www.34883.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:c1:58:48:7d:6e:8b:d4:9d:61:8f:78:b1:63:42:80:75:dc 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.34883.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:c1:58:48:7d:6e:8b:d4:9d:61:8f:78:b1:63:42:80:75:dc
Serial Number (int): 414240988995844570924209702049804944700892
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: e4:56:43:20:2c:a0:4c:ed:cd:9c:c0:27:a4:d3:e9:db:35:25:d6:86
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): a8:93:53:95:79:a9:4f:0e:62:ee:aa:a4:dc:d9:61:9e:43:50:14:cb
Fingerprint (sha256): 68:da:e4:51:0a:0e:42:53:b9:b4:9a:6a:c0:7d:44:fd:33:ec:a5:5f:c8:35:d2:92:48:df:8f:13:5b:47:1c:fb

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.34883.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.34883.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.34883.com

Other certificates including the domain name 34883.com

(limited to 100 certificates)
www.34883.com
70223.com
www.70263.com
www.34883.com
riskpage.com
34883.com
www.34883.com
34883.com
34883.com
greennewdeal.world
34883.com
34263.com
www.34883.com
tsaangi.bible
99436.com
life.bible
34883.com
www.34883.com
34883.com

Certificate

The complete raw certificate details for www.34883.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 414240988995844570924209702049804944700892
 . . . . . . . . [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 2019-12-02 19:23:32 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-03-01 19:23:32 +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.34883.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 679921216722499779400799519043563005083855362358840629149578850876195059149878171805396969943541322428718318932178386294589213748173345902350150219065056991392927672931439162948092115906010726171661897131129535790511589719619443953276767970426610054250973524695528759190015987535976198662042465393035468535367170781251978547069132534322971129664122176344995401980632654455389431996181578893443733908194434892035092152358497888022853097157744646554638467627610647980763876068828695699577377566616515455385990077727371655367031286938550874701609975895170647487656605671591687763566403748194995973363084011835151316580492772059569476711504473848133093453320218605969360261596242978055632338262536297506249840977164858067946704654805616057295462311394724202059488471455175359131772898678057785678711409549356947114808996821075318162938721163827020810712899934512734544955074682773056473379714980987491792435632221182126719945707153353987796492037886741859781264868224540609242790896458951538534138092904649357974471270250012176994721518036053992840634062285849112320279504660870614987013346419902718318722021022234220520541620570740675089696088035669937290608010846935729963316645171934049768006004886801232715602753357848196450945865239
 . . . . . . . . . . . . . . . . . . . . [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)
							e45643202ca04cedcd9cc027a4d3e9db3525d686
 . . . . . . . . . . . . . . . . [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.34883.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)
							00f10076006f5376ac31f03119d89900a45115ff77151c11d902c10029068db2089a37d9130000016ec8484f430000040300473045022100ece80bd969f24bfef7bad0b35e336b73878b00b1a4c24201fdceca2e2dd79098022031487f453437deda5e9ebb3c140529badf07edcbf005031f42b0f0b65acf18b400770007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c0000016ec8484f480000040300483046022100d6138f25449789c0a947191edeab593c534999aa4cbf95200d5cc1a16e59d85a022100b55b263204254525c2b2106db91ee1c63af6096e269092a98a06cecfa4052bfd
 . . . . [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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