gezondheidinbedrijf.nu

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:1b:67:cc:df:7f:f7:19:31:dd:d2:1b:d0:0c:b9:36:fd:71 was issued on by Let's Encrypt.

With 3 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=gezondheidinbedrijf.nu

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:1b:67:cc:df:7f:f7:19:31:dd:d2:1b:d0:0c:b9:36:fd:71
Serial Number (int): 270662455947386857402821391293265099554161
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 09:16:02:3f:a5:fa:5a:af:ef:6c:50:4e:07:e5:fa:88:53:f1:3b:c2
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 8f:6e:df:38:d9:d4:75:c4:62:4e:b7:63:71:f4:ac:32:fc:63:3e:9f
Fingerprint (sha256): f2:df:c4:c7:ea:6e:e5:ed:33:14:ea:ee:6b:74:cd:0f:2b:37:3a:82:b3:09:0b:72:18:cb:bf:04:7a:2c:c1:be

Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/

Revocation information

OCSP Server: http://ocsp.int-x3.letsencrypt.org

Check the revocation status for certificate gezondheidinbedrijf.nu

3

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for gezondheidinbedrijf.nu

Public Key Algorithm

RSA

Key Size

4096

Signature Algorithm

SHA256 with RSA

Key Usage

Digital Signature
Key Encipherment

Extended Key Usages

Server Authentication
Client Authentication

Extensions

8 extensions
No unhandled critical extensions

CA Certificate

This is not a CA certificate

Subject Alternative Names

gezondheidinbedrijf.nu
mail.gezondheidinbedrijf.nu
www.gezondheidinbedrijf.nu

Other certificates including the domain name gezondheidinbedrijf.nu

(limited to 100 certificates)

Certificate

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

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----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-----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 270662455947386857402821391293265099554161
 . . . . . . . . [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 2017-09-29 21:18:46 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2017-12-28 21:18:46 +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 'gezondheidinbedrijf.nu'
 . . . . . . . . [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 (4208 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 726502736637091449976868793698069899364880673547411202744988489764541488569411256022203196879622189264058532246304046783207592640323376294257570266717717687250278269808214504755643682793299636540213095302445328925165086913892107730608910600764971938543564028527996190407523115042512272747909835989178711669356009787685243451247342971103046952857680040900067220182364698345526104233239631684635878689368477951806423121741249113648987599397689244037099965763164718819803595819590929314404826330230383357431466661298678591939733640342350672690854492957588466684191400380111887744916486610321748718080447832980220023602408254911486094164974496710089733884872797581743212492666380774421375649491966318892051379486101644395578378756697817624644901074019840245873319399761372651904418148693081579709036789079547529048170062661184658428213540673625419679266785622539325440031270358851632806442911568586997556017866887796452099208241034948041604557787799563927500361773670147967710541445778283157327172623642396514796269431761664324948116563524529193155446970828757045239897739431389089293253229048701070786944636193352412336709896898869689040064803854293918976258748594339597671811992505251391476154121799129392613610645699155474039051076831
 . . . . . . . . . . . . . . . . . . . . [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)
							0916023fa5fa5aafef6c504e07e5fa8853f13bc2
 . . . . . . . . . . . . . . . . [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 (83 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'gezondheidinbedrijf.nu'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.gezondheidinbedrijf.nu'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.gezondheidinbedrijf.nu'
 . . . . . . . . . . . . . . . . [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 (246 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 1.3.6.1.5.5.7.2.2 (unotice)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:12|false] UTF8String 'This Certificate may only be relied upon by Relying Parties and only in accordance with the Certificate Policy found at https://letsencrypt.org/repository/'
 . . . . [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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