catalog.fi

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:a0:a7:49:7a:ab:ce:55:df:46:0a:a1:08:d9:a1:67:0f:e3 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=catalog.fi

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:a0:a7:49:7a:ab:ce:55:df:46:0a:a1:08:d9:a1:67:0f:e3
Serial Number (int): 316004399103663493247744075647910567940067
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: c9:b4:c8:77:0a:b0:73:ee:36:3e:00:93:91:3f:fb:77:23:6f:ce:da
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 14:40:c3:12:bb:bd:49:55:ba:23:c5:b8:d5:26:0a:56:b0:cc:ca:cf
Fingerprint (sha256): d7:bd:1c:5c:99:b2:5f:98:9c:c7:b7:56:b8:8d:96:79:87:28:ff:8f:4e:fe:32:83:b8:8e:7c:04:04:9d:05:42

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 catalog.fi

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for catalog.fi

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

catalog.fi
www.catalog.fi

Other certificates including the domain name catalog.fi

(limited to 100 certificates)

Certificate

The complete raw certificate details for catalog.fi 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 316004399103663493247744075647910567940067
 . . . . . . . . [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 2020-02-06 22:23:56 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-05-06 22:23:56 +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 'catalog.fi'
 . . . . . . . . [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 773571232180558972739307946307204713234747261215614890204824046784911297598469301790540954161533333293222466976832957724696987499933588013494052513973558882069649608575746363659705484840632397189603535000484593092647333849935872718155639771556828830061242948478794309634100070550470606157873367545396929848245910542195428559326914244321249989771737028424032576278506292866445288973182139956583569345865381195075753641301981089188028741284815389959475028456073536715174593948169185364078311464052285497586281700393608970855320829603525828808229807191372142382496907584503603442467784519268286003800419362366604529822610140894905663999129568758665920510296571498177895085472547822553987789729187624304739261043789692929500660226312036827185898372111240163552862305898020303919012494239074999592095909898899348126788543754793920290501982714160644741963140757434323978590981720066495539204760756411699788691834085713965589532110716680689854984252631534570120847206291778404450944875747092053474926626663630629592960397120572025640635182290784791042124729236271747459435790548163019266916960292532994424094436157684982370465914370644899076074616908045493206827282357906987943096844170143491922526761973362582992189693589349673130061141927
 . . . . . . . . . . . . . . . . . . . . [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)
							c9b4c8770ab073ee363e0093913ffb77236fceda
 . . . . . . . . . . . . . . . . [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 (30 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'catalog.fi'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.catalog.fi'
 . . . . . . . . . . . . . . . . [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 (246 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes)
							00f1007600f095a459f200d18240102d2f93888ead4bfe1d47e399e1d034a6b0a8aa8eb273000001701cd130510000040300473045022100eefe562c64b8d27162c3e51b3da466013f9ea4f297c5f2cf059dd8bbba96078f02206e2fadca538414236b73ec3b71206f6c9462d029c0d19469896e8607166b239700770007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c000001701cd13078000004030048304602210090c2bebcca4a8bde61fa4f2f6f907efcf71178795aad3a50f48b07436efeb8dc022100869b7c23c6384f5c19556c7bcd79b7494d684ef3a68386151f2acd40e435bf43
 . . . . [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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