39782.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:6b:34:98:57:c4:5e:d9:2e:aa:8b:f8:bb:d1:aa:90:21:18 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=39782.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:6b:34:98:57:c4:5e:d9:2e:aa:8b:f8:bb:d1:aa:90:21:18
Serial Number (int): 297816981920852177968335406690519305167128
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 44:e1:e7:47:28:a3:c0:25:44:e4:c8:17:58:dd:29:ac:2f:66:4f:40
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 83:91:fb:be:a4:e6:9e:47:a4:a5:27:37:ea:13:8c:12:d2:57:06:9c
Fingerprint (sha256): e3:3c:e3:30:74:e8:89:1f:11:9f:7c:32:d6:7e:6c:5e:61:84:ec:93:61:c8:05:d5:78:de:2f:e5:49:ff:ea:e8

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 39782.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for 39782.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

39782.com

Other certificates including the domain name 39782.com

(limited to 100 certificates)
www.31282.com
52823.com
39782.com
www.39782.com
39782.com
39782.com
www.39782.com
39782a.com
www.39782.com
39782.com
39782.com
e-mails2.com
www.39782.com
39782a.com
39782.com
www.39782.com
39782.com
www.39782.com

Certificate

The complete raw certificate details for 39782.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 297816981920852177968335406690519305167128
 . . . . . . . . [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 2019-12-23 00:35:41 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-03-22 00:35:41 +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 '39782.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 688005589113369439625977693644829306100372228787467447620683962859015272977697129204671095301075335764918866682405924229767208342387341946075766047025239514473190248049621058022484952290211460721658061261484190328750078530025491163469822462657561432929139615415738347266469737571327184596602795770074144427576058308260573931720441768690630632653182675460471748088763118742561532395374442607269853628332335865411526174800527455458412728885904148424837996179201131518819272910508737312518465531092741190882624169050077825896829218415090712486161641525105220971408512082377136209735403593143022235310760877585985810601467696907482110541186755203369487773207227613416192813701143391542258990735189636361694700479426721577251271180453645903276635509834740341206960622163245062363815821268165202165974241616759785445981411077302739469903195847619746584810648575437284066251884478032031658675215192157982906294190931634308120367434946425196116662610854619165848329482130458788723947780898950641004820451034586309717824814631586618073787586702323187910329093318108153087658645905306973667020220894087910753399432049340512786907083828326820600141122126303921072437038102330427247838781844529813185094033412610282675649398991769820439031114167
 . . . . . . . . . . . . . . . . . . . . [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)
							44e1e74728a3c02544e4c81758dd29ac2f664f40
 . . . . . . . . . . . . . . . . [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 (13 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String '39782.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 (244 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes)
							00ef007500b21e05cc8ba2cd8a204e8766f92bb98a2520676bdafa70e7b249532def8b905e0000016f306546e6000004030046304402205d1d93d4566f0a9a0ee021b0ea238caa1e3fbb4e88e45f93b8d3e2ff054a5f0602205fbeb813c3292f72a832c7b895bf87dddfef8357f66dcef4de9fe614d06507f30076006f5376ac31f03119d89900a45115ff77151c11d902c10029068db2089a37d9130000016f306546f4000004030047304502207aa9a21fad443aa1dc903b016a1bbc82af143893d21c67f9b232ec166b147164022100ec1eab316af32de627b42552b3004a57e2e53c43fac649232f0a048a8b36d262
 . . . . [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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