www.hainanventures.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:8d:f0:62:d4:4a:0d:ee:9d:77:2c:9e:8c:b9:bb:40:68:31 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.hainanventures.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:8d:f0:62:d4:4a:0d:ee:9d:77:2c:9e:8c:b9:bb:40:68:31
Serial Number (int): 309636199400951611284104379982180440369201
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: f7:f0:b8:ec:ff:ed:c2:12:35:a3:eb:49:fd:f2:cc:25:80:ac:2d:34
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): a5:ba:2b:5d:0e:f7:58:2b:22:9f:c5:c1:51:e7:6a:1c:b9:ca:28:43
Fingerprint (sha256): 90:11:b0:97:6d:c2:3a:9f:da:3e:46:8e:e1:29:69:35:d1:4d:9c:ed:4e:fa:da:ad:e9:ca:37:ae:e3:85:cb:22

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.hainanventures.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.hainanventures.com

Public Key Algorithm

RSA

Key Size

4096

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

www.hainanventures.com

Other certificates including the domain name hainanventures.com

(limited to 100 certificates)

Certificate

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

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAu0+GaBxfKiqXTd04w/Kc
Xm+35qTJ9Ng9/lNK9n/sHdeHwJOnmjZG1LD9CfYjPAJjzixWb3DsooD5TAruzgpe
I/SvCkDdj6a1/hOZH7Wtitk4/mEUBqGygo3zc7m71kvI3+XY7oz9hgF18BkqnaGl
5X+tiTnXBdgDTGe/EJatflAnd7MSwoCBADLo53zQ8Q2wzk8d8E8AKiuE57K3VAIz
K8980L3Ed9qpbnqhCi6GFl6PJnw23aXtoUHa9ONnxScPvHU53TTZWeaaaIxzn+lf
l14KKSbNzqaiiWFJnSWIu/XEPAC2OLooTjXYwWNHl5h385OScPvQVOcMMSX8mglI
j6vEFVkJ/NsNVcYb4xZOwvxiZygdvV1GT7Arrwox8vQzT3lcWNUMn4jRawNpX7fZ
vIYOxEc3HOsuVwx4ApePh8z4ZD7iMnzDzmecRcPrWwknOI6korkmOgDiIcK9QiAe
VWVTrcAwd3FgVo4421Jnz3cGBgC0zkJCd5k86mR7HP+HdGzKHy+1xCdwpljmea91
HbTeQThpvuYhS4n/V2WLnFX8elzNCA4w2EHbZmnbSbBoKlLJOXETMWkjvyf0uuK/
Wwo79O6p9nUh9t/Lq9VIKShOHRtbZd7DBbWX6Bdh2XLWi3gamkU61CSOwksV5mcp
enan+KwYPj5E16ExVNPEpGsCAwEAAQ==
-----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 309636199400951611284104379982180440369201
 . . . . . . . . [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 2020-01-30 02:16:14 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-04-29 02:16:14 +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.hainanventures.com'
 . . . . . . . . [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 (4208 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 764160760254955230221555813143183098026486601034004668743748330436931102623227048266683563747173537870596509948144296194860622488871245379023432211027028178500683350821425601566451249388210210186675802157584473764908080773166365833419934628446240272770674424153746819866587399033738208409499343311310975418126319150097758985212364480761297429797939305903025358671231187951372109880087033328717113482948277169985544850277904685230587244429678099685752702546014331526575716302364804944005282102136089404391366010348129901280424560740426452609426168672839608424406143316684764847066598337854399230969235996733233464290587136305339238889779560887044351553332534516371542954013607580319379166213329143746810652306569129579529005712888292977025732700409198849730382379787004468315994950357544585521291098098393873815354830986107691882184367146439001999413491750908493275398134125768929766013623051959996948380722352397660617557745318987825698455387628593480437465406888347459582216186528825085988934965667690809513032117886421566024685696561274428649648079441008504912247343604014272010876141196887704725335361335744381058087878533568474876877925762070620666548933110414932698166404732454651586301983555097535984895031242179316204284716139
 . . . . . . . . . . . . . . . . . . . . [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)
							f7f0b8ecffedc21235a3eb49fdf2cc2580ac2d34
 . . . . . . . . . . . . . . . . [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 (99 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 (26 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.hainanventures.com'
 . . . . . . . . . . . . . . . . [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 (69 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 1.3.6.1.4.1.11129.2.4.2
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (240 bytes)
							00ee007500b21e05cc8ba2cd8a204e8766f92bb98a2520676bdafa70e7b249532def8b905e0000016ff472fc8a0000040300463044022075f3aa8883131a448d0f943ebe26856118f1b7289a10c3057b4f09b7771576260220219c4e1ae002bfeb1a4f29cd8dbc798c7acb9ee97354f758afbc2d590ea89de20075006f5376ac31f03119d89900a45115ff77151c11d902c10029068db2089a37d9130000016ff472fd05000004030046304402200dbcf55e144343ee4504410a7d4c8f82a1cadcce32df3198001f2cd4577f202e02204d40c54fd4a0289dde4fe05fae0515798ef2808fa9c24d5fd67b1718a499921c
 . . . . [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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