCCBJygAwIBAgIHJ4wXQCx06jANBgkqhkiG9w0BAQUFADCB3DELMAkGA1UE BhMCVVMxEDAOBgNVBAgTB0FyaXpvbmExEzARBgNVBAcTClNjb3R0c2RhbGUxJTAj BgNVBAoTHFN0YXJmaWVsZCBUZWNobm9sb2dpZXMsIEluYy4xOTA3BgNVBAsTMGh0 dHA6Ly9jZXJ0aWZpY2F0ZXMuc3RhcmZpZWxkdGVjaC5jb20vcmVwb3NpdG9yeTEx MC8GA1UEAxMoU3RhcmZpZWxkIFNlY3VyZSBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0 eTERMA8GA1UEBRMIMTA2ODg0MzUwHhcNMTIxMTExMjAwNzM4WhcNMTMxMTExMjAw NzM4WjBrMSIwIAYDVQQKDBkqLm5vdGFyeXB1YmxpY2FtZXJpY2EuY29tMSEwHwYD VQQLExhEb21haW4gQ29udHJvbCBWYWxpZGF0ZWQxIjAgBgNVBAMMGSoubm90YXJ5 cHVibGljYW1lcmljYS5jb20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIB AQC2HkukvNLRLGKhCoIK1cWrld4ExNwxXxVbD4+9+KPhuAmSapYBEz7FXG6k6syd ukW20NfY0ZTgKTplBu8bfliKSIJ9CS5tRsZOoCFjw6CyQsxNCpzM5887X3gMop4Q Cy2q6RgU1/xPnPbn8aTlNvo0cpdfShaEoGf8hGd6uP/yfTWytQhfOmDVNEo4Zhes tIgeJ6Mw1XR0a2vC8kW/rM+QM3Yr5JB/LKA0E7U3V+/kapNOPpK1QaEDZyqePiD8 nzXLgj0vNmXnO2/H8+Y2ykoX1xcWgTWenSrtPslyy1hhOHjPfntKBg21XeoqdRsM 6tp2VZ3duLPszcNo9GIq2LbvAgMBAAGjggHpMIIB5TAPBgNVHRMBAf8EBTADAQEA MB0GA1UdJQQWMBQGCCsGAQUFBwMBBggrBgEFBQcDAjAOBgNVHQ8BAf8EBAMCBaAw OQYDVR0fBDIwMDAuoCygKoYoaHR0cDovL2NybC5zdGFyZmllbGR0ZWNoLmNvbS9z ZnMxLTIzLmNybDBZBgNVHSAEUjBQME4GC2CGSAGG/W4BBxcBMD8wPQYIKwYBBQUH AgEWMWh0dHA6Ly9jZXJ0aWZpY2F0ZXMuc3RhcmZpZWxkdGVjaC5jb20vcmVwb3Np dG9yeS8wgY0GCCsGAQUFBwEBBIGAMH4wKgYIKwYBBQUHMAGGHmh0dHA6Ly9vY3Nw LnN0YXJmaWVsZHRlY2guY29tLzBQBggrBgEFBQcwAoZEaHR0cDovL2NlcnRpZmlj YXRlcy5zdGFyZmllbGR0ZWNoLmNvbS9yZXBvc2l0b3J5L3NmX2ludGVybWVkaWF0 ZS5jcnQwHwYDVR0jBBgwFoAUSUtSJ9EbvPKhIWpie1FCeorX1VYwPQYDVR0RBDYw NIIZKi5ub3RhcnlwdWJsaWNhbWVyaWNhLmNvbYIXbm90YXJ5cHVibGljYW1lcmlj YS5jb20wHQYDVR0OBBYEFAJNlriW7zYC5UzlYZnrA3EBMkrUMA0GCSqGSIb3DQEB BQUAA4IBAQAWPMzyuK7BDqZJ34fEOWnaUKw/CPRHBQ1LCD3ryZoDULZn8UKSrTbV akuV4OF4rvmXmuYsbFyZ9EB9RVqu+1MPPrAOlDgQ3WBucWYJlphN9sAS3MAuJmhR HEx67VGZ/49Bm4giVeXRL3peSYSEC5nqRCt1liMlYsUmRAw0epNxyTouh0ZyLmgP Lhh2W5yt6Lv41ZptXD3qhNfTQjz/JfZ/hKp+4Iu+Ymfcwmg0hiE2Nz92MR+ERene 1zWjW9bahPboUW0N5ow3PH6vlcp5tI93PO8xKZ3ICNU8JCrYyALzhg6nv85p0Zfd PpncCZ9xaberCp6SaQzJUm5BqhHq3Bat -----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAth5LpLzS0SxioQqCCtXF q5XeBMTcMV8VWw+Pvfij4bgJkmqWARM+xVxupOrMnbpFttDX2NGU4Ck6ZQbvG35Y ikiCfQkubUbGTqAhY8OgskLMTQqczOfPO194DKKeEAstqukYFNf8T5z25/Gk5Tb6 NHKXX0oWhKBn/IRnerj/8n01srUIXzpg1TRKOGYXrLSIHiejMNV0dGtrwvJFv6zP kDN2K+SQfyygNBO1N1fv5GqTTj6StUGhA2cqnj4g/J81y4I9LzZl5ztvx/PmNspK F9cXFoE1np0q7T7JcstYYTh4z357SgYNtV3qKnUbDOradlWd3biz7M3DaPRiKti2 7wIDAQAB -----END PUBLIC KEY-----

ASN1 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 11131555580507370 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.5 (sha1WithRSAEncryption) . . . . . . . . . . . . [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 2.5.4.8 (stateOrProvinceName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Arizona' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.7 (localityName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Scottsdale' . . . . . . . . . . . . [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 'Starfield Technologies, Inc.' