www.47205.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:f5:f9:29:63:a8:84:6f:65:86:7f:c7:0b:77:89:aa:5f:be 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.47205.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:f5:f9:29:63:a8:84:6f:65:86:7f:c7:0b:77:89:aa:5f:be
Serial Number (int): 432149516299102422870722455814958956044222
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: ab:9c:27:4d:06:9e:37:6d:9f:27:6b:4f:47:41:f2:cd:23:f7:7b:e2
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 65:0b:eb:4a:5e:41:b8:25:c7:a1:6c:12:ca:75:d2:d7:aa:02:8d:0c
Fingerprint (sha256): 54:13:0f:ed:74:7a:76:96:7d:be:df:6a:00:6d:19:b3:8e:3d:d0:2f:dc:f7:5d:fa:e4:48:3c:1a:9a:50:01:c6

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.47205.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.47205.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.47205.com

Other certificates including the domain name 47205.com

(limited to 100 certificates)
reggioemilia.org
firstascent.ca
47205.com
sangu.bible
www.47205.com
90546.com
www.47205.com
47205.com
47205.com
marshall.mba
41945.com
www.47205.com
discoveryfluk.com
47205.com
47205.com
www.47205.com
www.43826.com
47205.com
www.41316.com

Certificate

The complete raw certificate details for www.47205.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 432149516299102422870722455814958956044222
 . . . . . . . . [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 2019-12-05 18:59:46 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-03-04 18:59:46 +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 'www.47205.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 810442115113933001444449091159492381709498800493620832936238968393159997365936041346301140597727288822418318679127654632473783156912065923619676442668644386090572307849993037418124387301771480504648653584040805714399110958671115511523780925446045148285941470089324476136513612420912549123620783059657686457927451474448958985171685422782720115578968590612398470686304790810314540690461555474744485401150523355832373130601933218235723760236705212259330070042351021868355550460464550655693519470821041897615191550064052052052534014079602257692232110394807901737702939060140699633925410797912068124593743786001231616645948603435640541883669760059391158429900715075675955812386600763124890195934331258098455273643421190700005868884149896258086548648356940581124752242789868874317285114020367738316271093670357118969133345298672888485182477083072200385444950489897158878588093952099661345200209740821846224440915855430335000080233836674034577020443791339644374909822905749697511092933484783141174461945471823776243228661630089365817038025891998154320964346897066174214350374190150730909538713220755470828393399009289617430098137766279862360445022513075391876662888355642086522393473852969414667157867206166987684766335550830646728484336679
 . . . . . . . . . . . . . . . . . . . . [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)
							ab9c274d069e376d9f276b4f4741f2cd23f77be2
 . . . . . . . . . . . . . . . . [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 (17 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.47205.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 (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f00075005ea773f9df56c0e7b536487dd049e0327a919a0c84a1121284187596817145580000016ed7a5a078000004030046304402201de10e3341fe405ceabfa26376b83d27772999bc77ab2ff972783bfe1d37d221022038a0aef6d63896a139bc76777359858a111384fd9b0af397938dba1bd49ac83b007700b21e05cc8ba2cd8a204e8766f92bb98a2520676bdafa70e7b249532def8b905e0000016ed7a5a06b0000040300483046022100e4144a7df20a39a579f0e140e16a93c94dc8854dece6c44f7ad7220395b8fec20221009bc0d62b1f76ac56c98d1efb7871f9b9917f7422cf093c439c6e0971f6511612
 . . . . [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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