ionto.de

Issued by GTS CA 1P5

About this certificate

This digital certificate with serial number 39:d2:83:6a:45:d2:88:7e:13:70:70:85:fa:09:2e:9a was issued on by Google Trust Services LLC.

With 2 subject alternative names this certificate can be used to secure multiple fqdn's. This certificate is currently not expired, we haven't checked the revocation status of this certificate but you can do this simply on revocationcheck.com. 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:
  • DV certificate contains a subject common name, this is not recommended. If certificate policy 2.23.140.1.2.1 (CA/B BR domain validated) is included, only country and/or common name is allowed in SubjectDN. (BRs: 7.1.2.7.2)
  • Subscriber certificates use of Subject Key Identifier is NOT RECOMMENDED (BRs v2: 7.1.2.7.6)
  • Subscriber Certificate: commonName is NOT RECOMMENDED. (BRs: 7.1.2.7.1)

Certificate Subject

CN=ionto.de

Google Trust Services LLC

Organization: Google Trust Services LLC
Country: US

This certificate will expire on

Certificate Details

Serial Number (hex): 39:d2:83:6a:45:d2:88:7e:13:70:70:85:fa:09:2e:9a
Serial Number (int): 76859043515484808105677777303383912090
Serial Number lenght: 126 bits, 16 octets

SubjectKeyId: 21:e2:d3:78:51:e3:c6:bd:08:a6:de:f1:55:98:13:17:bb:0e:68:16
AuthorityKeyId: d5:fc:9e:0d:df:1e:ca:dd:08:97:97:6e:2b:c5:5f:c5:2b:f5:ec:b8

Fingerprint (sha1): d8:8c:0d:db:7b:ba:95:7e:a2:66:ee:70:e8:c0:4e:7b:e0:d5:a5:dd
Fingerprint (sha256): a8:3d:a2:b6:5b:51:28:a5:8d:c9:15:42:26:1f:ba:9b:c1:b5:87:0b:60:6c:72:45:fa:7c:0b:21:3b:ae:c6:5c

Issuing Certificate URL: http://pki.goog/repo/certs/gts1p5.der

Revocation information

OCSP Server: http://ocsp.pki.goog/s/gts1p5/orOWLNollhA
CRL Distribution Point: http://crls.pki.goog/gts1p5/Y2OZ-JdU1ic.crl

Check the revocation status for certificate ionto.de

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for ionto.de

Public Key Algorithm

RSA

Key Size

2048

Signature Algorithm

SHA256 with RSA

Key Usage

Digital Signature
Key Encipherment

Extended Key Usages

Server Authentication

Extensions

10 extensions
No unhandled critical extensions

CA Certificate

This is not a CA certificate

Subject Alternative Names

ionto.de
*.ionto.de

Other certificates including the domain name ionto.de

(limited to 100 certificates)
shop.ionto.de
ionto.de
*.ionto.de
ionto.de
shop.ionto.de
shop.ionto.de
shop.ionto.de
shop.ionto.de
ionto.de
ionto.de
ionto.de
ionto.de
shop.ionto.de
ionto.de
shop.ionto.de
ionto.de
ionto.de
ionto.de
mollerauto.lv
shop.ionto.de
ionto.de
ionto.de
www.ionto.de
shop.ionto.de
ionto.de
ionto.de
shop.ionto.de
ionto.de
*.ionto.de
mollerauto.lv
mollerauto.lv
shop.ionto.de
ionto.de
ionto.de
mollerauto.lv
shop.ionto.de
ionto.de
ionto.de
shop.ionto.de
shop.ionto.de
ionto.de
shop.ionto.de
ionto.de
ionto.de
*.ionto.de
ionto.de
ionto.de
shop.ionto.de
ionto.de
mollerauto.lv
ionto.de
shop-wartung.ionto.de
ionto.de
ionto.de
ionto.de
shop.ionto.de
mollerauto.lv
*.ionto.de
ionto.de
mollerauto.lv
shop-wartung.ionto.de
shop.ionto.de
mollerauto.lv
*.ionto.de
ionto.de
shop.ionto.de
shop.ionto.de
ionto.de
*.ionto.de
shop.ionto.de
ionto.de
mollerauto.lv
ionto.de
shop.ionto.de
mollerauto.lv
mollerauto.lv
mollerauto.lv

Certificate

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

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAst0KnsGZIyF1pofo1diN
Kb/3che5ZI6742i6XSu8v+vsIdg7cBrpQWLxcmyWGINfAwRFDo/IApc8ciGAk4fT
IKUYQYhEMS87TCnqbcoZM7Pc7/wuVEM8W1clulzyeM17ChcliISKj/vtOYiAkti4
Yi6lFoZXvJKn2+a6okS1TIxzd+zvEHyoTRAzkzvJiso2fnQI8KjtrbhWu0fH88Hh
Sd1/CLtITEpTK425glzrJsm8cP5Qi3QW13QngAC914jS4TVVyImkbLhrP5dCeg27
OKiuuF25jgM06tiD8WmI++amSb/vlQdEx1Wb5bh9QxnoJJRWIAiCxtRrazKF395c
hwIDAQAB
-----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 76859043515484808105677777303383912090
 . . . . . . . . [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 'Google Trust Services LLC'
 . . . . . . . . . . . . [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 'GTS CA 1P5'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-04-16 19:00:10 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-07-15 19:00:09 +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 'ionto.de'
 . . . . . . . . [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 22579417902647865478495053524108794735653241413092916418422611541169007699486219410139667031937710193636810879357020559916715687896630060229873069725073549160818230713381440200324533705337134433824979097944107094890864316752396583660412360110267346960698145589670625102604779583418752081855449994743695637770176961953533267518555510118636497712825933839939423134102923247989757130173605456030648895011236568591878779147121122869678988600744866114848905244726704759385755578150546054375882687595360787121104982068687706081650213199967017188970161612494797861223404453576650579841146898914589394510294526121923357596807
 . . . . . . . . . . . . . . . . . . . . [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 (12 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: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)
							21e2d37851e3c6bd08a6def155981317bb0e6816
 . . . . . . . . . . . . . . . . [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 d5fc9e0ddf1ecadd0897976e2bc55fc52bf5ecb8
 . . . . . . . . . . . . . . . . [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 (108 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.pki.goog/s/gts1p5/orOWLNollhA'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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://pki.goog/repo/certs/gts1p5.der'
 . . . . . . . . . . . . . . . . [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 (24 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'ionto.de'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String '*.ionto.de'
 . . . . . . . . . . . . . . . . [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 (26 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 1.3.6.1.4.1.11129.2.5.3
 . . . . . . . . . . . . . . . . [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 (53 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://crls.pki.goog/gts1p5/Y2OZ-JdU1ic.crl'
 . . . . . . . . . . . . . . . . [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)
							00f0007600eecdd064d5db1acec55cb79db4cd13a23287467cbcecdec351485946711fb59b0000018ee87edaa300000403004730450221008e397fcd29dd4c015b6bd774ef31ad74c219b030915df8262f90053ffdd2a0b2022018f192efc8bc1d11c6f632a62da4836b105729aa3f70ed683713ca61f42e9946007600dab6bf6b3fb5b6229f9bc2bb5c6be87091716cbb51848534bda43d3048d7fbab0000018ee87edaf30000040300473045022100defdb9fb7ab6a851b4082a0ead5c00ac39931bb04f722d9d5339d4e2c4af5c65022063b741296c9748501042a8758d0264f51a8c30310eef614bdb1d57acf3ee7082
 . . . . [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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