f3.org

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:c7:f9:78:ca:17:45:d8:07:fb:0c:34:97:37:0c:7c:dc:47 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=f3.org

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:c7:f9:78:ca:17:45:d8:07:fb:0c:34:97:37:0c:7c:dc:47
Serial Number (int): 329384653758011565707559509612407736294471
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: e1:21:3f:fa:4b:02:69:51:db:d8:b2:e8:4b:ee:be:5b:7d:39:d4:65
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 40:97:6c:40:48:a0:5d:79:9d:9b:89:d1:fb:4a:aa:b2:d8:6f:b7:c1
Fingerprint (sha256): a5:98:a8:dc:21:b7:f4:63:78:c9:df:96:61:33:bb:06:f2:ff:e5:cc:43:b2:32:47:5b:a3:7a:31:5a:7c:50:40

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 f3.org

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for f3.org

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

f3.org

Other certificates including the domain name f3.org

(limited to 100 certificates)
f3.org
www.f3.org
www.f3.org
www.f3.org
653.me
f3.org
f3.org
f3.org
f3.org
www.f3.org
www.f3.org
f3.org
f3.org
f3.org
f3.org
petfood.organic
blockchainbrains.ca
f3.org

Certificate

The complete raw certificate details for f3.org in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----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-----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 329384653758011565707559509612407736294471
 . . . . . . . . [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 2019-12-09 12:54:31 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-03-08 12:54:31 +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 'f3.org'
 . . . . . . . . [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 802456224232983794857054095142099928485838315344317227217212357647277603928389395407935240690862740885256929989700731102979214562058253433557507919751539666965653104729719285032865813033705968494035736955755274011816636986994684816480663571236910129290218454096495391360686036284090818804288165945261701963917814631767327503670802974301690701800478186525121170735138146163323462739198901313770373639599102415068755730610708748145734494845622357907662838557580695097125245743708944757783379786310905734613201656664707887732301557747189727775276471411723508178287643121649165109385622793780233537486522627660480884541648730325522828180093966740181184520083466104319561690143522291828393695322011362622445984864927391808710253245117981147120129915699808979897132338460407649340347402582668953694742981470657319763949178351364289235176476672688714680809120032566388476518336350716178110048454134742241262757004173167160357364130522372174510381661689521864354454841394674560446826924054114033844527019631835220259430154371938163883898761264071345965290164296955105890383555750710779141277459743620585874716024639140133112321471351587081888270076318069495616221935302210161570647854229075432155465571384685122877135545669254704922751957089
 . . . . . . . . . . . . . . . . . . . . [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)
							e1213ffa4b026951dbd8b2e84beebe5b7d39d465
 . . . . . . . . . . . . . . . . [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 (10 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'f3.org'
 . . . . . . . . . . . . . . . . [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)
							00f10077006f5376ac31f03119d89900a45115ff77151c11d902c10029068db2089a37d9130000016eeaf0aabf0000040300483046022100ea4401dd877baa32e2500145d50a11dcc4bb67780eaa7adde01a100ca10ee42c022100ec1304e70841b57d2a8243ad93befc6dc5bfa6d44fdf17b825ae471a73d9189d007600b21e05cc8ba2cd8a204e8766f92bb98a2520676bdafa70e7b249532def8b905e0000016eeaf0aca70000040300473045022006595e4a562dcc4e7446e8e24e93880564228016632f2be9f39f5cdfe00bcdd5022100a258aaf05e9f798f9ec777ff474c0db1b430154b86fa7ae7c3f1b287c6d06766
 . . . . [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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