invoice.oseogroup.com

Issued by R3

About this certificate

This digital certificate with serial number 04:68:20:cf:cf:f9:7f:e7:d6:6c:17:c9:90:1f:64:b5:da:ee was issued on by Let's Encrypt.

With 18 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:
  • 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=invoice.oseogroup.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:68:20:cf:cf:f9:7f:e7:d6:6c:17:c9:90:1f:64:b5:da:ee
Serial Number (int): 383882124206359606096578214196306932783854
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 68:75:e3:4a:ca:d6:16:4b:35:72:9f:1d:0d:b2:d3:81:52:48:a7:62
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): e0:fa:da:cf:d1:bb:7c:80:30:e1:b5:b2:b1:0e:a0:73:93:18:ab:a5
Fingerprint (sha256): 1b:58:c5:96:8b:bf:35:5d:0f:5e:21:82:d6:ac:7a:72:5d:4d:24:f4:cb:cf:80:bf:91:8f:51:f5:b1:97:8b:82

Issuing Certificate URL: http://r3.i.lencr.org/

Revocation information

OCSP Server: http://r3.o.lencr.org

Check the revocation status for certificate invoice.oseogroup.com

18

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for invoice.oseogroup.com

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

accounting.getprintbox.com
accounts.semtek.co.uk
client.tagexpert.fr
invoice.3distrib.fr
invoice.ageri.no
invoice.alexandros.blue
invoice.britishsurgeryoflanzarote.com
invoice.dymasco.com
invoice.eastwoodenglish.com
invoice.inlovemary.de
invoice.oseogroup.com
invoice.trancelabinstitute.com
invoices.makeitsolid.be
payments.crackinevents.co.uk
payments.lsbu.cambridgeonlinelearning.com
payments.online.plymouth.ac.uk
portail.mgi.digital
yourspace.optics-depot.com

Other certificates including the domain name oseogroup.com

(limited to 100 certificates)
invoice.oseogroup.com
bookings.valyant.co
session.oscar-coach.com
oseogroup.com

Certificate

The complete raw certificate details for invoice.oseogroup.com in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtSGB1qIM6qYIAmQaTzyL
5RAQYBEomy8w5g3+PfOyqTxxgSLPbPO2CW+Z5QqxfWEJRsd3WEJ+mQNKjOIxDF4p
2z2lIhnHSbBp6thZkI7Q5pS4fYBsxY/nakMze7T9fdXn9WwxZsG+mLHbz4UYOzyh
CIDITe/nGTqeg/QILGhSob5Lof1UKHmS9wDp2fNbhVT3YT3F+/lMVh44AUs4q/cd
QwDU93JpU+euC6ol7CUyB6Bb8ZQRS/O7CXJteOK/sWnz3V7Sb6MJsRAo2ODg+frY
YRGd1snCZVGQU6XsIriq2URbBruBMIcXuIZT91Mf5Ss3qxcb7jbEvcWWAkgw4AGZ
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 383882124206359606096578214196306932783854
 . . . . . . . . [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 'R3'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-04-03 19:22:47 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-07-02 19:22:46 +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 'invoice.oseogroup.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 22865656205771521609772252277699711291915179910890404092229738901399716962354234919025463699176813019057832986863275402858791854683855728521954801740488262957232756106581126923232662015804239343332254568477978704746855237020508393160436410992972713211997860927114207677100309662372683597702499837749021255722065867325580949717322471515259239717951583775193429448788904683159449430908717904460408356044392134256596080507793678900754558731589836578948890939371463845734288569749521256354982371631290709444201999667376613982348878576226602826543471660063614290263739021660040096480981272379755012800625988317729043618183
 . . . . . . . . . . . . . . . . . . . . [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)
							6875e34acad6164b35729f1d0db2d3815248a762
 . . . . . . . . . . . . . . . . [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 142eb317b75856cbae500940e61faf9d8b14c2c6
 . . . . . . . . . . . . . . . . [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 (73 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://r3.o.lencr.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://r3.i.lencr.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 (486 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'accounting.getprintbox.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'accounts.semtek.co.uk'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'client.tagexpert.fr'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'invoice.3distrib.fr'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'invoice.ageri.no'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'invoice.alexandros.blue'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'invoice.britishsurgeryoflanzarote.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'invoice.dymasco.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'invoice.eastwoodenglish.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'invoice.inlovemary.de'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'invoice.oseogroup.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'invoice.trancelabinstitute.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'invoices.makeitsolid.be'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'payments.crackinevents.co.uk'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'payments.lsbu.cambridgeonlinelearning.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'payments.online.plymouth.ac.uk'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'portail.mgi.digital'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'yourspace.optics-depot.com'
 . . . . . . . . . . . . . . . . [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 (12 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 1.3.6.1.4.1.11129.2.4.3 (CT Precertificate Poison)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (2 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:5|false] NULL 
 . . . . [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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