www.chiba-kosodate.jp

Issued by R3

About this certificate

This digital certificate with serial number 03:75:7f:90:4b:e4:f0:6e:e2:d7:1d:e2:b4:2f:6d:3e:db:17 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=www.chiba-kosodate.jp

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:75:7f:90:4b:e4:f0:6e:e2:d7:1d:e2:b4:2f:6d:3e:db:17
Serial Number (int): 301319455910562005278671679244391908563735
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 3b:10:5f:53:23:5c:4b:52:54:90:1f:bf:2f:f3:f0:e7:65:33:ab:65
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): ec:61:78:11:02:bb:ca:59:7f:30:67:11:0d:7c:0c:c0:df:b4:88:ec
Fingerprint (sha256): c5:3f:e5:04:10:bb:c3:d1:67:b9:bb:f5:7f:ca:07:8a:29:e4:d5:51:b0:a2:85:28:91:06:2c:75:0e:85:77:99

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

Revocation information

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

Check the revocation status for certificate www.chiba-kosodate.jp

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.chiba-kosodate.jp

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

chiba-kosodate.jp
www.chiba-kosodate.jp

Other certificates including the domain name chiba-kosodate.jp

(limited to 100 certificates)
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp

Certificate

The complete raw certificate details for www.chiba-kosodate.jp in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----
MIIFCjCCA/KgAwIBAgISA3V/kEvk8G7i1x3itC9tPtsXMA0GCSqGSIb3DQEBCwUA
MDIxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQswCQYDVQQD
EwJSMzAeFw0yMzEyMDIwMzE0MTBaFw0yNDAzMDEwMzE0MDlaMCAxHjAcBgNVBAMT
FXd3dy5jaGliYS1rb3NvZGF0ZS5qcDCCASIwDQYJKoZIhvcNAQEBBQADggEPADCC
AQoCggEBAL/lASX3mnKQnFAYYx6twqP0spY8vVEopdyFS/Nx6H8LCdNV4p35HtV1
KCJ3RmxlKEofoRzN/RH6Uo7ggF8j5TENAfPWpQk4PTLMjr23Qijx4eGiT4x2NH+s
VSpIsnN/Q6d+HOVfRoGrA3W/gXQiDaPi1GqpcZcUZadJdw/lt01tGG7dbhbnA9L3
/7AjQtQBB+31h5x9VawGmuVxRpgZFDgjvhZbct5zMjOVrtgd4kJvcFPr4S8xgr89
dRkfWwsYEvsGoGbqNYZjuUI1Rs7QFDdB+q9iBLCzEv9WuwDC0Xk0pD7M0abM/k+y
4FSETjalfHXBJVB9RPgnOQZS+/P7hhsCAwEAAaOCAiowggImMA4GA1UdDwEB/wQE
AwIFoDAdBgNVHSUEFjAUBggrBgEFBQcDAQYIKwYBBQUHAwIwDAYDVR0TAQH/BAIw
ADAdBgNVHQ4EFgQUOxBfUyNcS1JUkB+/L/Pw52Uzq2UwHwYDVR0jBBgwFoAUFC6z
F7dYVsuuUAlA5h+vnYsUwsYwVQYIKwYBBQUHAQEESTBHMCEGCCsGAQUFBzABhhVo
dHRwOi8vcjMuby5sZW5jci5vcmcwIgYIKwYBBQUHMAKGFmh0dHA6Ly9yMy5pLmxl
bmNyLm9yZy8wMwYDVR0RBCwwKoIRY2hpYmEta29zb2RhdGUuanCCFXd3dy5jaGli
YS1rb3NvZGF0ZS5qcDATBgNVHSAEDDAKMAgGBmeBDAECATCCAQQGCisGAQQB1nkC
BAIEgfUEgfIA8AB2AEiw42vapkc0D+VqAvqdMOscUgHLVt0sgdm7v6s52IRzAAAB
jCi74bQAAAQDAEcwRQIgYtkGpUaqhI8Kn5iIbsZx0vDIT/spMBKDqiTClZeW0k8C
IQDl4fQsn0D8GZwqs2uLc57/tbMvgyvKj0YFmNQlxkZrhAB2AO7N0GTV2xrOxVy3
nbTNE6Iyh0Z8vOzew1FIWUZxH7WbAAABjCi74moAAAQDAEcwRQIgSV4IvM56dihU
mOHejgru3OXEXE9f87HjrhwtOwewr0MCIQCyMUFnwVVg/fbALM0Ukh0LNNTLIbDU
B5HIgHBwiB1MhjANBgkqhkiG9w0BAQsFAAOCAQEAle/2M6S6FkvPQlONKmPT7aoC
