kaczmarek.io

Issued by R3

About this certificate

This digital certificate with serial number 03:d3:86:0b:ca:73:32:26:c9:1a:1b:91:6f:ae:11:8e:bc:4b 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:
  • 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=kaczmarek.io

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:d3:86:0b:ca:73:32:26:c9:1a:1b:91:6f:ae:11:8e:bc:4b
Serial Number (int): 333314614988472878106844066621604651514955
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 56:5e:3f:30:eb:05:a2:fb:fe:e9:d3:68:6c:12:cf:4d:e9:be:38:eb
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 40:8f:0f:06:9c:67:c3:1b:d1:0b:ef:94:71:1b:79:78:63:7d:81:64
Fingerprint (sha256): d2:59:35:6f:c6:9a:b4:99:d2:9d:aa:1e:2e:50:47:ce:13:6e:55:02:e1:37:61:27:da:94:21:e2:2a:48:56:24

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

Revocation information

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

Check the revocation status for certificate kaczmarek.io

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for kaczmarek.io

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

*.kaczmarek.io
kaczmarek.io

Other certificates including the domain name kaczmarek.io

(limited to 100 certificates)
en.kaczmarek.io
en.kaczmarek.io
en.kaczmarek.io
en.kaczmarek.io
en.kaczmarek.io
en.kaczmarek.io
en.kaczmarek.io
en.kaczmarek.io
en.kaczmarek.io
en.kaczmarek.io
en.kaczmarek.io
en.kaczmarek.io
en.kaczmarek.io
en.kaczmarek.io
kaczmarek.io
kaczmarek.io
kaczmarek.io
en.kaczmarek.io
en.kaczmarek.io
en.kaczmarek.io
en.kaczmarek.io
en.kaczmarek.io

Certificate

The complete raw certificate details for kaczmarek.io 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 333314614988472878106844066621604651514955
 . . . . . . . . [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 2023-10-11 12:30:51 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-01-09 12:30:50 +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 'kaczmarek.io'
 . . . . . . . . [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 852608084652671309143785400340068672138194934984291995942216840065758480992869158887676148010343160424591396352370374744572455897733640238909957974769682634659344500860830993395114373750395072716417708504715047099938393514534164594152699802062231076195073367455345985952833243056048758801937189910373167275364861612566961215071727200546774548157724841542012166484787471473533788893746156606268841231095147946882387610387657763178390109019175842818367173647281746467428618695283929733581733805985806696159766031548875048085067801738130297388092669722902922997976189391261338881712460291899618708287873859091966867580281626931415490821150000803416354954145228779763425504579550671108134050593769975405211110516332862908039896601451721338700489324784980959238881271513278193818715494650648044136939928629285962351133275928848229962517471325394318329453984412854592018289794413156749089218624119144113136219101544342649000690068923335031870261615055307563769040928943566812665347677023609184848151697624454583538802159199428504245771104061693214674267311115678508543611948749489172188129920387518882595937075053886051148185426106104124442168682790921009292777432005031460035956791994673965775155491201363546311117921939182451993976239983
 . . . . . . . . . . . . . . . . . . . . [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)
							565e3f30eb05a2fbfee9d3686c12cf4de9be38eb
 . . . . . . . . . . . . . . . . [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 (32 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String '*.kaczmarek.io'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'kaczmarek.io'
 . . . . . . . . . . . . . . . . [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 1.3.6.1.4.1.11129.2.4.2
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (247 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (244 bytes)
							00f20077003b5377753e2db9804e8b305b06fe403b67d84fc3f4c7bd000d2d726fe1fad4170000018b1eeed8f80000040300483046022100e72744c76b1e6f04aeb196bb52c3bd5954d4a57a92d007bbc2a59bb0a9e916d8022100fcb47a028f58a38ed7796c3318c6e430b060cd4a0154d7d813528f813c7fed95007700eecdd064d5db1acec55cb79db4cd13a23287467cbcecdec351485946711fb59b0000018b1eeed8f10000040300483046022100cc7f21bc06d559dac2924c04ae8ecc6dfc7f766ead48b78086e71382c262b32b022100bb265acd77d2e4d26bdc443feaf2fc4d20d376f15555be3aa003db9f09ada29a
 . . . . [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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