a42.io

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:69:2e:0c:76:95:71:8b:72:0b:a2:b3:0b:85:e6:b7:6d:31 was issued on by Let's Encrypt.

With 5 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=a42.io

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:69:2e:0c:76:95:71:8b:72:0b:a2:b3:0b:85:e6:b7:6d:31
Serial Number (int): 297127715522512156982496801490972444159281
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 3b:46:fb:55:d5:a7:e4:4a:c4:a4:fb:26:f3:18:e8:59:45:40:43:0f
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 7f:10:a4:32:b0:78:f9:ae:2a:a7:79:75:1c:b7:03:f4:00:cc:2d:ee
Fingerprint (sha256): 94:89:56:58:61:09:79:9f:93:a2:1f:c1:54:c5:1a:22:aa:9f:e4:11:16:55:31:38:71:b7:66:76:7b:e9:1c:b9

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 a42.io

5

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for a42.io

Public Key Algorithm

RSA

Key Size

2048

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

a42.co.jp
a42.io
cafe.dev
playground.io
reiwa.io

Other certificates including the domain name a42.io

(limited to 100 certificates)
a42.io
a42.io
a42.io
a42.io
a42.io
a42.io
a42.io
a42.io
a42.io
a42.io
a42.io
a42.io
a42.io
a42.io
a42.io
a42.io
a42.io
a42.io
a42.io
a42.io

Certificate

The complete raw certificate details for a42.io in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxmIuL8SRjWLy39KxHuic
nhzFUFSlN1wpXywU4xvV8SIzi8jUSYQSp8IUDXd6VJSLf7GfXewDe8NGAirxV3sM
2Ib2GJRDOV8+GQcCWtnZrW7Vuntv4cC/psPXXg5K8BtFn+bOrQY9bAg8drmsJOEb
ofPicpt8+I0fPLR0GjBiMFuuoJsPISdIMZThywwf+xpZTPVkhBmdnMqHwaTCEE7h
i7Jh4D49lQGxWdMox+R1KmPgT0FxPXx85MJrTZEXKkxueMyWDxIofF4389/ZJUO2
bJ2MkdXKH7ut7hLMsFO7k3q06b+L13iIhGaV1v0BkpiRQI1jYEqph1avjHN9pDly
uQIDAQAB
-----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 297127715522512156982496801490972444159281
 . . . . . . . . [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 2019-05-30 05:36:45 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-08-28 05:36:45 +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 'a42.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 (2160 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 25043598951031982554426088637290862662851625037646277911369312195475956984697193996175064831113349475105198432261599893015598892962045464802909973204201274029453432885384118300178069392498928818370940657676786296431399433374818785447599132157346175422833591220365761582059374488462131338916460249474940437818424411588759476961776616825059537316412936381229315226029077832837269741642830947315527617858778940139824530797564010389612755064153568999850063855194564728722916326343666900377781540412496343418800681410769269385831048249672176534694637325803958234820777831433348330236117942976329628154555886199314117653177
 . . . . . . . . . . . . . . . . . . . . [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)
							3b46fb55d5a7e44ac4a4fb26f318e8594540430f
 . . . . . . . . . . . . . . . . [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 (56 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'a42.co.jp'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'a42.io'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'cafe.dev'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'playground.io'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'reiwa.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 (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 (243 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (240 bytes)
							00ee007500747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc560000016b07748834000004030046304402203ed30eb74c49dd100b219382f7f891d39e032961b0a6d805fbed96ee8517991f0220143c3157bb5866e0f07f7c7eb5e5736dd75f05d0ffe8d32335fdde4d600fd52f00750063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d0000016b0774884d0000040300463044022024dcd4f1c9b477c72c2b1f6363e89ff025b2eac2451a8c2b8e87907429904f81022079f353be395fbe1e08c76a5b127be58a0613b16016293efb1e28176771ef15ce
 . . . . [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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