progaminglaptops.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:08:0a:aa:a9:43:a4:c9:d4:6d:40:a4:d8:45:34:6d:1f:df was issued on by Let's Encrypt.

With 8 subject alternative names this certificate can be used to secure multiple fqdn's. 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=progaminglaptops.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:08:0a:aa:a9:43:a4:c9:d4:6d:40:a4:d8:45:34:6d:1f:df
Serial Number (int): 264073295134158557171450086577724273270751
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: a3:dc:27:cf:24:33:10:f5:df:03:1e:86:db:13:c7:c0:0b:6c:d8:06
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 90:49:e2:44:56:bc:8e:31:08:4b:d9:15:61:f0:90:12:90:fa:05:3d
Fingerprint (sha256): 5f:d9:11:21:46:43:3c:9a:80:2f:58:9f:6d:ea:aa:6e:b8:f5:fa:fb:3a:7c:4d:5b:7b:81:a0:63:fc:3e:1c:09

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 progaminglaptops.com

8

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for progaminglaptops.com

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

cpanel.progaminglaptops.com
mail.progaminglaptops.com
progaminglaptops.com
progaminglaptops.qualityespressomachines.com
webdisk.progaminglaptops.com
webmail.progaminglaptops.com
www.progaminglaptops.com
www.progaminglaptops.qualityespressomachines.com

Other certificates including the domain name progaminglaptops.com

(limited to 100 certificates)

Certificate

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

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwlzTCyaO1eHEpBwlQhQY
9Qm+1AantX2jXD/qxjypfbLlRL3dqIbgc9q41qItkgm6/YV2foEo5yYR8iA6yZpn
Xd5XELXeixgkdvcoU7s1ICWS7R+i02B1a7hgDxUviCsxMx6quu+FQXyvvsaRxMYz
6dxDSSIIK0kcwuNRxq5nRnI7pBFr2JshjiNkE9h2PKe+augl5RbZOZzJVD9lWp3/
ktBqsWgnSBdRZ9FaSLQsNfqLHehO3t/JHdFqswWQpvjhqG8p7vJ3CiHocT2vTEk1
CgIme3ZxLMTFeM13jk5U+qerckCL8cS+fpYgXsmeLK8BBgZkIqu4lCV3SjbVPttl
dwIDAQAB
-----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 264073295134158557171450086577724273270751
 . . . . . . . . [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 2019-04-05 06:59:49 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-07-04 06:59:49 +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 'progaminglaptops.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 (2160 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 24536004575577888385246104304531558623046446689520105888275183402693178325633468202280210055941273268371150215025465402756720630290077333840419473525547458240894585669462413781356996031463979280596994639520525644671144746016231136337708964128512430553971781577661703906250639414450831260936957733585407479158162700293123621231242951709593877251931582279627810845139601121170532356571824312008944498893445414550414146635415983189106323502633751631084973665660855143547724852283836541095973904956608754577261292753322915674676178484535260357588235236465744038084369631067602376219323305754554757391289031255579135010167
 . . . . . . . . . . . . . . . . . . . . [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)
							a3dc27cf243310f5df031e86db13c7c00b6cd806
 . . . . . . . . . . . . . . . . [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 (264 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'cpanel.progaminglaptops.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.progaminglaptops.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'progaminglaptops.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'progaminglaptops.qualityespressomachines.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webdisk.progaminglaptops.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webmail.progaminglaptops.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.progaminglaptops.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.progaminglaptops.qualityespressomachines.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)
							00f1007600747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc5600000169ec82d20f000004030047304502204f73047e8690fed9817ad6d94df00162990f059fb441097b30cd161ed3573c7902210084d3f6fb97be0401ec341bfc5fe3f725176bf85f1c1e9d7f7957a0ad4b5df189007700293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f47800000169ec82d00a00000403004830460221009afd4e3e1c3fc3c01bf5dc5341a73564ecd9b14e1bbd82bc9466b4c346f59274022100d430d3487297a84305e6b44568ce17cb2348638d1f4df35de735db5444fa7584
 . . . . [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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