82537.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:f1:97:d9:0a:5b:c2:24:33:00:7a:48:ca:34:87:60:89:d3 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=82537.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:f1:97:d9:0a:5b:c2:24:33:00:7a:48:ca:34:87:60:89:d3
Serial Number (int): 343546748589102676668347953054277622073811
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 88:6b:d4:da:87:fa:ee:b5:d9:06:eb:0b:70:65:a2:54:91:02:07:47
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 9c:30:68:3c:78:9f:92:e8:61:e0:03:9d:a8:ad:65:1c:d3:d6:e3:44
Fingerprint (sha256): 89:46:f1:f3:49:0a:cb:1e:53:a4:5c:c2:df:6f:79:db:08:78:60:e5:1b:68:53:7e:ec:2f:36:31:92:ea:e3:c1

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 82537.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for 82537.com

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

82537.com

Other certificates including the domain name 82537.com

(limited to 100 certificates)
www.82537.com
www.82537.com
82537.com
www.82537.com
www.arno.co
82537.com
82537.com
www.82537.com
33817.com
82537.com
82537.com
corrado.org
www.82537.com
78327.com
82537.com
82537.com
www.82537.com

Certificate

The complete raw certificate details for 82537.com in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----
MIIGSTCCBTGgAwIBAgISA/GX2QpbwiQzAHpIyjSHYInTMA0GCSqGSIb3DQEBCwUA
MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD
ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xOTAzMjMwMDQzNDFaFw0x
OTA2MjEwMDQzNDFaMBQxEjAQBgNVBAMTCTgyNTM3LmNvbTCCAiIwDQYJKoZIhvcN
AQEBBQADggIPADCCAgoCggIBAORHbi0VTSsSgAgK6+mxPMOKI8KlQmmXkVSdGpno
e3JAWgqggQJVi3lYBHApR7enxmAgMPjN0vcbbHCm6IiMQ7/BbxIlGXJf1lHZHspW
2b46+S/+dF3cvJb9XLwcxP4svHBURQxRZ0H961Cq07byXlFmkVPJNxtEOlTQc5Kn
bR3Fnau1Qtun64niwhbl6eW5sVUL77wu4yMsjLJb/MgIpWlIImJFmCq4sHIN2V0y
nOQ+T0mr3qzHG6CWDTBq6qA/S4d9Ub/1PQ2pl09r07aefXbEqyC4M6jQ4JejxTFZ
XE2VY8dP7x/z2s7g0XjfRGEvRUsG0lwm/ijsmqNa4nC9T9cJE4Po1VwdWmIEJq5D
9TU0u79ECGxaiFOTQo5PSkvJD9Y3YH46H4ps2koUS6OkkngJ3zh4x5QeK2XfIx69
NBSvZBoQI09YTPyHO31uZs3+lvKX7V0BhJwhjWQoA1U74mxcQyvxOMxU+U8Oc5dw
pwOgIuAH4LfMpX6KTGqsNU7KQ/Cj0Bh1DJ111/070wW3dSGiaSpgOcpk8OjB0oBD
NBiWgM+TXNRcY8qOFRmJ+Fj0iHXTh/m7lc798GIkL3jGphVfvQI8lljw4XSyEmun
upggxcf5jU//zMm6IIxom1ihuBmGqy8SFUTeqZ4fSz6Sw64hExxRnbOq7ZtY/urm
Mvv1AgMBAAGjggJdMIICWTAOBgNVHQ8BAf8EBAMCBaAwHQYDVR0lBBYwFAYIKwYB
BQUHAwEGCCsGAQUFBwMCMAwGA1UdEwEB/wQCMAAwHQYDVR0OBBYEFIhr1NqH+u61
2QbrC3BlolSRAgdHMB8GA1UdIwQYMBaAFKhKamMEfd265tE5t6ZFZe/zqOyhMG8G
CCsGAQUFBwEBBGMwYTAuBggrBgEFBQcwAYYiaHR0cDovL29jc3AuaW50LXgzLmxl
dHNlbmNyeXB0Lm9yZzAvBggrBgEFBQcwAoYjaHR0cDovL2NlcnQuaW50LXgzLmxl
dHNlbmNyeXB0Lm9yZy8wFAYDVR0RBA0wC4IJODI1MzcuY29tMEwGA1UdIARFMEMw
CAYGZ4EMAQIBMDcGCysGAQQBgt8TAQEBMCgwJgYIKwYBBQUHAgEWGmh0dHA6Ly9j
cHMubGV0c2VuY3J5cHQub3JnMIIBAwYKKwYBBAHWeQIEAgSB9ASB8QDvAHYA4mlL
ribo6UAJ6IYbtjuD1D7n/nSI+6SPKJMBnd3x2/4AAAFpqDfIRgAABAMARzBFAiEA
m1uEjN7OoYa/+zpOi/ZaZJk+NBhaBEG4deCvvbUo6/gCICOp/gAWbhhJWBfrMWPm
P0UqrfUQeATUPR2mbA8KzP9ZAHUAY/Lbzeg7zCzPC3KEJ1drM6SNYXePvXWmOLHH
aFRL2I0AAAFpqDfIfwAABAMARjBEAiAfO0SHbmU4foFg+jrc/NLRwySJJEr/Opal
QJiUbMDnoAIgYwTnBlfQ4fFnXG9vcXIV9nI/NVovbjy2IgPxgtOmi50wDQYJKoZI
