DV SSL/TLS Certificate for www.puppy-tsukuba.jp

Certificate is witin its validity period

Issued by Let's Encrypt (R10)

About the www.puppy-tsukuba.jp DV SSL/TLS Certificate

This certificate with serial number 06:e2:4f:12:45:32:6e:bb:f3:18:bc:b9:cc:73:ed:58:52:c5 for www.puppy-tsukuba.jp was issued on by Let's Encrypt.

With 2 subject alternative names, this certificate can be used to secure multiple FQDNs. This DV SSL/TLS Certificate is currently within its validity period but we haven't checked the revocation status of this certificate, you can do this simply on revocationcheck.com. We have found some issues with the compliance of this certificate, they are be shown below. We hope this DV SSL/TLS Certificate review for www.puppy-tsukuba.jp provides you with the detailed information you were looking for.


We have identified some issues with this certificate:
  • 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)

Let's Encrypt

Organization: Let's Encrypt
Country: US

This X.509 certificate will expire on

Certificate Details

Serial Number (hex): 06:e2:4f:12:45:32:6e:bb:f3:18:bc:b9:cc:73:ed:58:52:c5
Serial Number (int): 599682634391185975949201240947165507375813
Serial Number Length: 139 bits, 18 octets

Subject Key Identifier: 15:9f:14:95:2a:fd:07:54:98:fc:14:af:7a:14:27:84:c5:88:1d:b1
Authority Key Identifier: bb:bc:c3:47:a5:e4:bc:a9:c6:c3:a4:72:0c:10:8d:a2:35:e1:c8:e8

Fingerprint (SHA-1): bb:a1:4f:30:87:ae:7d:00:2e:fb:ab:ed:50:ca:9e:e9:b5:a2:dc:91
Fingerprint (SHA-256): 1a:07:0c:93:e3:c0:bb:6e:b5:82:71:e1:23:8e:3b:db:6d:c0:a2:51:42:98:82:1c:99:50:3d:c4:c6:5e:4f:d5

Issuing Certificate URL: http://r10.i.lencr.org/

Revocation Information

CRL Distribution Point: http://r10.c.lencr.org/70.crl

Check the revocation status for certificate www.puppy-tsukuba.jp
2
DNS Names
0
Email Addresses
0
IP Addresses

Advanced Certificate Properties

Technical details of the X.509 certificate for www.puppy-tsukuba.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
10
CA Certificate
This is not a CA certificate

Subject Alternative Names

X.509 Certificate

The complete raw X.509 certificate details for www.puppy-tsukuba.jp in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA0PJyPWQCr7Dt9V7xStjr
2ztjoMNp7EEZo9kzq+TaIbR+ZoHysHtHCdxm9gQwdlAUTBTOGmQO6fReup8NgFkX
+OkpC/DmPLYTq1xteHUxSHLR6UJzPyewNlZFOBrLImLfOopIXw7mHQA1QMijbPtv
BT9Vj21DcR6BFvmtGZbgZPgj4YZQWKjvcdWjyFBXpqbbWwuuxgKiMTRE3dxtI3La
oLsEqJg0COGDLiQQC6sqm1jkItjG+wjvTwFUedROLtvhCt42fY/ShHsl04IrSYfh
XVk4xInDbwWI7yEEBwsub/Sg8ocfeZOl9y9FAFXP51wCmH+oXcwcOr0C7bCGwyyU
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 599682634391185975949201240947165507375813
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11
 . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'R10'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2025-05-22 22:23:25 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2025-08-20 22:23:24 +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
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'www.puppy-tsukuba.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
 . . . . . . . . . . . . . . . . [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 26377122134308740170567058311402419400324116674556565087827790950556899134021040656152316981587298723790255303122471042525565471198247467878498580263007156289672105386512475125434482180085339966173130537493156747568907868038686576361180789672805357435300738715733746773114270493353007122440105407418983863368685035941289366081169174139024555141493655666894381070538781955691094823680475600062433710357014989975978824593648399543193829811121267197817453370735095604380085240137842123611521090860129813616346954902380317985255127465866417067013188893798228468943434980466943864422890866624761961504867850050038187988099
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.2
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.19
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (20 bytes)
							159f14952afd075498fc14af7a142784c5881db1
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.35
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName bbbcc347a5e4bca9c6c3a4720c108da235e1c8e8
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.1.1
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (39 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.2
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://r10.i.lencr.org/'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.17
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (42 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'puppy-tsukuba.jp'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.puppy-tsukuba.jp'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.32
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.31
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (39 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://r10.c.lencr.org/70.crl'
 . . . . . . . . . . . . . . . . [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)
							00f000770012f14e34bd53724c840619c38f3f7a13f8e7b56287889c6d300584ebe586263a00000196fa4daa9c0000040300483046022100cf561bb48dd235480e34605c981779c5b804d05060c584cb91177fbf8f5a7d6d022100c8c87720921e1b0dceaf5e4b16456e8bf814375960149f4590b36b871a2544a9007500ccfb0f6a85710965fe959b53cee9b27c22e9855c0d978db6a97e54c0fe4c0db000000196fa4dba4d0000040300463044022037f613f6c7571f957ebb72a2733518b5b36147d492e4e31351abb16f7ed897670220483b5d74526a52fe002122e4368cffd64596831d1fb8843d96805893ab17919e
 . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11
 . . . . . . . . [c:0|t:5|false] NULL []
 . . . . [c:0|t:3|false] BIT STRING (2048 bits)
		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