www.novatours.lv

Issued by RapidSSL SHA256 CA

About this certificate

This digital certificate with serial number 60:90:21:ab:05:78:09:cc:b5:b1:34:fc:fb:d0:f5:a9 was issued on by GeoTrust Inc..

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)
  • Sub certificates SHOULD include Subject Key Identifier in end entity certs (RFC 5280: 4.2 & 4.2.1.2)

Certificate Subject

CN=www.novatours.lv

GeoTrust Inc.

Organization: GeoTrust Inc.
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 60:90:21:ab:05:78:09:cc:b5:b1:34:fc:fb:d0:f5:a9
Serial Number (int): 128354261212206191846586509574676739497
Serial Number lenght: 127 bits, 16 octets

SubjectKeyId:
AuthorityKeyId: 97:c2:27:50:9e:c2:c9:ec:0c:88:32:c8:7c:ad:e2:a6:01:4f:da:6f

Fingerprint (sha1): ca:99:4b:8c:0b:f3:0f:5a:39:bd:31:97:32:b4:e9:33:4e:0e:c7:ea
Fingerprint (sha256): 48:d6:50:ab:b9:19:bc:f4:04:b0:a7:8e:8d:4c:91:c7:df:96:11:be:d5:da:01:3b:6a:d9:ed:a1:93:98:b1:29

Issuing Certificate URL: http://gp.symcb.com/gp.crt

Revocation information

OCSP Server: http://gp.symcd.com
CRL Distribution Point: http://gp.symcb.com/gp.crl

Check the revocation status for certificate www.novatours.lv

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.novatours.lv

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

www.novatours.lv
novatours.lv

Other certificates including the domain name novatours.lv

(limited to 100 certificates)
beta.novatours.lv
beta.novatours.lv
m.novatours.lv
beta.novatours.lv
mollerauto.lv
www.novatours.lv
m.novatours.lv
www.novatours.lv
www.novatours.lv
m.novatours.lv
novatours.lv
www.novatours.lv
www.novatours.lv
beta.novatours.lv
www.novatours.lv
beta.novatours.lv
novatours.lv
m.novatours.lv
mollerauto.lv
mollerauto.lv
www.novatours.lv
beta.novatours.lv
m.novatours.lv
www.novatours.lv
www.novatours.lv
beta.novatours.lv
www.novatours.lv
beta.novatours.lv
www.novatours.lv
beta.novatours.lv
novatours.lv
beta.novatours.lv
beta.novatours.lv
mollerauto.lv
mollerauto.lv
mollerauto.lv
beta.novatours.lv
beta.novatours.lv
www.novatours.lv
m.novatours.lv
www.novatours.lv
www.novatours.lv
beta.novatours.lv
mollerauto.lv
mollerauto.lv
beta.novatours.lv
m.novatours.lv
mollerauto.lv

