hfdco.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:ac:c0:d4:84:16:f7:12:95:e3:df:2a:b5:b7:0a:c1:75:55 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=hfdco.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:ac:c0:d4:84:16:f7:12:95:e3:df:2a:b5:b7:0a:c1:75:55
Serial Number (int): 320121740126904421409887944807579490809173
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 74:63:23:cc:ed:e9:24:4a:ec:65:56:ee:14:df:68:0f:96:9b:89:4d
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): c8:8a:75:46:ad:d3:c8:41:d0:2b:05:98:f9:1f:21:34:d0:41:4f:f9
Fingerprint (sha256): 84:d1:8a:08:e6:f7:6f:8d:22:7a:0c:65:b5:9b:38:db:2a:6d:2b:bc:06:38:47:17:8c:a9:86:cd:a1:09:64: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 hfdco.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for hfdco.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

hfdco.com

Other certificates including the domain name hfdco.com

(limited to 100 certificates)
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www.wahpetondentist.com
www.hfdco.com
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www.hfdco.com
www.trainenquiries.com
shielded-military-cases.com
www.hfdco.com
mesotherapygun.com
hfdco.com
hfdco.com
www.cellculturedfoods.com
www.ceceestrada.com
04716.com
www.hfdco.com

Certificate

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

Certificate (PEM)

