www.854.me

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:02:14:3f:5e:26:a1:8c:c7:37:e5:b7:37:41:ad:33:5c:e6 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.854.me

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:02:14:3f:5e:26:a1:8c:c7:37:e5:b7:37:41:ad:33:5c:e6
Serial Number (int): 262044336113347573074174222343505374829798
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 2a:e9:c9:ca:7e:cc:fa:58:c5:95:c6:76:96:11:33:31:30:45:90:f7
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 61:89:1b:39:1b:d4:8d:0e:d7:e6:d7:b9:b3:7c:15:b4:8a:9b:5a:5d
Fingerprint (sha256): 8c:c8:0e:cb:d3:49:83:1f:4a:13:88:b9:92:69:cc:02:e6:a2:b7:8d:d5:21:6b:08:90:55:4c:04:51:19:a7:5d

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.854.me

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.854.me

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.854.me

Other certificates including the domain name 854.me

(limited to 100 certificates)
854.me
854.me
854.me
www.854.me
seekingtruth.life
sailboats.world
www.854.me
854.me
www.854.me
854.me
www.854.me
www.854.me
854.me
854.me
plantbasedprotein.ca
www.82759.com
www.neoastrian.org
coconutcoir.ca
854.me
www.854.me

Certificate

The complete raw certificate details for www.854.me 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 262044336113347573074174222343505374829798
 . . . . . . . . [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 2020-04-07 17:41:59 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-07-06 17:41:59 +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.854.me'
 . . . . . . . . [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 785763901530257915347576833559382087833910377592276704999980030537066674820721240623692591607245192928335411082251902709108320129412942876555023376621358360947545783728469834333167699204014359214733902545388216450289588411069616337987327100394261722379766914230410477406544439587864599472576768936970398336112874437736712391358424526581026101344254159709166480943296327369484688989838044618973709082370767812602864710707017899525994146462657134756370064450578849252270050045601474756985708906069232770313397998301702690197033064801282381531458302054708654777748379825830333169625669509886459045922273957844769420262295636762256772420158704346484879256559858718626582799053833053033491672962850399610444544776096603258802387532248462465323193153949631566152893206719207589533624733325041788994409117997339932624389160303772290245980170796814847614624742908255109983977323038587083312175575602302589291732438817827858256128927012498938281160266790711466360164147186978032141453999892852815101061069537758932456422257258748740322843081801816607724442509036340197862283466170748873358488047169231600904513394372370187720350020804345757351444444658834737404687654371715507539185270790627993824957456871045324128217613181270740868602620203
 . . . . . . . . . . . . . . . . . . . . [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)
							2ae9c9ca7eccfa58c595c67696113331304590f7
 . . . . . . . . . . . . . . . . [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 (14 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.854.me'
 . . . . . . . . . . . . . . . . [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)
							00ef0075006f5376ac31f03119d89900a45115ff77151c11d902c10029068db2089a37d9130000017155f2fcdf00000403004630440220074eb2254d638d82e925fca766f7207d44ed15a37bca291cf2f536fd054e431702201313395fa3dd8b0efb2a692459e35824c066f397f28ebd17e7d379da535ac9ff00760007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c0000017155f2fce000000403004730450221009a2f2515320deb22c1b16d5c394987eb0e94f307a9f1730af6dbee1a24bac5720220240107fe42ac0f34e9d61476f6987e1548848391eea5293eb9420eb236ce18c4
 . . . . [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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