www.937.me

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:dc:70:2f:ed:36:29:50:ca:af:fa:91:0c:d9:3f:67:f6:39 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.937.me

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:dc:70:2f:ed:36:29:50:ca:af:fa:91:0c:d9:3f:67:f6:39
Serial Number (int): 336348100902589647014326553469443306419769
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 29:41:20:4b:9c:1e:5f:14:dd:b8:57:70:b7:2e:b6:4c:d8:eb:27:e5
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 7c:e9:0b:2c:47:3f:92:a0:09:29:f2:70:c9:62:70:c5:21:26:1e:a4
Fingerprint (sha256): 59:66:18:47:5c:9f:53:17:91:93:d1:3c:e5:af:94:6a:77:86:37:47:74:37:26:e0:14:db:2d:85:64:f0:7f:ab

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.937.me

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.937.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.937.me

Other certificates including the domain name 937.me

(limited to 100 certificates)
937.me
www.937.me
www.937.me
937.me
937.me
937.me
www.937.me
www.tassoridotto.com
937.me
937.me
937.me
myfamilyforward.life
937.me
www.937.me
816.me
www.937.me
journey1.world
937.me
www.937.me

Certificate

The complete raw certificate details for www.937.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 336348100902589647014326553469443306419769
 . . . . . . . . [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 2020-01-30 17:54:00 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-04-29 17:54:00 +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.937.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 766735837238349561284175166670405667787324499841899876119498420975348977772828157766763176054975404242933223674569046680262783927132143055796109799061247969164545272495598584176394836689522278041276411798247540879187494622719096581325116510863080850499890701649395418867817616583856783389060187140055524183360694322459838568975307535235216615039000037156760278776436314717518185043287019101366463079151994405718103296460411710554709695725368375472788849787883603987607916092906643633838369877710493405600166220575640517761188770008440494355894990824104453434078080468201902299775769591459936454482203301092095307210660721886901797535983191119083154848420417674271707115669646486351020187976843508314265191651964566120444975984347184828789657267063723045401184457970877926648864343270926524792117015424060987799117719434994284969529250244285523754804522929925599638104704589595030484171820043405602944221269671212090645745294704535699280782616082571835587748746181856823762968722022995885431766984577666434241696579293029809828822118908478785993539918785372917164591839402052915413393920380266628031596498745305473902505904971268771318342526021468381497110271856011555930880727801566452297419686971801113587655657776446868381397838191
 . . . . . . . . . . . . . . . . . . . . [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)
							2941204b9c1e5f14ddb85770b72eb64cd8eb27e5
 . . . . . . . . . . . . . . . . [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.937.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 (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f00076005ea773f9df56c0e7b536487dd049e0327a919a0c84a1121284187596817145580000016ff7cd8afc0000040300473045022100d872cc1254fb3fbfa0aaeb81f2697cd5689d99612e01a8ad2a9410520a6ba37802200ecad2a342f8aa11da6d3ae7d06b6660b4fcaccff99aed12507fa400b6674a1300760007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c0000016ff7cd8b160000040300473045022100af5f786e4354d9cde38a9c24cba9074df4fa3ebb3cd63f4200ad968d895723b30220119d1ca6e047e75109415f35dce36bdb48f1f88e6815a903aee8dfb9d5b72649
 . . . . [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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