luxurylivingindia.in

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:7c:7d:9d:8f:f3:4a:dd:df:03:24:1b:49:77:5a:fe:71:df 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=luxurylivingindia.in

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:7c:7d:9d:8f:f3:4a:dd:df:03:24:1b:49:77:5a:fe:71:df
Serial Number (int): 303698842903217200791014491693556057403871
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: f6:db:6c:78:9b:47:91:1f:8f:ee:6b:59:bf:f2:97:b1:9d:ce:ea:50
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 49:56:3e:44:cf:d0:48:0a:53:3d:1b:1f:41:61:95:6e:b8:3c:09:3b
Fingerprint (sha256): 8a:5e:d0:16:82:49:aa:80:fa:6f:87:e2:f2:76:ba:87:16:8c:bb:4a:34:4f:8b:ae:14:38:18:aa:de:32:3b:53

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 luxurylivingindia.in

7

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for luxurylivingindia.in

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.luxurylivingindia.in
cpanel.luxurylivingindia.in
luxurylivingindia.in
mail.luxurylivingindia.in
webdisk.luxurylivingindia.in
webmail.luxurylivingindia.in
www.luxurylivingindia.in

Other certificates including the domain name luxurylivingindia.in

(limited to 100 certificates)
luxurylivingindia.in
luxurylivingindia.in
luxurylivingindia.in
luxurylivingindia.in
www.sarahpyle.xyz
luxurylivingindia.in
luxurylivingindia.in
luxurylivingindia.in
luxurylivingindia.in
luxurylivingindia.in
luxurylivingindia.in
luxurylivingindia.in
luxurylivingindia.in
luxurylivingindia.in
luxurylivingindia.in
luxurylivingindia.in
luxurylivingindia.in

Certificate

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

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEApKhLhkWvU/+NvqbvGJD3
j7PWTQgRj/WPbV2s8jGEku9A7K6fS61KVdKz6fcNBjXeRQ2sP9WNoQnC2vQWLHTM
W4Bvi586b67ytO8bfKRndPSqWritaDDB/T5ge0m7+Gp0Rgz9/JWlwKumsFOB7sFX
deOV66vssDmQ9m88D61DT6Nihe+4OsG6vs5176YUhoa8saUXBjRPltOja7AIUUO4
/P9I6fPganwVMZrOtli4VnOiAKoTpbE2OKmdtqQ85dQ7zd2Cem7KHkfunYlYl0lV
sk/xotZK6UB6gUe6xlRsW8FH9+jVkj79bBHtQdqqWZWaj+FlG7t8QIx2tTzfD+Dd
1QIDAQAB
-----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 303698842903217200791014491693556057403871
 . . . . . . . . [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 20:22:45 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-08-28 20:22:45 +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 'luxurylivingindia.in'
 . . . . . . . . [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 20786071380658978879659341130424255609003736682458843189368487489195624414138387872596268977537878999249960927885530592687932161595252559430300952515006400471173990691295577858069763809967922657738527689333390031932295476534490183546214594423782761341738062662600821083340284728179281058900365323273019049068120069923323180809235825986884512885373035986273115657409929292142933699847910831544076334324318575287915852211956877877475704162122577627417613969697490712278168127371368342171204457032394358076385106690564930469348261118525924565240000833648963201017279569494265838587901023317168802372178727221643299577301
 . . . . . . . . . . . . . . . . . . . . [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)
							f6db6c789b47911f8fee6b59bff297b19dceea50
 . . . . . . . . . . . . . . . . [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 (202 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'autodiscover.luxurylivingindia.in'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'cpanel.luxurylivingindia.in'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'luxurylivingindia.in'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.luxurylivingindia.in'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webdisk.luxurylivingindia.in'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webmail.luxurylivingindia.in'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.luxurylivingindia.in'
 . . . . . . . . . . . . . . . . [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)
							00f0007600293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f4780000016b0a9faf57000004030047304502206a569e026fa92b42841ce36399f2c6bc1fb684cfb32fe893462068c4df23cab4022100bcb2879747a1e5c5473d075ef620a1458248f72849685a5605f3e02806da86f1007600e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe0000016b0a9fb1290000040300473045022100aa155061853c62b494737ad555cb216f93b48e1fed0e211412f35f94b6834f3502204a6b7a35087ce08bb66ad27d29ba1e1dc94a2f467101a971a2ad832da4491281
 . . . . [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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