drama.vc

Issued by R3

About this certificate

This digital certificate with serial number 03:30:6c:8c:c8:3c:f6:a3:00:84:fd:2b:27:ee:20:85:a4:ff was issued on by Let's Encrypt.

With 17 subject alternative names this certificate can be used to secure multiple fqdn's. 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:
  • DV certificate contains a subject common name, this is not recommended. If certificate policy 2.23.140.1.2.1 (CA/B BR domain validated) is included, only country and/or common name is allowed in SubjectDN. (BRs: 7.1.2.7.2)
  • Subscriber certificates use of Subject Key Identifier is NOT RECOMMENDED (BRs v2: 7.1.2.7.6)
  • Subscriber Certificate: commonName is NOT RECOMMENDED. (BRs: 7.1.2.7.1)

Certificate Subject

CN=drama.vc

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:30:6c:8c:c8:3c:f6:a3:00:84:fd:2b:27:ee:20:85:a4:ff
Serial Number (int): 277814699013902692827223091149192852514047
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: b4:5f:dd:a0:e4:73:b2:45:13:fb:9b:ca:b8:b3:f5:06:d4:31:7b:ea
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 73:74:63:a1:c1:f0:2e:d9:16:da:a0:97:69:0b:11:df:aa:63:5a:e1
Fingerprint (sha256): f2:76:ca:a2:1c:0b:70:46:55:c1:d2:ea:bd:38:0f:7c:7a:50:fd:db:d9:ef:47:7b:7b:35:4f:fb:bb:59:35:15

Issuing Certificate URL: http://r3.i.lencr.org/

Revocation information

OCSP Server: http://r3.o.lencr.org

Check the revocation status for certificate drama.vc

17

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for drama.vc

Public Key Algorithm

RSA

Key Size

2048

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

alphacontracts.com
chicken.vc
dailyroamer.com
dodgeballaddiction.com
drama.vc
draw-hard.com
greercounty.com
kanuschule.com
newyorkmedicareadvisors.com
nogacharities.org
nuryol.com
opebsea.com
rxsugarpeptides.com
serbito.com
siliconvalley.blue
stlfinance.com
xespo.com

Other certificates including the domain name drama.vc

(limited to 100 certificates)

Certificate

The complete raw certificate details for drama.vc in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAux1lsyXK4iMdG4VDlJLM
tMp6uupFGHKDILE6VpPVHhf9kpy/B5tA41JXYSMF72dXtYZOD0QXOVUhBb//uXau
TNRL9RUxVcsDg+xhEvmx5JgFOjUX5To3QEFWafEhj74cBWUNLPHRZ1zzgsD6AiQZ
yrYucYeZDSOnHui/fgaO2UBh/lOlarPdpeBUxzt1rCjLPIVfY4M0sgRqncC5xqxd
SP3XLN8jGeU51hDQLvWTAJkYzdoMvNqjthiJdvr1UIUQRk6ZDzCgcag86T/J5ri7
c7UkVvAskSejTw88niW0SvVRXkvB3B3iwy5WJ+nKjv5p431sOYYQbE2wnrAJ7Ssf
iQIDAQAB
-----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 277814699013902692827223091149192852514047
 . . . . . . . . [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 'R3'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-02-17 23:01:49 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-05-17 23:01:48 +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 'drama.vc'
 . . . . . . . . [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 (2160 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 23621059360224266389478264714793141930987963914353300670665000974777581747607914800798193223051913074376726749366793135853556734360071706563728148704649791808942592621155699591932311113800178755713370875111215036747054096113551045220120285754935530868628646493476290839574161051017680160842646260712601271218811031714754096008501023729343834454661986063293974855099057628136509610223485008983129858604836556692192619578011722272431427583677379904846056627956511132086464723025231946781091168287000531933091377843662340036842455631824497978755844699501932807388521099674262277208540202621984325584637508443812617985929
 . . . . . . . . . . . . . . . . . . . . [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)
							b45fdda0e473b24513fb9bcab8b3f506d4317bea
 . . . . . . . . . . . . . . . . [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 142eb317b75856cbae500940e61faf9d8b14c2c6
 . . . . . . . . . . . . . . . . [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 (73 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://r3.o.lencr.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://r3.i.lencr.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 (289 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'alphacontracts.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'chicken.vc'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'dailyroamer.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'dodgeballaddiction.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'drama.vc'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'draw-hard.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'greercounty.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'kanuschule.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'newyorkmedicareadvisors.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'nogacharities.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'nuryol.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'opebsea.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'rxsugarpeptides.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'serbito.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'siliconvalley.blue'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'stlfinance.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'xespo.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 (12 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 1.3.6.1.4.1.11129.2.4.2
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (247 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (244 bytes)
							00f200770048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018db984dea80000040300483046022100bae85abbfcb0f4f5e5ba378794d38a6756b89ef6249bde08d39795ba7c8027de022100d6d09e6b3c074568a2590979754371a668c53d4e852b1b880ab66243e93045bc00770076ff883f0ab6fb9551c261ccf587ba34b4a4cdbb29dc68420a9fe6674c5a3a740000018db984e0de0000040300483046022100e6b78101cb42c6ce744a8214c6c2b8836420141ee37913b8cdcf74f6afd7d007022100a570949aa38b57783eb14f2c0ff38c8a0424dad5cff79e66abf863c2cb6a3aa1
 . . . . [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)
		00236690d8220609f52e110f0be91144d50b48374e6af656ec39f4ede5764bfef3facb525eb1ee2fcb90126b9390a0f34286c987bcc46780c774c1313c5c36722375de60f02e1a04d65eb1c8d37d4d00e495ad30ae7187ac25e0e96a43911187dbd439ae735c0a895c6fca4f42cf0a550e3df93f78f1467995fe886d220f82b2f16bcca971cba9f5adeaf5e7ffa8427567ef10da105efee7d053076688bdb7a9d8532bff75f7bd0fd569eb231a8e7ef2ad0f5a5a5aedffe28f7c6395d6b1edc7fcd0efadb38cb0312dc2b5501aa556080fdd9e4ba25e0248664c71406e0c34bba454cbe538155b85da80fe4c4396a4329f5b1e4c71076467e0aa2d889bcf25ecb2