DV SSL/TLS Certificate for learnvietnamese.com.vn

Certificate is witin its validity period

Issued by Let's Encrypt (R11)

About the learnvietnamese.com.vn DV SSL/TLS Certificate

This certificate with serial number 05:4b:e5:38:66:89:72:44:79:a3:c1:77:aa:a9:55:4d:da:e0 for learnvietnamese.com.vn 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 learnvietnamese.com.vn 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): 05:4b:e5:38:66:89:72:44:79:a3:c1:77:aa:a9:55:4d:da:e0
Serial Number (int): 461387293237225843587541831730255752977120
Serial Number Length: 139 bits, 18 octets

Subject Key Identifier: 2e:67:c4:79:66:ad:b8:c0:43:04:bb:43:89:c2:db:1c:27:ac:67:03
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): c2:a5:2f:72:23:95:34:ef:08:d8:89:d0:c4:c1:3f:05:7a:8e:da:46
Fingerprint (SHA-256): e7:ba:fa:a8:e0:66:8f:47:8b:44:53:b8:4d:a9:5c:00:25:7c:3e:33:9c:c7:2d:de:77:8e:0c:c2:2b:4a:70:19

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

Revocation Information

CRL Distribution Point: http://r11.c.lencr.org/97.crl

Check the revocation status for certificate learnvietnamese.com.vn
2
DNS Names
0
Email Addresses
0
IP Addresses

Advanced Certificate Properties

Technical details of the X.509 certificate for learnvietnamese.com.vn

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 learnvietnamese.com.vn in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAz9JJ70kfWPEPdXgmVgFu
btayGodufMljpAIklQJNvkm7SPpt/eOEG7/5cpi6QiXYzidm7jlHhu654YWoB6kS
cM/wW7y8ss6ZZdPpJaQSwKgloEAI/D8ivFEHInUjicOFbeN/yHXPvRo2ZhW8WXOt
DS4s2grjIDydiu4p5J6ZHb/ZW3MmN3tCViEl7Wi9wjEjQ+hplns3fiiWa0WT6CzV
qYm1KEuMGjijcOjTAsEnSgw3BY4UQdNeGR+yAG9lrmNXrI4zf5cwT9RpMeEby5vz
OyA+CL7si0dI/qhyscKk77LDoMKpTJH3ohKHyLQmS+iW/hwwuhfmoRXohkTvIyq3
FwIDAQAB
-----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 461387293237225843587541831730255752977120
 . . . . . . . . [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 2025-06-05 23:31:03 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2025-09-03 23:31:02 +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 'learnvietnamese.com.vn'
 . . . . . . . . [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 26235026403782576256565901293653435357042625095150807133265373255375659561545306240685809440996694864695768722433189210236085080957016924755003080540653399042100114073433588230175004112145734959834142938603252207032748653410987611078882598981380607895104534263907499128432754752158848131686289928935150473543603830405595492100515561627297096901828876664771358211563754248171198700727330812641839434173135784640118158354036513806485248591250020852870660533503320027082668785618304736562812762435470715181477466162622639087598072495812704545143358332978444251156794229826312183151910772306090548793909990550542796633879
 . . . . . . . . . . . . . . . . . . . . [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)
							2e67c47966adb8c04304bb4389c2db1c27ac6703
 . . . . . . . . . . . . . . . . [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 (54 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'learnvietnamese.com.vn'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.learnvietnamese.com.vn'
 . . . . . . . . . . . . . . . . [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/97.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 (244 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes)
							00ef0075000de1f2302bd30dc140621209ea552efc47747cb1d7e930ef0e421eb47e4eaa340000019742a49d6b0000040300463044022059326365131573abf9c83f22c42e0aad8b55a0a8bd6bcea2147bb54cfa0297c3022042a240c0c54e4922e98ebc32b17a8653aa50ee74bd075c13952b657bde1c038f007600ccfb0f6a85710965fe959b53cee9b27c22e9855c0d978db6a97e54c0fe4c0db00000019742a4ad0b000004030047304502205832a6f1aa9b252e15edba5455fe05c0205c3e0603fb62531342d263ffff10e8022100971075e18e0434bc8bd4effe7cb93bcc29745b9252489f437dbbcf8fbc4a90b3
 . . . . [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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