cdn.kirichilli.tw

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:cb:1d:cc:67:32:a3:a6:de:83:77:c4:ad:0c:83:08:4f:ad 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=cdn.kirichilli.tw

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:cb:1d:cc:67:32:a3:a6:de:83:77:c4:ad:0c:83:08:4f:ad
Serial Number (int): 417566073145528643425623792649440493850541
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 07:3e:29:05:68:70:f7:41:92:39:7f:43:e7:78:d4:fa:78:16:58:f8
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 36:7a:46:12:20:2f:dd:aa:6e:a4:69:50:dc:57:e0:6f:64:f7:8a:75
Fingerprint (sha256): d9:56:a9:42:84:03:07:40:d9:ee:2f:04:b7:e8:87:1f:f7:2b:df:fd:d3:99:31:0a:b2:8d:69:02:98:e6:b6:df

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 cdn.kirichilli.tw

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for cdn.kirichilli.tw

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

cdn.kirichilli.tw

Other certificates including the domain name kirichilli.tw

(limited to 100 certificates)
cityx.agency
www.donesky.io
cdn.kirichilli.tw
admin.kirichilli.tw
betbro.app
jlincolndennis.com
www.rickg.me
apexcel.ae
staging.p3a.app
bealtaine.band
thelastcall.cl
ajbtreecare.co.uk
admin.kirichilli.tw
driversqope.com
cdn.kirichilli.tw
cdn.kirichilli.tw
dearcollege.co
g.stext.id
www.manicoulegal.com
cdn.kirichilli.tw
betbro.app
www.dr-ach.com
cocobuk.com
microservice.idmelon.com
tanos.ai
www.littleapi.com
cdn.kirichilli.tw
tmapuam.com
www.kirichilli.tw
dhanrajsp.me
kirichilli.tw
obliging.xyz
www.cominiti.com
smestadkollen.com
cdn.kirichilli.tw
www.stormswaps.com
www.barceloarquitectos.com
thatch.sandbox.chatnat.ai
cdn.kirichilli.tw
kirichilli.tw
gardenspruce.com
getmycue.info
cdn.kirichilli.tw
sumzero.spooky.company
admin.kirichilli.tw
dna.darthvid.com
www.b2t.net.br
www.faptwo.com
www.pedsqbank.com
sjbeautique.co.uk
darbyshire.nz
www.pedsqbank.com
pt.playiely.com
360questions.com
cdn.kirichilli.tw
admin.kirichilli.tw
foods.nikek.se
www.appreci8.io
diary.ilmsg.in.th
fantasyfootballmanager.app
www.bdcityhelper.com
cdn.kirichilli.tw
admin.kirichilli.tw
staging.kirichilli.tw
www.fou.sh
www.roundtablestudio.org
unavemarundhu.in
jlincolndennis.com
app.sampledecks.com
app.tradstr.com
cdn.kirichilli.tw
www.allisondm.me
link.frogomeli.net
admin.kirichilli.tw
dietlicious.ae
admin.kirichilli.tw
admin.kirichilli.tw
www.assunivasf.com.br
jlink.it
www.soteam.app
passman.ndiw.online
www.siuv.ch
usefiona.com
dance-events.quebec
helgoboss.jampad.app
calchat.app
microservice.idmelon.com
cdn.kirichilli.tw

Certificate

The complete raw certificate details for cdn.kirichilli.tw in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtKi49yV/sAp1B+FccZz/
joo0EO+kLzWNB6qcWnL5Tg4BjFrneiPt6DIGOGr4mzDhp+T7lrQc0SThJ4+IwmCW
Pxp2pKI9N7eptDb8wRLIG3VuQ3l5Y+CXPWZI8iTuM03LhX3RkyXsvCYKpBdOSQBU
NyE6vkiTnaAygQFdb4GJh++GtfVsV0g3VcGjpEsiHMgbBLtxFo0gWThBE/++SLYS
icf+MhJZfb1K8GJVMyPOGGqteCwK16y/jYks16V/Jg4BnSrWkL1WIVtYcHkLNYHG
ljoGzYH8AcCipwSDGl28DYSezX41O1e/yfOZm42AY6bHEZ45OianJSIzYNIv9783
wQIDAQAB
-----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 417566073145528643425623792649440493850541
 . . . . . . . . [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 2018-11-20 11:36:51 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-02-18 11:36:51 +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 'cdn.kirichilli.tw'
 . . . . . . . . [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 22806095069985604322360387844933333203890991401259376673902744337183072633347429263153845944608898586768724047770641680813023750064175197882880263656431883784038143307971493663603207309874760494197216862332721900838000201960816192445929515548012422371901736003366832770384115379215787453590675033785315290113588451624918706840990647716152478288652474810615974146281239678295534388532233986739812447670758030219538333161172569326915932354739357039820548792294676139214776229972638991979787221746763268711021736750152023730445918393378591304407975996802444014327303279381780391288656017022955274681657340812779725993921
 . . . . . . . . . . . . . . . . . . . . [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)
							073e29056870f74192397f43e778d4fa781658f8
 . . . . . . . . . . . . . . . . [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 (21 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'cdn.kirichilli.tw'
 . . . . . . . . . . . . . . . . [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)
							00f0007600e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe00000167311f914b0000040300473045022009fc1d2c8b4819e3e232d2e4d99a40deec561b246bf72998636ff92462894ca60221009404207475b7312fe3bddc11f5c801080f17305dcb1ecfd312aba45e6cf7d8c000760063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d00000167311f91430000040300473045022100edca2d361d554f5a0a248595d66cfbf9f3fdb823902c0eb841e8ab6e6cdace25022061d68bc5d66949d6726b7316e6b17abc2ec1110033b9674b4f529f19df2555b3
 . . . . [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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