zonetel.com.sg

Issued by R3

About this certificate

This digital certificate with serial number 04:45:03:32:7a:a4:0a:cb:87:91:90:a0:e6:38:a9:a3:7a:77 was issued on by Let's Encrypt.

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=zonetel.com.sg

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:45:03:32:7a:a4:0a:cb:87:91:90:a0:e6:38:a9:a3:7a:77
Serial Number (int): 371932876830866753254555996836994297854583
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: f0:9c:33:0d:52:b8:e2:f0:e7:c4:a9:b7:cd:e5:5d:0f:db:56:5a:fe
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): d2:91:92:5d:6d:5d:09:7e:9e:2f:64:89:c8:df:ba:7a:c9:01:6f:5b
Fingerprint (sha256): 98:a0:8d:fc:81:b1:f6:dc:70:81:a9:36:08:36:b0:85:61:8a:51:ca:e9:f5:47:e8:ce:1b:37:bc:f3:61:06:d9

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

Revocation information

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

Check the revocation status for certificate zonetel.com.sg

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for zonetel.com.sg

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

zonetel.com.sg

Other certificates including the domain name zonetel.com.sg

(limited to 100 certificates)
zone-aws.zonetel.com.sg
zone-aws.zonetel.com.sg
zonetel.com.sg
ipzentrex.zonetel.com.sg
zonetel.com.sg
*.zonetel.com.sg
zone-aws.zonetel.com.sg
gelcccs.zonetel.com.sg
zonetel.com.sg
*.zonetel.com.sg
*.zonetel.com.sg
app.zonetel.com.sg
www.zonetel.com.sg
zone-aws.zonetel.com.sg
zone-aws.zonetel.com.sg
bizsolution.zonetel.com.sg
zone-aws.zonetel.com.sg
ipzentrex.zonetel.com.sg
zone-aws.zonetel.com.sg
*.zonetel.com.sg
zone-aws.zonetel.com.sg
www.zonetel.com.sg
www.zonetel.com.sg
zonetel.com.sg
bizsolution.zonetel.com.sg
www.zonetel.com.sg
gelcccs.zonetel.com.sg
bizsolution.zonetel.com.sg
zone-aws.zonetel.com.sg
zonetel.com.sg
*.zonetel.com.sg
app.zonetel.com.sg
zone-aws.zonetel.com.sg
mss.zonetel.com.sg
zonetel.com.sg
mss.zonetel.com.sg
zonetel.com.sg
zonetel.com.sg
zonetel.com.sg
geli.zonetel.com.sg
app.zonetel.com.sg
zonetel.com.sg
zone-aws.zonetel.com.sg
www.zonetel.com.sg
zonetel.com.sg
zonetel.com.sg
*.zonetel.com.sg
zonetel.com.sg
zonetel.com.sg
app.zonetel.com.sg
www.zonetel.com.sg
zone-aws.zonetel.com.sg
*.zonetel.com.sg
app.zonetel.com.sg
zone-aws.zonetel.com.sg
www.zonetel.com.sg
zonetel.com.sg
zone-aws.zonetel.com.sg
zonetel.com.sg
bizsolution.zonetel.com.sg
gelcccs.zonetel.com.sg
app.zonetel.com.sg
zone-aws.zonetel.com.sg
zonetel.com.sg
www.zonetel.com.sg
zone-aws.zonetel.com.sg

Certificate

The complete raw certificate details for zonetel.com.sg in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAlg6D6a4bjJjKcuDcNZHH
8oDNa0/TsapAcr0v4tABB/2X6hlDdLVQoSJ144kzzF9IJqChpAbT6QKX6MUW2VIH
mABi9lU0Lyfb6i49qL9/BmgxkYiU2r7zYDuSDtrkSAJaw/RYEkDz6xo2e1h+wrPQ
P9hY6GI3YHN5S5FRJg5EmpPf24bz4CRYt4iyp+7QAd/gTqZWS1feqlHVCV3EDymp
MqZ8W4DwgEGeQ/ISf6kCgXT+XvRHP4O0kXNhNfJH90zhsf/Ma9v3sXX8D1vOuy+/
6QtqnGZv4YKU8ZAQnNS29vVx/o/qwQOyFpvRDbCcHVJWVlIdOV4RTETwc3mrNzrh
cwIDAQAB
-----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 371932876830866753254555996836994297854583
 . . . . . . . . [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 2023-12-10 07:05:33 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-03-09 07:05:32 +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 'zonetel.com.sg'
 . . . . . . . . [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 18942903498432121756298141664524412781946319897303899350960397528875919725015887031029299628534607274715508955970565319713272635984927027825001634642003390580897748175670858793369669442358552358102751757768294548682741390448203414804391559699883698140289546550111562218891050697973975848751285988594666010937093610140967810700666926376514015540868195311223786919890965193440556161992112962447131832476805348160270739944227527210550455323855415435402135833446570819616492587240865991899098592381725794889090483179731231621323396248446496018702149484038292713065499822220519656093546322524227832299771101260086406472051
 . . . . . . . . . . . . . . . . . . . . [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)
							f09c330d52b8e2f0e7c4a9b7cde55d0fdb565afe
 . . . . . . . . . . . . . . . . [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 (18 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'zonetel.com.sg'
 . . . . . . . . . . . . . . . . [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)
							00f000760048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018c52c298850000040300473045022007a1d4a88aa9e0dc6fff25318f5a15afc5cbc9a3ac6291b066c1a66f9fe48528022100f8ec12ec9e6097761e9cc4456582d0953f6556b64fdaf7371b6f74e4288be920007600a2e2bfd61ede2f2f07a0d64e6d37a7dc6543b0c6b52ea2dab78af89a6df517d80000018c52c2988f0000040300473045022100e66959bd01c87279eb6ee87ad3cf50c0fc28009ec38c03737d36b0ade2f480a20220728a27c8667f6be4bab1dc1f7743b62cf04ece3a9141a112ff31697d47862d59
 . . . . [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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