fizi.co.il

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:fa:24:db:44:51:0a:a4:a6:13:9d:11:98:6e:ac:b0:9f:1d was issued on by Let's Encrypt.

With 3 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=fizi.co.il

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:fa:24:db:44:51:0a:a4:a6:13:9d:11:98:6e:ac:b0:9f:1d
Serial Number (int): 346456440232000260014566808310469534719773
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 10:83:17:21:98:4b:dd:10:0e:b3:9a:81:6e:44:03:33:c2:25:bd:fe
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): b2:30:dc:68:83:4e:53:f9:e1:50:cc:77:23:46:a7:01:f7:aa:16:53
Fingerprint (sha256): 2a:f8:ce:2a:af:e2:82:00:37:cf:02:79:6a:b0:81:f5:09:c1:e2:b6:ad:40:c2:92:2b:e8:b6:00:e5:0b:fc:b7

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 fizi.co.il

3

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for fizi.co.il

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

8 extensions
No unhandled critical extensions

CA Certificate

This is not a CA certificate

Subject Alternative Names

edu.fizi.co.il
fizi.co.il
www.fizi.co.il

Other certificates including the domain name fizi.co.il

(limited to 100 certificates)
fizi.co.il
*.fizi.co.il
*.fizi.co.il
*.fizi.co.il
*.fizi.co.il
fizi.co.il
*.fizi.co.il
fizi.co.il
*.fizi.co.il
*.fizi.co.il
fizi.co.il
*.fizi.co.il
*.fizi.co.il
fizi.co.il
*.fizi.co.il

Certificate

The complete raw certificate details for fizi.co.il 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 346456440232000260014566808310469534719773
 . . . . . . . . [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 2017-06-22 20:13:00 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2017-09-20 20:13:00 +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 'fizi.co.il'
 . . . . . . . . [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 791902610281510987518767343631577852250948939442400732796767689745710195113419893451856324539358039717743854701343037917020523941843394280270944343420751745206208996506988766544305823055555695347776731976421890040710418760174759202195379168420539241839560775030278719518334485469141389849130465244629494573109946313709752330751499547866099534309949216621373394545074484494354307540064291214077338880973155458023806283104743655344397068578108836571384704552638552642797222823431336872187438405049839184180986404506768585233266534592206389818635428008154964220060656736001114223786456509636264374760188890791823079401903848755436860511324134012216727456383606497041099436376689621878454547830131252116858231771225634138650671668411573452674954951656764612014493621094870278549953576274647770004933430578940809382550638449354624768373817848994557790712224839124651797366486469404584107147504846019841772800334678246255521341514239476224158596721906708721872935508522215868231950841060622037586927432926601369175951901750664377809858300037115142644171072368218317558780154237347341205249898028140228524926386848871527446317502769214773302638612364672357752374802463422931044140314185568440021342498571694136252665209544521592258404212363
 . . . . . . . . . . . . . . . . . . . . [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)
							10831721984bdd100eb39a816e440333c225bdfe
 . . . . . . . . . . . . . . . . [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 (46 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'edu.fizi.co.il'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'fizi.co.il'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.fizi.co.il'
 . . . . . . . . . . . . . . . . [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 (246 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 1.3.6.1.5.5.7.2.2 (unotice)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:12|false] UTF8String 'This Certificate may only be relied upon by Relying Parties and only in accordance with the Certificate Policy found at https://letsencrypt.org/repository/'
 . . . . [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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