meuzik.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:e3:ab:f6:72:42:50:5e:d3:e7:6c:35:1c:a9:5a:d2:7c:42 was issued on by Let's Encrypt.

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=meuzik.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:e3:ab:f6:72:42:50:5e:d3:e7:6c:35:1c:a9:5a:d2:7c:42
Serial Number (int): 338809532696088818310653852832180856847426
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 3e:26:42:48:a6:c7:66:9c:5e:f0:4e:84:f6:35:8c:3f:e1:29:a4:7a
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): bd:ac:9e:71:b0:fa:93:6d:42:33:e7:23:e7:cd:8f:5e:f2:d7:ff:f5
Fingerprint (sha256): 49:a7:66:e9:48:ba:69:5f:75:ad:b9:c3:a5:37:de:c8:91:78:45:f7:1b:c9:bb:63:a2:c7:4a:b3:a4:c8:c8:1b

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 meuzik.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for meuzik.com

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

9 extensions
No unhandled critical extensions

CA Certificate

This is not a CA certificate

Subject Alternative Names

meuzik.com

Other certificates including the domain name meuzik.com

(limited to 100 certificates)
meuzik.com
meuzik.com
meuzik.com
meuzik.com
meuzik.com
meuzik.com
meuzik.com
meuzik.com
meuzik.com
meuzik.com

Certificate

The complete raw certificate details for meuzik.com 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 338809532696088818310653852832180856847426
 . . . . . . . . [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 2019-04-04 03:15:54 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-07-03 03:15:54 +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 'meuzik.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 (4208 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 897230059681680758697886709990599362501481453190035375131011218187747364755108054595086930191970850993866292182608169131971616728659163749641069444999748159395731897088214064716200794612207351076137177339621939895834049311883471120506053486541115882424994377282836568690594688703420196936880575980435324890589178788053958194066330414049357123247531421063061989872850545283156359169881682287605107985265872816801367534836695251739888734923464403048660705860070618587405705434080808217491785704638943322920429111163537137792193838811023529996139830832730103853753671711709351119919672759656033235499210558923206449771993140889860479226544502758255644774043327777919833827132712104674471627115141077207009830312629702955811162234850508259287179620669860366003746046720024914254995960582758345139777837629689933580318594064566259749561427555444061224341009322871839396918146658424316973221602674054274389672733774429156665174728033219970707970473586584116511452329279352106053166182445858969723264466312364881274844972381106905752147028069294643042992873872661541787167489167065397234125466536079312911245302770572288162642991232537726607984819050080046994599844869943122894000826620362203848007410760861300293935380510757640257782896023
 . . . . . . . . . . . . . . . . . . . . [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)
							3e264248a6c7669c5ef04e84f6358c3fe129a47a
 . . . . . . . . . . . . . . . . [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 (14 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'meuzik.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 (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)
							00f0007500293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f47800000169e68f72090000040300463044022075b3b0fb920c3b930a8362962cdeda1deded4c82f49921e9126df8a472e4218d0220643f055d4ac43639e9811f87ce02a8dc8679ee7b573cf81527a813f384d333f8007700e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe00000169e68f73850000040300483046022100c6e0064346c378d5ce2bd7ef022ec992a2df5796f2dc9328fce2dde87fd8e545022100906bd90718665121597f1461359f6363fd915c8622abed029622b7b759042eb5
 . . . . [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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