www.34176.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:dd:98:3f:6d:a6:16:46:15:04:55:28:32:2b:c9:e2:49:af 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.34176.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:dd:98:3f:6d:a6:16:46:15:04:55:28:32:2b:c9:e2:49:af
Serial Number (int): 336741632878810950441772481036996306946479
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 68:d3:78:1b:25:05:83:ed:2b:02:14:05:4e:c9:04:24:41:d6:c9:1c
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 9c:70:38:f3:7c:07:94:39:96:97:4f:92:ef:e6:ff:37:b6:ad:43:62
Fingerprint (sha256): 6f:a4:83:ab:1a:02:f4:d3:b2:b8:e8:da:09:4f:52:4f:4f:d6:0e:a9:bb:fe:c4:5c:e9:f0:b1:d8:65:2f:6c:51

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.34176.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.34176.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.34176.com

Other certificates including the domain name 34176.com

(limited to 100 certificates)
www.34176.com
34176.com
34176.com
www.34176.com
www.34176.com
34176.com
34176.com
34176.com
www.34176.com
www.34176.com
46194.com
www.34779.com
34176.com
www.73955.com
34796.com

Certificate

The complete raw certificate details for www.34176.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 336741632878810950441772481036996306946479
 . . . . . . . . [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 2019-05-30 12:39:14 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-08-28 12:39:14 +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.34176.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 830274788975468020125059457747982391621001214852815971073066444612312343553759293105223858799267429647363406720812863497958148820721154575302412047717356519026118912407133107803821821104041052565400740474259542679411892371258526917532392334927418336375785233409714567095312504215345578455311246098941960530456585979536570068185782471137567091427451897698456859001706230393870276527395264048097538174002958616983567702523205580193982305890176793611258699563311749083905949386624662372956584640917494005404177725032737356696151275493300231442370514620811443829303652691805391249625837391713754985327593103664561225536544434384549312140726563818663512880577058865738393318345701434529546184850949980208731975874579109279303384388058329852236804288751748939884804161493689873816687729442287001735306244005304082842584426309926862197882920919028227399776269516931057380764479682783544485189890455956901516068758105500183637173166694328535910312583838654913605077530120028931515943341256403508504320397178113379241731126077196168785376332368649263858803836192644983250867543907773133877366922033924878467278785448268466877744755122510656101868986217786686885371260247549750046076501893218023802519246143112044847884926440038585562211561699
 . . . . . . . . . . . . . . . . . . . . [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)
							68d3781b250583ed2b0214054ec9042441d6c91c
 . . . . . . . . . . . . . . . . [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.34176.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)
							00f1007600747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc560000016b08f752910000040300473045022100f46868725b430591bdad9e10156931c3f24f634c9cac1c59f33050904a6edd82022039b010da39aa46ae5e9f791f5d93cdc3f0f89b6c18436848d84d8fc0266f9f6300770063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d0000016b08f7528c0000040300483046022100f7ebab4bf6f1a62a372edbd0bcfc868cc031322fa0608c3db42e84091af0615d022100d5b6bf5e3dbd9701e0045d648845587b6fbada72e989a051f02f02263e032148
 . . . . [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)
		000bd47b5edac646008f790360b3428b199bef8b670cf40b13ca43e96b0b9f648d63845b10f8f6869141985fc2943b71a0d87b522e82444d8f20df85bf2f92b031197b345f2d005d3156d2fd89ba1ce777e8d9aef1496ebb1a8f2aa41392dffefce0f0fd279476a6724f472ad138d14a9e872ceb39d0b52681c4f77034e9df65ad429d9d2a6e3fb8b03b7930b225e9756b43e08ed7c23bdb6996a7f3ccd2be5681f616297f6f636920d61b83d6b5803e4c6fed31b74e3d8c752c902183b4b5682138dc0d3118898dba7c928d5daf20f282ad439a7deadbe0bc6a0269db3352ee357fdcaba4662801b9f99d42ed7d8246ca05d36b194331fd04a60f2f2967957d0f