www.babypark.com.hk

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:60:b3:d2:cf:56:d2:be:ff:b8:57:ba:64:ff:54:cc:06:de 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:
  • Subscriber Certificate: commonName is deprecated. (BRs: 7.1.4.2.2)

Certificate Subject

CN=www.babypark.com.hk

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:60:b3:d2:cf:56:d2:be:ff:b8:57:ba:64:ff:54:cc:06:de
Serial Number (int): 294242991418614257375102129240565103724254
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: a1:7f:68:cf:22:10:a4:01:b0:39:9a:96:92:04:f3:8c:79:8d:91:01
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): cc:30:ca:a8:36:9a:41:6f:e5:8a:0f:e9:93:80:be:f7:38:33:10:cb
Fingerprint (sha256): e8:02:5e:0b:61:f6:ca:0c:2b:99:84:e0:a6:e2:86:9b:ca:04:2d:8a:be:41:a7:be:4d:fc:2d:dd:4e:ee:e1:34

Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/

Revocation information

OCSP Server: http://ocsp.int-x3.letsencrypt.org/

Check the revocation status for certificate www.babypark.com.hk

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.babypark.com.hk

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

8 extensions
No unhandled critical extensions

CA Certificate

This is not a CA certificate

Subject Alternative Names

www.babypark.com.hk

Other certificates including the domain name babypark.com.hk

(limited to 100 certificates)
babypark.com.hk
babypark.com.hk
www.babypark.com.hk
zh-hk.babypark.com.hk
www.babypark.com.hk
zh-hk.babypark.com.hk
www.babypark.com.hk
zh-cn.babypark.com.hk
zh-cn.babypark.com.hk
zh-hk.babypark.com.hk
zh-hk.babypark.com.hk
www.babypark.com.hk
zh.babypark.com.hk
zh.babypark.com.hk
zh-cn.babypark.com.hk
zh.babypark.com.hk
www.babypark.com.hk
zh-cn.babypark.com.hk
zh-cn.babypark.com.hk
zh.babypark.com.hk
www.babypark.com.hk
zh-hk.babypark.com.hk
babypark.com.hk
zh-cn.babypark.com.hk
babypark.com.hk
babypark.com.hk
www.babypark.com.hk
babypark.com.hk
zh.babypark.com.hk
zh.babypark.com.hk
www.babypark.com.hk
babypark.com.hk
zh-hk.babypark.com.hk
www.babypark.com.hk
www.babypark.com.hk
zh-hk.babypark.com.hk
zh-cn.babypark.com.hk
zh-cn.babypark.com.hk
zh-hk.babypark.com.hk
babypark.com.hk
www.babypark.com.hk
zh-hk.babypark.com.hk
www.babypark.com.hk
zh.babypark.com.hk
babypark.com.hk
zh-cn.babypark.com.hk
zh-cn.babypark.com.hk
babypark.com.hk
babypark.com.hk
zh.babypark.com.hk
zh.babypark.com.hk
zh-cn.babypark.com.hk
www.babypark.com.hk
www.babypark.com.hk
zh-hk.babypark.com.hk
babypark.com.hk
zh.babypark.com.hk
www.babypark.com.hk
babypark.com.hk
www.babypark.com.hk
zh-cn.babypark.com.hk
babypark.com.hk
zh.babypark.com.hk
zh.babypark.com.hk
babypark.com.hk
www.babypark.com.hk
babypark.com.hk
zh-cn.babypark.com.hk
zh.babypark.com.hk
zh-hk.babypark.com.hk
www.babypark.com.hk
zh.babypark.com.hk
zh-cn.babypark.com.hk
www.babypark.com.hk
www.babypark.com.hk
zh-cn.babypark.com.hk
babypark.com.hk
www.babypark.com.hk
babypark.com.hk
www.babypark.com.hk
zh.babypark.com.hk
zh-hk.babypark.com.hk
babypark.com.hk
zh-cn.babypark.com.hk
babypark.com.hk
www.babypark.com.hk
babypark.com.hk
babypark.com.hk
babypark.com.hk
babypark.com.hk
www.babypark.com.hk
babypark.com.hk
www.babypark.com.hk
babypark.com.hk
babypark.com.hk
babypark.com.hk
zh-hk.babypark.com.hk
zh-cn.babypark.com.hk
zh-hk.babypark.com.hk
zh.babypark.com.hk

Certificate

The complete raw certificate details for www.babypark.com.hk in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAm9kSW9NigXgBbOH9Ybm9
pde93R0HLj4rDmP4wkMo322X07VXEzk15yoGqrCdGH3pjVVQ2/c3XirdvPbIlfsw
l4n7uck7twvnureysSE8C3zhJPfrvTuPVTguRsgkUDfba29B3KChH1maCc6fcOoR
IdipZYGQ0849qUPGLYKOHEsjABEVihmKQ4i5Lu6jiTQzFSdTKGOgSF9OQtqLs/v9
4sLx2D1yRrWZNIr4+75ei3HytyBbNiHkVAO/NG5nuUAvDGwdIDMRyu5nuu62bvkw
IPFLF89IDdmLfFjjBiQp6e97EHjCIYDYJKYtM/egV8/ypxh9eiBecardqWI9kAAI
QwIDAQAB
-----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 294242991418614257375102129240565103724254
 . . . . . . . . [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 'Let's Encrypt Authority X3'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2016-10-13 03:56:00 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2017-01-11 03:56:00 +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 'www.babypark.com.hk'
 . . . . . . . . [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 19673979321251460647722665041107854140326538664684118633229993556976700484796355303985991188923865314926118907036048775402727113171243855935367894888650096759149603891613457970210206310345805228974485162004754286790968970054982138067369956150965647602428077440633880757004964516896392662395891147074102886787299354925827777524711568288557199525710550698061142351074359821207227907990754536009774279103796505286174848597632884906744478137165294617356504382894646440811118754430348356577455675165915379590293628796021200184057076079836852675103650800738534368270018013449271367989483174963291542968630681643249347594307
 . . . . . . . . . . . . . . . . . . . . [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)
							a17f68cf2210a401b0399a969204f38c798d9101
 . . . . . . . . . . . . . . . . [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 a84a6a63047dddbae6d139b7a64565eff3a8eca1
 . . . . . . . . . . . . . . . . [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 (100 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://ocsp.int-x3.letsencrypt.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://cert.int-x3.letsencrypt.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 (23 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.babypark.com.hk'
 . . . . . . . . . . . . . . . . [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 (246 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 1.3.6.1.4.1.44947.1.1.1
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.2.1 (cps)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:22|false] IA5String 'http://cps.letsencrypt.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.2.2 (unotice)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:12|false] UTF8String 'This Certificate may only be relied upon by Relying Parties and only in accordance with the Certificate Policy found at https://letsencrypt.org/repository/'
 . . . . [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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