mail.ihoc.edu.vn

Issued by R3

About this certificate

This digital certificate with serial number 04:f1:54:61:72:b7:dd:8a:35:ab:a0:71:ba:69:a9:24:42:b3 was issued on by Let's Encrypt.

With 3 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=mail.ihoc.edu.vn

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:f1:54:61:72:b7:dd:8a:35:ab:a0:71:ba:69:a9:24:42:b3
Serial Number (int): 430569355286190378921558569896390684852915
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 85:c3:10:0f:59:4e:69:62:4d:4e:5b:6a:10:56:64:f8:cd:78:de:71
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): a1:c4:33:48:05:20:63:9f:5a:3a:86:7d:46:2b:10:c8:56:c5:f8:95
Fingerprint (sha256): 27:1a:c5:48:f3:1e:fe:e2:e0:79:df:a7:98:bf:43:bf:97:04:79:5a:08:69:92:dd:0e:98:10:30:f3:6b:be:08

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

Revocation information

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

Check the revocation status for certificate mail.ihoc.edu.vn

3

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for mail.ihoc.edu.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

9 extensions
No unhandled critical extensions

CA Certificate

This is not a CA certificate

Subject Alternative Names

ihoc.edu.vn
mail.ihoc.edu.vn
www.ihoc.edu.vn

Other certificates including the domain name ihoc.edu.vn

(limited to 100 certificates)
sni22311.cloudflaressl.com
mail.ihoc.edu.vn
sni22311.cloudflaressl.com
www.thietkequangcao.edu.vn
www.ihoc.edu.vn
vienquantri.ihoc.edu.vn
vienquantri.ihoc.edu.vn
khoahochay.edu.vn
www.sachso.edu.vn
meohay.ihoc.edu.vn
vienquantri.ihoc.edu.vn
fibo.edu.vn

Certificate

The complete raw certificate details for mail.ihoc.edu.vn in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyTNQ0Hvc1ObQEYoWOl/z
GF0IRHMmAFkII2q4oCfrOvvO/z6nCZW4XveHa2vAq+UAeV9y6QK9NzMnFqpOCgZX
BPdBCRucW4lFi8dCRnPZJ/sq3CJu0PJkaFObVFvHwybeMjmQHEwP0z4DMtHnBqe6
wksl51/duDqoPd4rjbCKeGVUzpAD8y4Y2A3IEwmbdkKuK+740vOCCav/6pvB1iM5
mS8RnvcLjj841czYn4NvUFooVv/zIEcOsFNymJPKTpjzxuHqclFBeMeAbTUnPnai
9c1GjAjmIU+AUkoMRdvS6EGKCrVLsXbtMYo682umu/SkMT3KcD0eNq6kYV4Ypil9
KwIDAQAB
-----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 430569355286190378921558569896390684852915
 . . . . . . . . [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 13:05:26 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-03-01 13:05:25 +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 'mail.ihoc.edu.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 (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 25399204003702174636663450334942878166880577441547995839063693740080304954906122969760643228125642530917682601759355207911400399717246733560755054286351997999323434451334689507827923046704670460657884207365871448599782529139630213052067506064085385515646252420880869093884479167299205867781422468548029335842081610089950328310155436661080737822251255755801906750371073029591463746727644585788983130525318130042501758478033594971385605153081244938871920653216931473293304267716556671145433277199277856059338925612652696578084067482252708067739632007994914044070173994640722794826763958001824895821960389146830829092139
 . . . . . . . . . . . . . . . . . . . . [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)
							85c3100f594e69624d4e5b6a105664f8cd78de71
 . . . . . . . . . . . . . . . . [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 (50 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'ihoc.edu.vn'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.ihoc.edu.vn'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.ihoc.edu.vn'
 . . . . . . . . . . . . . . . . [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)
							00f000760048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018c2ad9327e000004030047304502200c126b8e9bb08368c67fab88e7123e6624796c9161f490f01b14cf8047cfc7f9022100dd0c5b4290a1484a5742f6af5d4ccc318d2d2f1e3e47a14bf05ae78e61ece90e00760029d03a1bb674aa711cd3035b6557c14f8aa78b4fe8389449eca453f944bd24680000018c2ad9333d0000040300473045022100ece7c21bdbdf881d8d38c7097fcb3840633ac8c8407a8decf317004b29eacbc30220785cc1e86f28fa79824ab464e672c8351cb2b90238133495fb5cd5d3a711c62e
 . . . . [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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