a42.io

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:1e:a7:4c:03:98:0e:d4:0a:9a:6d:88:29:c4:ad:94:c5:f2 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): 03:1e:a7:4c:03:98:0e:d4:0a:9a:6d:88:29:c4:ad:94:c5:f2
Serial Number (int): 271767704565660722087054444566065882383858
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 67:59:2d:c2:10:92:2b:1e:11:d3:2d:33:cd:c1:38:99:f5:62:a3:91
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 9d:83:55:ce:7b:b8:f4:8e:d2:22:a3:6c:1e:68:6d:3a:d5:2a:dd:87
Fingerprint (sha256): fe:05:4b:67:1f:04:48:d2:f3:0f:df:1f:2d:33:a3:da:e5:c5:23:40:00:5b:8b:99:61:09:fe:6b:59:b6:01:f3

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-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA1C9msPCWqTsO4xTiYUXh
C2N8JwBXVnCzEjicbDPrrFXBRG8rhFk6MyKH0nc9d1RQhkXjBBuwQx7+q8CCt9iu
bUa6Ue/yyZR57xrW7XahByFtY+6F3nflqrus2LTkD0RY15kPkG73pHDmuUoBSeGL
kwLO9pVqGV6fF0hc+MceB+c1MA3fXmHFVZhoKd2RqRvHAbJpTwIdQxclM2fMpUMR
y8SrBzxr7yYLQYTY9xPeA9X9QQHP0Qc/FIIK10R3jLNN9J4LMrK1QenJNZD6euhV
XACrz36pZFE6mXkQo8GXGDTC5hB+6dXhlHYmSWhsPfYLrMeeq45JAVsHmCJ7NPzc
wwIDAQAB
-----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 271767704565660722087054444566065882383858
 . . . . . . . . [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 2019-08-28 10:52:40 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-11-26 10:52:40 +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 26785895024824766849740419282072126332466830249315512784575163401597732023290118084666718856084474945296628933839961447529008990222565139775679885899568078347715789382356099218168928532851744946130961880692857672572867615479549072083874197109425777680246081472661474260697640993804027869656213921380214639912403788994531311568015016845440960346233903904860807624020471930103068627565239130905961632451404767638574038699127622144948484764268431759477411551082207822769946229736240322887534689317191090063599991953492822186528855938922814794347029073537650647782385965691107704590493098782001290073068938789095978360003
 . . . . . . . . . . . . . . . . . . . . [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)
							67592dc210922b1e11d32d33cdc13899f562a391
 . . . . . . . . . . . . . . . . [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 (244 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes)
							00ef00750063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d0000016cd8121948000004030046304402203837caba42b3f9d03b9fca9e0959d8339bcbf9eb3a781839a9f5c9d8b94bdc5a02205969c644788285bf634e8def6d610a6cc52517128333dc9cdeef72e01dea39f00076006f5376ac31f03119d89900a45115ff77151c11d902c10029068db2089a37d9130000016cd8121c2e000004030047304502210089b387d59dac351454ee8878911c8a80f31391b53c803896506d45c46eb8b16d02201270a5b0df354ce70b45b947340f8422534d1cfbe58c30eb36098cd272b71db0
 . . . . [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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