www.lampmate.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:7c:87:c4:d7:3f:ee:d1:79:44:6d:4d:09:a2:9f:28:6b:a3 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.lampmate.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:7c:87:c4:d7:3f:ee:d1:79:44:6d:4d:09:a2:9f:28:6b:a3
Serial Number (int): 303712339128875695572397528746618645932963
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 50:1e:bd:3a:0f:18:18:bf:d1:7e:ec:86:8f:43:b4:99:a6:9d:6c:89
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 64:a3:9b:0a:34:2c:c7:3f:28:c4:7d:3d:e9:ea:98:5e:04:b8:f2:2f
Fingerprint (sha256): 7f:ef:bb:d4:2c:05:bb:3f:12:f5:68:a8:67:07:56:46:ec:26:f4:e3:1c:a5:c7:75:0a:8f:26:52:16:dc:eb:df

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.lampmate.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.lampmate.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.lampmate.com

Other certificates including the domain name lampmate.com

(limited to 100 certificates)

Certificate

The complete raw certificate details for www.lampmate.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 303712339128875695572397528746618645932963
 . . . . . . . . [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 2019-12-11 04:00:39 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-03-10 04:00:39 +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.lampmate.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 734770590916110756317812520854300221633150298013976028833786118283502766905409716956824506973687629194124191382962020888735500604388539422038305093008368878263370994496193303462221043891640700018814894627529020866397630512210746345481790038295864314876393452253002938734777433395086271356700445001599189729740998743793845901714513137039134861166535287302398901192602186102953415515618600444215636315771488768307126436742668888157579408862403191027818422819186966232419115907282588292762211496208431570654735453692420193260148003755903241065258185563846699816301830056796003980473244837241712772825104781229903022672274736143013611601805523147118551657455720327328538323186896966243245104353775280216993319916375352117794621405062537456456953367858399234307732334699461764051679673525097012263189797044638528501942137164767317089672677499037942154774627382699591756651181995619258235480702089828077416279548026943272964772123808030402089849621404825594675339350585728656828945354312709497966522114560052507294656346706608656338902647426667290317054961376818525219406274587134819808301776633257506135451894707376164446429278231579378118075306138306480605173145129247714980910729746468427992728658140681823230750246689495934806026342729
 . . . . . . . . . . . . . . . . . . . . [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)
							501ebd3a0f1818bfd17eec868f43b499a69d6c89
 . . . . . . . . . . . . . . . . [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 (20 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.lampmate.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)
							00f100770007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c0000016ef354a1030000040300483046022100a7a285d2219a3c148893838aaae8a8c857658bd0db7af461915ebac82f6b0a13022100fc5076408c91a3f5c3ef0c715da7a2d83d7d3f386c8d7ce33a8e5bca239c2561007600f095a459f200d18240102d2f93888ead4bfe1d47e399e1d034a6b0a8aa8eb2730000016ef354a2880000040300473045022100edc5f8823e4f71c4372d3337671deb27ed45cd6408580085c3e1b8ccd843adbf02201f766c3308d3a7f6f573d50281d8c9929465954e7c0f1050ae9c1452ea88ad39
 . . . . [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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