-----BEGIN CERTIFICATE-----
MIIGSTCCBTGgAwIBAgISA6zA1IQW9xKV498qtbcKwXVVMA0GCSqGSIb3DQEBCwUA
MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD
ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0yMDAxMDkxMjM3NTZaFw0y
MDA0MDgxMjM3NTZaMBQxEjAQBgNVBAMTCWhmZGNvLmNvbTCCAiIwDQYJKoZIhvcN
AQEBBQADggIPADCCAgoCggIBAK2UBWncUd8qVfRXINP/StPItHd2Sj+FYl2H22FZ
+3dt5eMOAILvtIDTXPhbGVoI53SDmIuLprqIHt8zj09A910KjGfQcBnWaSUbFPQm
asfDba1saz0IFXJf6oODlOBubplasusHHohWgd4JsRlYaNFyZU6gxLsz/Xd0Lyz+
tCGqwCNiYssDbn8vmQbi5yKo3BFW/eR6y4rWJP90AKcu/k8T231/FLg7jFgGy3N9
8LFkuASjxnsTIhF4h3QBoblCi6L642eO+OLoOAVeKcx5TytP6yu+UiWe2ACq85JL
Eqb1xgxUvtbD+Db5y4G/fRbWLFTlhm4UVFNtIje6+fxpHGYrHB6/gCWwaUr/eiis
0/jBS5RaDyrXVlt0lGa/hxKcIOt593E3Kj5ff9FZVOy4J8OSPrdvtU0ph8QntC6z
l62EUMKejeCvWHgkupdY2f6oXjFOTiOFDXbeY+pyTkJ8ziEVKgN+aGx566fmOcQb
MT4RHfqjk1DpCshYuylYZIwVfdyW/sfQAfNnl1o7LFvxkxbzpl5crdX2YJyNjMRC
ReD/JOufSVhfMrRfYwlLprXcIjB6k26UtdkSKp2FavfIk6bRM/HF4swhLc3pTtJR
aQIPerq+aJBuZ7P0uDzndD5bb91SCdJlNifuO4hXar+3ctfUchM2N7+dz//vDwVJ
HtvPAgMBAAGjggJdMIICWTAOBgNVHQ8BAf8EBAMCBaAwHQYDVR0lBBYwFAYIKwYB
BQUHAwEGCCsGAQUFBwMCMAwGA1UdEwEB/wQCMAAwHQYDVR0OBBYEFHRjI8zt6SRK
7GVW7hTfaA+Wm4lNMB8GA1UdIwQYMBaAFKhKamMEfd265tE5t6ZFZe/zqOyhMG8G
CCsGAQUFBwEBBGMwYTAuBggrBgEFBQcwAYYiaHR0cDovL29jc3AuaW50LXgzLmxl
dHNlbmNyeXB0Lm9yZzAvBggrBgEFBQcwAoYjaHR0cDovL2NlcnQuaW50LXgzLmxl
dHNlbmNyeXB0Lm9yZy8wFAYDVR0RBA0wC4IJaGZkY28uY29tMEwGA1UdIARFMEMw
CAYGZ4EMAQIBMDcGCysGAQQBgt8TAQEBMCgwJgYIKwYBBQUHAgEWGmh0dHA6Ly9j
cHMubGV0c2VuY3J5cHQub3JnMIIBAwYKKwYBBAHWeQIEAgSB9ASB8QDvAHYAXqdz
+d9WwOe1Nkh90EngMnqRmgyEoRIShBh1loFxRVgAAAFvioah9AAABAMARzBFAiAt
Gx2i+aaxlKHViLEQWuI7rorGYXd8SBERv2Vd7pbySQIhAIbAeT2Ll1o42HjNgiOX
M08buK3S3B77L41uPZECl7TzAHUAsh4FzIuizYogTodm+Su5iiUgZ2va+nDnsklT
Le+LkF4AAAFvioaiEQAABAMARjBEAiAVyBk5smWoYPEgMnCvNSAJDv+TIjm5TlDI
cAsLGd9wEQIgQrPLzKUsjqnUIEG/7Xthj3R1xnza8+IMji0+x7jENywwDQYJKoZI
hvcNAQELBQADggEBAD+DVevpnmgQnSn71ReUYa8/I/+hzi0SkefrAbw0nrLomXpQ
vrF0EhowQjL0RRf/EEUkq2XhTbEPS8sHvEVdSc8Q1yQSJwlUIM4Uxx9oM63lRYaG
JVCcJLJwzflrspVCHHfB6uBaQUy3zdC42t0VDMBkCzbcwsh6EmdDq1clOMmkPY9T
zxXT0VoWTUjXq6D9MP6TxoGBpdm6C/kt1MVcwI4Yqxv/cx4mOQlJyTYzog5LmxCE
Z1zEyoO93krRTEKZ/9UrHf8WBXf+XziHHh8jL8V/kDcuxHYbMGeKMxm83Q4VMZ4L
cHGnSmn4qTBOBuPPMz2zFLhAM3vriYEf36oaIWs=
-----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 320121740126904421409887944807579490809173
 . . . . . . . . [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 2020-01-09 12:37:56 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-04-08 12:37:56 +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 'hfdco.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 708137304988124081209706911393804573714426572925240770564981711636146187305091987871301253115291101029287629653815282488170263495264458543441264123695457342391138657999202602902439795179375017968479870678542067045162012878549468936044336987639049157440989017341214965785627428213929227138498576434764062289539346953066963807198914254109414210722825148502783463500234593589180174412567365489919870402760778682900043118364577419629849403542266479470303672822152356706507357962470844686098211520077895149150925693269660152126175159929068998662708173687950393080450562696140469763630696810090353963043235632322485459561228463414768560627892159555400092464178101895968997208885832108583510845606360148785311915347445783626625755845229181830179623742903770935679531146140785741932713086994777417465181725570672174906761315494386494067003652442319910220676952226937247237144820797767360396263447960394609758901956221726623378651826281308799103529180385529752798655483308390966231681762597421919907353815320212487524005298826623234123989407584818517094949224021998549360322020089605945224907142651009792141825757803703608782444882830021479254242870382408402910919416321646222466596191488019541930939055060141052216443533787799920894860516303
 . . . . . . . . . . . . . . . . . . . . [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)
							746323ccede9244aec6556ee14df680f969b894d
 . . . . . . . . . . . . . . . . [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 'hfdco.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)
							00ef0076005ea773f9df56c0e7b536487dd049e0327a919a0c84a1121284187596817145580000016f8a86a1f4000004030047304502202d1b1da2f9a6b194a1d588b1105ae23bae8ac661777c481111bf655dee96f24902210086c0793d8b975a38d878cd822397334f1bb8add2dc1efb2f8d6e3d910297b4f3007500b21e05cc8ba2cd8a204e8766f92bb98a2520676bdafa70e7b249532def8b905e0000016f8a86a2110000040300463044022015c81939b265a860f1203270af3520090eff932239b94e50c8700b0b19df7011022042b3cbcca52c8ea9d42041bfed7b618f7475c67cdaf3e20c8e2d3ec7b8c4372c
 . . . . [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)
		003f8355ebe99e68109d29fbd5179461af3f23ffa1ce2d1291e7eb01bc349eb2e8997a50beb174121a304232f44517ff104524ab65e14db10f4bcb07bc455d49cf10d7241227095420ce14c71f6833ade545868625509c24b270cdf96bb295421c77c1eae05a414cb7cdd0b8dadd150cc0640b36dcc2c87a126743ab572538c9a43d8f53cf15d3d15a164d48d7aba0fd30fe93c68181a5d9ba0bf92dd4c55cc08e18ab1bff731e26390949c93633a20e4b9b1084675cc4ca83bdde4ad14c4299ffd52b1dff160577fe5f38871e1f232fc57f90372ec4761b30678a3319bcdd0e15319e0b7071a74a69f8a9304e06e3cf333db314b840337beb89811fdfaa1a216b