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.11 (organizationalUnitName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'http://certificates.starfieldtech.com/repository' . . . . . . . . . . . . [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 'Starfield Secure Certification Authority' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.5 (serialNumber) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString '10688435' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2012-11-11 20:07:38 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2013-11-11 20:07:38 +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 2.5.4.10 (organizationName) . . . . . . . . . . . . . . . . . . . . [c:0|t:12|false] UTF8String '*.notarypublicamerica.com' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.11 (organizationalUnitName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Domain Control Validated' . . . . . . . . . . . . [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:12|false] UTF8String '*.notarypublicamerica.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 22990310763010687788031795659196328078806594780842912946097454859618647650109286820783889591254783388732689015507076582830785216366902222227133639491583956897995517480808298579352315924854472498063761308584592067542188704648601649810424031322546671827087662260681227951990873624972443904218746652910241713874938341413500107931363382939526294472326642497068696760737815861273800936109339430979611475774634835465148160605165961138556898992045507560916371224896130838519722053613230372582152340831127990563316168863170283828787994066224960089958743838785691048941138215676147271445715051621825034138029849767576992265967 . . . . . . . . . . . . . . . . . . . . [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 2.5.29.19 (basicConstraints) . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (5 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN false . . . . . . . . . . . . . . . . [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 2.5.29.15 (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 2.5.29.31 (cRLDistributionPoints) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (50 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://crl.starfieldtech.com/sfs1-23.crl' . . . . . . . . . . . . . . . . [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 (82 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.16.840.1.114414.1.7.23.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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://certificates.starfieldtech.com/repository/' . . . . . . . . . . . . . . . . [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 (128 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.starfieldtech.com/' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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://certificates.starfieldtech.com/repository/sf_intermediate.crt' . . . . . . . . . . . . . . . . [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 494b5227d11bbcf2a1216a627b51427a8ad7d556 . . . . . . . . . . . . . . . . [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 '*.notarypublicamerica.com' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'notarypublicamerica.com' . . . . . . . . . . . . . . . . [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) 024d96b896ef3602e54ce56199eb037101324ad4 . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.5 (sha1WithRSAEncryption) . . . . . . . . [c:0|t:5|false] NULL . . . . [c:0|t:3|false] BIT STRING (2048 bits) 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