Certificate

The complete raw certificate details for www.novatours.lv in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----
MIIFcTCCBFmgAwIBAgIQYJAhqwV4Ccy1sTT8+9D1qTANBgkqhkiG9w0BAQsFADBC
MQswCQYDVQQGEwJVUzEWMBQGA1UEChMNR2VvVHJ1c3QgSW5jLjEbMBkGA1UEAxMS
UmFwaWRTU0wgU0hBMjU2IENBMB4XDTE2MDkwNTAwMDAwMFoXDTE3MTEwNDIzNTk1
OVowGzEZMBcGA1UEAwwQd3d3Lm5vdmF0b3Vycy5sdjCCASIwDQYJKoZIhvcNAQEB
BQADggEPADCCAQoCggEBAMhz7OQyUJVfLqXNxTB4msTAhzSY0ePZpDB+g818iurU
Jyt9ybziX86lp1MEP+vly86XxGJfB48wOVdTVBaUOnz6O3q1lF/ICAUwfmYuBafY
7MgFNk1HXSNQVVtFJ9vZSMedLwKbxso9eUbH0SdFrbr5O0TGYruG4v/CfTg9nUC3
oDmgyNZyfca1fUGgNr6j7NVO80X4zxlRJ/LZ6HBthU17zzESkoPcsS1lcE75F9MJ
VVNnzpJRL+1AnSAEao5j1b6O9c/NXLsdvzT496w+WZYTAAgZdWsakZGtgpZAXFj7
W2F+a1lRe+vsA52SwqSXg0qgtfCoHqVceDAWmipYa/sCAwEAAaOCAogwggKEMCkG
A1UdEQQiMCCCEHd3dy5ub3ZhdG91cnMubHaCDG5vdmF0b3Vycy5sdjAJBgNVHRME
AjAAMCsGA1UdHwQkMCIwIKAeoByGGmh0dHA6Ly9ncC5zeW1jYi5jb20vZ3AuY3Js
MG8GA1UdIARoMGYwZAYGZ4EMAQIBMFowKgYIKwYBBQUHAgEWHmh0dHBzOi8vd3d3
LnJhcGlkc3NsLmNvbS9sZWdhbDAsBggrBgEFBQcCAjAgDB5odHRwczovL3d3dy5y
YXBpZHNzbC5jb20vbGVnYWwwHwYDVR0jBBgwFoAUl8InUJ7CyewMiDLIfK3ipgFP
2m8wDgYDVR0PAQH/BAQDAgWgMB0GA1UdJQQWMBQGCCsGAQUFBwMBBggrBgEFBQcD
AjBXBggrBgEFBQcBAQRLMEkwHwYIKwYBBQUHMAGGE2h0dHA6Ly9ncC5zeW1jZC5j
b20wJgYIKwYBBQUHMAKGGmh0dHA6Ly9ncC5zeW1jYi5jb20vZ3AuY3J0MIIBAwYK
KwYBBAHWeQIEAgSB9ASB8QDvAHUA3esdK3oNT6Ygi4GtgWhwfi6OnQHVXIiNPRHE
zbbsvswAAAFW+7ca9QAABAMARjBEAiB37xMugd1lkvwZXgcZXkg368qB/d5k3/U5
EsQGIO2m6gIgEMwBBlSekOOGFVsuVhfMbU9pKNAMpnDiODVge+Q1orQAdgCkuQmQ
tBhYFIe7E6LMZ3AKPDWYBPkb37jjd80OyA3cEAAAAVb7txw1AAAEAwBHMEUCIDHL
K5rol6u5aKsw3NWhgyNo7p9AsUnncHFfkTAuzut3AiEAqmHD1VWoNwAT/CvXi3ZE
fLXMKpEeRfzduDf0bgFM0tIwDQYJKoZIhvcNAQELBQADggEBALN4zEcd4RYitV9h
M6xsSCqaK+r/fUtm4i3SOVO2acFRWsVYN8Gf5zZPLIQZfAmqnhDuEkYXL1VPt+61
tEdq9Y5tAr2R9FZgZdH4YNJZmDwLSa3nxW5lQ7xbPeDbr1vAYBjCAK0Jh6wThmga
MfUCWCRIX6eCvFJasDI5RuE4HPX1oryqorTfAdKtF8LlsX9Z54GXrQMrVS4/k3WC
IHo0FEATPz5mzeRW0oUnFL9B5mcv8vHGq348b+yTTi581X31UyW+qjxZR5YCCFwa
TJvVIIqcTbkZzqmtiCjvEIqLqMomorW/929L7KcpohUfneUXTO4PFHjkQp2OUzNT
nLpK9LM=
-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyHPs5DJQlV8upc3FMHia
xMCHNJjR49mkMH6DzXyK6tQnK33JvOJfzqWnUwQ/6+XLzpfEYl8HjzA5V1NUFpQ6
fPo7erWUX8gIBTB+Zi4Fp9jsyAU2TUddI1BVW0Un29lIx50vApvGyj15RsfRJ0Wt
uvk7RMZiu4bi/8J9OD2dQLegOaDI1nJ9xrV9QaA2vqPs1U7zRfjPGVEn8tnocG2F
TXvPMRKSg9yxLWVwTvkX0wlVU2fOklEv7UCdIARqjmPVvo71z81cux2/NPj3rD5Z
lhMACBl1axqRka2ClkBcWPtbYX5rWVF76+wDnZLCpJeDSqC18KgepVx4MBaaKlhr
+wIDAQAB
-----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 128354261212206191846586509574676739497
 . . . . . . . . [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 'GeoTrust Inc.'
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3 (commonName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'RapidSSL SHA256 CA'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2016-09-05 00:00:00 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2017-11-04 23:59:59 +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:12|false] UTF8String 'www.novatours.lv'
 . . . . . . . . [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 25304825917315753398515045053685890682607056657598551915951766460865309739935210925147704069673605085087589937442562822975646450038517919124638976252128885471863522627262936941448558386724831082446412764208637767475448181973482516749387623059422304413815839988433231914949095329178571859860649323273424215036692672956265014009217685050343213919702051858665143131753551231647642934630450991533770701143551358596727714797061196917360482394811376536095095467500641425318414261900501139544966311019163754613112058426878587326566988940785627520327708014963544788630174461489965761293570071870654381623793131675670290131963
 . . . . . . . . . . . . . . . . . . . . [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 2.5.29.17 (subjectAltName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (34 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.novatours.lv'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'novatours.lv'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.19 (basicConstraints)
 . . . . . . . . . . . . . . . . . . . . [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 2.5.29.31 (cRLDistributionPoints)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (36 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://gp.symcb.com/gp.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 (104 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: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 'https://www.rapidssl.com/legal'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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 'https://www.rapidssl.com/legal'
 . . . . . . . . . . . . . . . . [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 97c227509ec2c9ec0c8832c87cade2a6014fda6f
 . . . . . . . . . . . . . . . . [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 1.3.6.1.5.5.7.1.1 (authorityInfoAccess)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (75 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://gp.symcd.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://gp.symcb.com/gp.crt'
 . . . . . . . . . . . . . . . . [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)
							00ef007500ddeb1d2b7a0d4fa6208b81ad8168707e2e8e9d01d55c888d3d11c4cdb6ecbecc00000156fbb71af50000040300463044022077ef132e81dd6592fc195e07195e4837ebca81fdde64dff53912c40620eda6ea022010cc0106549e90e386155b2e5617cc6d4f6928d00ca670e23835607be435a2b4007600a4b90990b418581487bb13a2cc67700a3c359804f91bdfb8e377cd0ec80ddc1000000156fbb71c350000040300473045022031cb2b9ae897abb968ab30dcd5a1832368ee9f40b149e770715f91302eceeb77022100aa61c3d555a8370013fc2bd78b76447cb5cc2a911e45fcddb837f46e014cd2d2
 . . . . [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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