DV SSL/TLS Certificate for s.yfu.me

Certificate is witin its validity period

Issued by Let's Encrypt (R11)

About the s.yfu.me DV SSL/TLS Certificate

This certificate with serial number 05:6c:60:2b:d5:11:7b:c7:37:47:e5:97:fa:cc:f4:2e:0b:8c for s.yfu.me was issued on by Let's Encrypt.

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 s.yfu.me 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): 05:6c:60:2b:d5:11:7b:c7:37:47:e5:97:fa:cc:f4:2e:0b:8c
Serial Number (int): 472439758764161288042601589553515243375500
Serial Number Length: 139 bits, 18 octets

Subject Key Identifier: 21:bc:71:1d:d9:15:0a:09:c0:28:ae:22:b3:28:c3:58:af:10:fa:e3
Authority Key Identifier: c5:cf:46:a4:ea:f4:c3:c0:7a:6c:95:c4:2d:b0:5e:92:2f:26:e3:b9

Fingerprint (SHA-1): dc:fc:ac:50:86:a3:9b:de:bc:a0:34:ed:de:9a:e5:6c:38:e3:87:0e
Fingerprint (SHA-256): 78:10:56:63:69:10:58:be:03:04:93:af:fa:33:a1:83:f4:89:57:40:f1:1c:d6:69:39:2c:19:d2:32:1a:88:24

Issuing Certificate URL: http://r11.i.lencr.org/

Revocation Information

CRL Distribution Point: http://r11.c.lencr.org/13.crl

Check the revocation status for certificate s.yfu.me
1
DNS Names
0
Email Addresses
0
IP Addresses

Advanced Certificate Properties

Technical details of the X.509 certificate for s.yfu.me

Public Key Algorithm
RSA
Key Size
2048
Signature Algorithm
SHA256 with RSA
Key Usage
Key Encipherment
Digital Signature
Extended Key Usages
Server Authentication
Client Authentication
Extensions
10
CA Certificate
This is not a CA certificate

Subject Alternative Names

s.yfu.me

X.509 Certificate

The complete raw X.509 certificate details for s.yfu.me in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAo5zOgkZraOLzvNmsL2kG
msCM5/UGaLz057/i2q2wTO4faAVk6nGanA+N/G3+YzVrPHyiH7cXLkwxA5ET0C0o
WUb51enERrWo126L0PTN88Qw3e42hQTPIOQPgZ4c73sGvjxJGYBv1RByVrrwWBCz
R5xzn25RUIBZOLcfqK/TqhfdWUM2uG3WoKRAkRZTf9T/+wKKodT8PIcLF2In8024
PNNqw3zQeyom+OUn4AWqUXCKwcmcCp8FqoYyOQwNTJJpcqJ8vleRXgPOjDwbmc9i
f3SDtbRNzco0xcyWTC60OE8cgpJbrQXuwRRRYzilxBYB3+GjqMcpPN+RnOzpj1Hp
pwIDAQAB
-----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 472439758764161288042601589553515243375500
 . . . . . . . . [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 'R11'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2025-05-11 08:17:32 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2025-08-09 08:17:31 +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 's.yfu.me'
 . . . . . . . . [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 20654167962992061273648909007195411706945390137160371861417240215443063828284127441884096441201024425218013588733298985078529354123168065271752860640660846410930886432729772837662792444373029895066520426827390130557511098105761406381284451834643577423636285337259802902807967965725281032269136473673544177423487728942558316637999912702104561359385403761582611524749112613034667961101221301880663331462479501659717344160434368626121640442122975320988549894381170579631584456439741771822175231062376163915898132812382000420863152139620466575239319276854101996313561286047082965121328091405818589261680270797047921240487
 . . . . . . . . . . . . . . . . . . . . [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)
							21bc711dd9150a09c028ae22b328c358af10fae3
 . . . . . . . . . . . . . . . . [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 c5cf46a4eaf4c3c07a6c95c42db05e922f26e3b9
 . . . . . . . . . . . . . . . . [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://r11.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 (12 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 's.yfu.me'
 . . . . . . . . . . . . . . . . [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://r11.c.lencr.org/13.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)
							00f0007500ed3c4bd6e806c2a4a20057dbcb24e23801df512fedc486c5700f20ddb73e3fe000000196bea144a6000004030046304402201a8f338d42555d0429035879583e44c691b667fc85a12ae17a967dd1f23e8b23022068f39cd7e65ed3c0468859ca78b37b20c4daa95b77e3e47f8bb8f8cde0430bdb0077001a04ff49d0541d40aff6a0c3bff1d8c4672f4eecee234068986b17402edc897d00000196bea14d080000040300483046022100b8808eb9b929e809aece87607cf215b0a28b9f3c8a4c214d9f9c8868b901f728022100c7602bd1f5266c1fa854e48a9666d4a47eda25c8f4928047bf420a038bce79f9
 . . . . [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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