hvcNAQELBQADggEBAGmPAFPmpGQWxevBPFkn1GLmpStFP9pOG4Wn/A9vvYI0bWbg
4UL47OVG67yT4E7mMdQJukVif/b09OG68faCFqDWT5SilNO6R6BYcLoFlxa6AXoF
tMLSjShtfJjmQhdghl0/z8WJLzvfZFgdN2OTnBfumm3o83J3mySq9wtNVCaxiSKu
Uw4sl82zZHft1g2jjz66gCbOGlR6ZWNqayS5bo8Vj5UJA2To6ieq+BLHkNjHeG2I
+GzoQqpHXYYZ0V13oDZ1yGsZdkhCGaM6Jjewz2pIobzmhk3Uq9XmGWyG3vRgVgQr
n8cVKrBPL7fWrKzSeektwznS3GABD27r7bSkqkI=
-----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 343546748589102676668347953054277622073811
 . . . . . . . . [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 2019-03-23 00:43:41 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-06-21 00:43:41 +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 '82537.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 (4208 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 931297169802881760447296531342302804909440442306794061671758579462842600689853265336361051661579808789422155398637001081338133973690759696206257915833637599121910984697285185002010965130850984156831064504082241340624847040605813645872873886384395507612336800525104804077905826339885029816220379402169599207987053453744780120244899119694807523625115543748716521733570473677137747018174995256636427571074950949603427735425217272942213387862905628092858722697405504686984244004653384528846505839498182506526861344820407331256953446360913912990189028626918083963480699337472902111198081496371317077384032556891455649060930001663735828984018882131943727167947544238402054310544746242345091582126506215488937434394904712304742233378530997430714542777124132718252236939899332523762761296825350248965054828853272858852371163162955834667071589129328110572455202274899854656562801512977209392503390958639075265342007385118882461257861267285124793732678313954741806643944849693269318844630718659700846467472155007326143348912375041816478758993197282276853237050014351433520536169161922463967692580877755516730707146860212686702531843104653465546329433794252907485190780972089370277514503600222856497124337616281529766822744343484198383212755957
 . . . . . . . . . . . . . . . . . . . . [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)
							886bd4da87faeeb5d906eb0b7065a25491020747
 . . . . . . . . . . . . . . . . [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 (13 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String '82537.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 (244 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes)
							00ef007600e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe00000169a837c84600000403004730450221009b5b848cdecea186bffb3a4e8bf65a64993e34185a0441b875e0afbdb528ebf8022023a9fe00166e18495817eb3163e63f452aadf5107804d43d1da66c0f0accff5900750063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d00000169a837c87f000004030046304402201f3b44876e65387e8160fa3adcfcd2d1c32489244aff3a96a54098946cc0e7a002206304e70657d0e1f1675c6f6f717215f6723f355a2f6e3cb62203f182d3a68b9d
 . . . . [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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