uwHp2m19hCl0NZ2MQ3bED5c75VzpqtB0t0UqAi97b1SLzJNN+7PDvSUZ99bxxTW4
0a4h1Z/noW9TYhKgms+7+Fj54HkvAI3emKmzj4v/Ip4jKnDKvfEA6g62Cs2Pb9Vh
ZpAvSc8ON+Pm7JZphG2YgQAaDqu1GOH5Tnzg86yM9CKvGNfsKR9Co8e8RaF4fwzX
vG+lkvlNKgqASnwN6yzQc4zJrLWp8kLthXMV2fp5Ilp71tkC3OXUCVdEiJZxNNML
TkxT/hIY0Xx2mi5PDSXRc6P4SUNnE9JwC3s5o6Itv0AtwIWdJE3p9mKUqVhrIg==
-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAv+UBJfeacpCcUBhjHq3C
o/Syljy9USil3IVL83HofwsJ01Xinfke1XUoIndGbGUoSh+hHM39EfpSjuCAXyPl
MQ0B89alCTg9MsyOvbdCKPHh4aJPjHY0f6xVKkiyc39Dp34c5V9GgasDdb+BdCIN
o+LUaqlxlxRlp0l3D+W3TW0Ybt1uFucD0vf/sCNC1AEH7fWHnH1VrAaa5XFGmBkU
OCO+Flty3nMyM5Wu2B3iQm9wU+vhLzGCvz11GR9bCxgS+wagZuo1hmO5QjVGztAU
N0H6r2IEsLMS/1a7AMLReTSkPszRpsz+T7LgVIRONqV8dcElUH1E+Cc5BlL78/uG
GwIDAQAB
-----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 301319455910562005278671679244391908563735
 . . . . . . . . [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 2023-12-02 03:14:10 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-03-01 03:14:09 +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 'www.chiba-kosodate.jp'
 . . . . . . . . [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 24224442569180031179284574139249943469514086076720353494208472575827969430074581853524593568985576226971521593994840195767596498803105493924908073961060102530565393002676369739299810420701763669316023701429636402446142701515212011830406128221280220148608749052383444815780978999897462430133573505366628288994801005427936913608305736204483200572019066542435595675535398689842721558254125137461725213919853194872214804185837799789570969406166810271593292219393516627117064810885798208418865631664353833959718087978551301421526391654532183776972081533205822031550378200902486095126835288533910398430884487398290743854619
 . . . . . . . . . . . . . . . . . . . . [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)
							3b105f53235c4b5254901fbf2ff3f0e76533ab65
 . . . . . . . . . . . . . . . . [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 (44 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'chiba-kosodate.jp'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.chiba-kosodate.jp'
 . . . . . . . . . . . . . . . . [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 (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f000760048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018c28bbe1b40000040300473045022062d906a546aa848f0a9f98886ec671d2f0c84ffb29301283aa24c2959796d24f022100e5e1f42c9f40fc199c2ab36b8b739effb5b32f832bca8f460598d425c6466b84007600eecdd064d5db1acec55cb79db4cd13a23287467cbcecdec351485946711fb59b0000018c28bbe26a00000403004730450220495e08bcce7a76285498e1de8e0aeedce5c45c4f5ff3b1e3ae1c2d3b07b0af43022100b2314167c15560fdf6c02ccd14921d0b34d4cb21b0d40791c8807070881d4c86
 . . . . [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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