servicio2000.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:ce:be:f3:f0:0c:87:eb:dc:c9:c2:f8:1e:ce:42:5e:41:e3 was issued on by Let's Encrypt.

With 7 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:
  • Subscriber Certificate: commonName is deprecated. (BRs: 7.1.4.2.2)

Certificate Subject

CN=servicio2000.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:ce:be:f3:f0:0c:87:eb:dc:c9:c2:f8:1e:ce:42:5e:41:e3
Serial Number (int): 331688845297100929835400359514246616072675
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 7b:2c:d9:cc:a3:7f:29:33:72:72:03:e3:77:e6:07:b7:b3:4c:82:65
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 7b:43:43:3e:00:d6:68:7a:ce:78:b9:20:e3:96:41:ce:7b:c0:e7:4c
Fingerprint (sha256): e3:e4:02:04:ed:55:91:2c:1c:75:77:1e:77:eb:5d:43:31:f8:9e:2c:48:d2:cd:61:0f:70:9c:d8:e3:f0:9f:2a

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 servicio2000.com

7

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for servicio2000.com

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

autodiscover.servicio2000.com
cpanel.servicio2000.com
mail.servicio2000.com
servicio2000.com
webdisk.servicio2000.com
webmail.servicio2000.com
www.servicio2000.com

Other certificates including the domain name servicio2000.com

(limited to 100 certificates)
events.gpmanila.com
saleemtraders.estore.business
privacy.immigration.gov.kh
datacivic.com
servicio2000.com
www.minecraft-v2.lazydali.com
dikke-tosti.nl
zeekse.xyz
servicio2000.com
applinks.efteling.com
servicio2000.com
app.specchemllc.com
servicio2000.com
app.specchemllc.com
timer.dev.resamsel.com
servicio2000.com
www.minecraft-v2.lazydali.com
servicio2000.com
www.durucicekcilik.com.tr
dikke-tosti.nl
www.dhomecooked.com
privacy.immigration.gov.kh
ecard.harshitajain.co.in
servicio2000.com

Certificate

The complete raw certificate details for servicio2000.com in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA7cl3kO0Qi2hOycMuKrKG
xLhHAHxIThqr6q7QUZxsF638VhDrgpY1DK1mC5SpV8d9LXaEoLvAqYFVl74yz+g4
3gUj2gkraDULnbuSIJrjLDp4+7HaHB8qvptRQP+ov3ZmS21srZnMJxR4Fj23vTN3
ROyWqA0IytsnEzINk1e/8YbCiyoGlPNIOHUapNJ8/YvtavquxQDWXXyaUKP1FPOw
DR9vvgENX4tpzUfUPlCrjcO3Cqd+j9tFiaonyNyoBcvvspz74JSCsDR3UyGesA3/
TPtl2aCfIARZ88/giLgd7QiwhmOcaMieJ5O31Wkk++UK0CiyFqP5AX/EzVZU2V3V
PQIDAQAB
-----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 331688845297100929835400359514246616072675
 . . . . . . . . [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 2019-10-09 13:30:34 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-01-07 13:30:34 +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 'servicio2000.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 (2160 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 30017825384565684335523281102976445057135258227105600922630075602544020443400332285610441370061730897078593269324445218217244271483067333216256705150156288946458583503324696265630952620701501078710821763992344747470064769620939269752789230641588251669921628401437984278377132828844293622831990713479623336358287573141279661906761340366119550634375257336150449486926715554708179934161628612221277162117306039853736268675223653255068725594936277094567725925738007996689627129134432520031425873304568475849261558400089508325037054854126346434852767040737884277883548447261348153611629507007530616439489431194306279757117
 . . . . . . . . . . . . . . . . . . . . [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)
							7b2cd9cca37f2933727203e377e607b7b34c8265
 . . . . . . . . . . . . . . . . [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 (174 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'autodiscover.servicio2000.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'cpanel.servicio2000.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.servicio2000.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'servicio2000.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webdisk.servicio2000.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webmail.servicio2000.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.servicio2000.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)
							00f1007700f095a459f200d18240102d2f93888ead4bfe1d47e399e1d034a6b0a8aa8eb2730000016db0edc0dc0000040300483046022100d61d2f65155fb505cefa8991f92d837cea51dd96ed1e88803fc8f08457417a5a022100959bf3e6ba8d705e3165661fd400f7c124f3c36622f8416159f4725816a1fb55007600293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f4780000016db0edc0d40000040300473045022063c5685b94353d188d5430c8a95ab0dbdbf590073cb62c923d4ea66fcca35ce4022100a627d342e8475f25db872367292027b31c015db043608b3a938d5e988871bbc0
 . . . . [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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