guangdonglegal.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:3d:69:b6:c9:69:80:00:97:9a:98:3d:3b:43:30:91:5a:1e 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=guangdonglegal.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:3d:69:b6:c9:69:80:00:97:9a:98:3d:3b:43:30:91:5a:1e
Serial Number (int): 282234600200166557911590592172208403077662
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 50:71:e5:60:55:c6:8a:2f:06:b6:05:41:47:c2:c6:14:7b:fe:2b:95
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): e6:64:f6:74:87:a1:d1:2f:46:eb:eb:a3:06:f2:3f:6f:ad:8d:26:f7
Fingerprint (sha256): 83:ba:94:b1:d2:b7:90:da:4d:2b:0e:ca:4b:ab:d7:8b:a3:a9:66:5b:a9:af:70:25:9b:a3:57:2c:09:b3:df:b2

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 guangdonglegal.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for guangdonglegal.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

guangdonglegal.com

Other certificates including the domain name guangdonglegal.com

(limited to 100 certificates)

Certificate

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

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----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-----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 282234600200166557911590592172208403077662
 . . . . . . . . [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 2020-02-24 03:33:46 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-05-24 03:33:46 +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 'guangdonglegal.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 685585161149313488218908220202688264870914638408523981356733429189801240486765778085382986006322016149678984705102659335284896923765268544800032397250906238238252254510023325342219610835121300267329623648942334369745230310778273783843118713435430911072059115450893966728541583504600122760261867075779204720635366550103759824044147762197699261618372370685226217707061407028940025034540730922974642914209700871082564249391770126771557871343089931966740526619360801993981704738093532108924067320177578845524083230609010932475831414081540580523679362224047571643386860134991375726267421664247273513083927400881854704882880230049888375432730636944239846674517029005519421196187712948471246534341670064140538923906460213232175392799371783080980106282285671465568873900588652758113651163484667608446530752467673878931672804879041221258188567138509266687791335756540996485776792360356162966029786671157506768010971725944462245734194165763690647625433965013375223214885422769003038642634703406716743478199681243058390310124415703580852970143498054200137931604258965425441139287527857336594238876328406902816586388681136661813191913282298161779182933670516959076986142298667748108416884451851110161925680173465322704294321753873072424373973133
 . . . . . . . . . . . . . . . . . . . . [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)
							5071e56055c68a2f06b6054147c2c6147bfe2b95
 . . . . . . . . . . . . . . . . [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 (22 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'guangdonglegal.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 (246 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes)
							00f1007700e712f2b0377e1a62fb8ec90c6184f1ea7b37cb561d11265bf3e0f34bf241546e000001707578f7f40000040300483046022100f4aa32a9cdfffe1370b646533a7c1cb28944cca2534c4865d958fe959b385d83022100c46377861e6a6336ce53063a22170a242455965a9362f405e6bb8e1450551f9700760007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c000001707578f823000004030047304502204ed1d35617156e1af8293052789c8a7e51c5b1643d32a1c9dd1cbc0e313f734d022100bd5af2ee70e8710730c4c1dc4f3412e7e4594a6f1578d22830340d3c607a782d
 . . . . [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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