www.zentek.com.br

Issued by R3

About this certificate

This digital certificate with serial number 03:9d:5b:71:07:60:3e:da:d2:c6:10:2c:88:30:3e:dd:d8:32 was issued on by Let's Encrypt.

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)

Certificate Subject

CN=www.zentek.com.br

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:9d:5b:71:07:60:3e:da:d2:c6:10:2c:88:30:3e:dd:d8:32
Serial Number (int): 314882736028631743922297033208352672176178
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 19:a2:b7:63:f7:36:fc:c6:db:48:57:9b:f4:06:43:de:d7:45:af:58
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): da:ae:cd:2a:fa:05:9f:24:ee:ec:5e:a4:1c:24:66:ae:32:4a:d6:c2
Fingerprint (sha256): 9e:94:f0:96:53:76:8b:bd:57:20:5b:26:61:0a:21:31:5c:18:59:9d:78:cd:3d:83:b6:54:53:31:0a:cd:da:49

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

Revocation information

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

Check the revocation status for certificate www.zentek.com.br

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.zentek.com.br

Public Key Algorithm

ECDSA

Key Size

256

Signature Algorithm

SHA256 with RSA

Key Usage

Digital Signature

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.zentek.com.br
zentek.com.br

Other certificates including the domain name zentek.com.br

(limited to 100 certificates)
sales.zentek.com.br
test.zentek.com.br
www.zentek.com.br
www.hugoguilherme.com
www.zentek.com.br
zentek.com.br
zentek.com.br
zentek.com.br
tekpro.zentek.com.br
www.junkdrawer.io
zentek.com.br
www.zentek.com.br
crm.wemade.dev
*.zentek.com.br
zentek.com.br
test.zentek.com.br
www.developer.bcregistry.daxiom.ca
tekpro.zentek.com.br
*.zentek.com.br
tekpro.zentek.com.br
matthewiannucci.com
www.ppsapplications.com
*.zentek.com.br
zentek.com.br
tekpro.zentek.com.br
www.zentek.com.br
zentek.com.br
zentek.com.br
rydpay.thinxcloud-staging.de
www.zentek.com.br
www.zentek.com.br
tekpro.zentek.com.br
bia-staging.noltech.co.za
zentek.com.br
www.benbellmann.com
test.zentek.com.br
www.zentek.com.br
www.zentek.com.br
www.uhladiku.cz
*.zentek.com.br
www.zentek.com.br
www.uhladiku.cz
zentek.com.br
*.zentek.com.br
test.zentek.com.br
www.zentek.com.br
metoda.app
*.zentek.com.br
mobile.energypager.com
www.zentek.com.br
aunclic.com
2022.bsjobedu.kr
www.bytecraft.in
bia-staging.noltech.co.za
zentek.com.br
www.teresaklaman.art

Certificate

The complete raw certificate details for www.zentek.com.br in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEUBqRD8+06jd9PMZVJp636HF02j1/
IGcJyPCm8ZWcnJ2kcJNJXhYMDKza6n7GgSgRBFaTxmhRPidqDdhw8qKILw==
-----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 314882736028631743922297033208352672176178
 . . . . . . . . [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 2023-02-26 10:56:35 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-05-27 10:56:34 +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 'www.zentek.com.br'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.10045.2.1 (ecPublicKey)
 . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.10045.3.1.7 (prime256v1)
 . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (520 bits)
				0004501a910fcfb4ea377d3cc655269eb7e87174da3d7f206709c8f0a6f1959c9c9da47093495e160c0cacdaea7ec6812811045693c668513e276a0dd870f2a2882f
 . . . . . . . . [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 (1 bits)
							0780
 . . . . . . . . . . . . . . . . [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)
							19a2b763f736fcc6db48579bf40643ded745af58
 . . . . . . . . . . . . . . . . [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 (36 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.zentek.com.br'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'zentek.com.br'
 . . . . . . . . . . . . . . . . [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 (69 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 1.3.6.1.4.1.11129.2.4.2
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f0007600b73efb24df9c4dba75f239c5ba58f46c5dfc42cf7a9f35c49e1d098125edb499000001868d94f6be000004030047304502205438163d830269f2a18b81974c20e73ca9569724ed714f88e7e07fa43248419202210089e722d580b2c8f15eab5f1be3e5648b4c0b3272441b0dab4b905426ef3d97440076007a328c54d8b72db620ea38e0521ee98416703213854d3bd22bc13a57a352eb52000001868d94f6db000004030047304502202da5f0893f2b41768f1d8a67af8514b34138c361bcb54c033f57540630803a4b022100e9e68e420325d57b1bc3c031798fa8939414bcab7e4d709f3035423aa32abb72
 . . . . [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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