c3.progressnownm.org

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:7c:00:97:b3:23:7b:fe:a3:be:b2:c0:3e:6a:67:00:fd:bd 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=c3.progressnownm.org

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:7c:00:97:b3:23:7b:fe:a3:be:b2:c0:3e:6a:67:00:fd:bd
Serial Number (int): 303532658963665427406580021640996478582205
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 16:e5:f3:c8:74:3f:76:eb:27:75:f8:d9:f8:83:0d:dc:59:7a:10:3e
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): bb:5c:97:f6:78:36:89:fa:27:b3:5c:64:e0:8c:c2:db:a6:8e:e6:48
Fingerprint (sha256): e9:e5:49:6c:6c:e1:3c:7e:88:4d:50:ce:82:d6:ba:f4:01:6f:b7:1a:dc:f8:65:37:bc:6b:94:59:53:01:72:31

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 c3.progressnownm.org

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for c3.progressnownm.org

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

c3.progressnownm.org

Other certificates including the domain name progressnownm.org

(limited to 100 certificates)
act.one.org
c3.progressnownm.org
c3.progressnownm.org
act.progressiowa.org
act.boldprogressives.org
www-default.actionkit.com
progressnownm.org
tls.automattic.com
action.314actionfund.org
progressnownm.org
act.medicare4all.org
act.ilhanomar.com
act.johnfetterman.com
act.weareultraviolet.org
act.progressnownm.org
peoplesmillion.whitehelmets.org
act.electdemsnow.org
act.colorofchange.org
progressnownm.org
www-default.actionkit.com
act.lucaskunce.com
www-default.actionkit.com
c3.progressnownm.org
progressnownm.org
act.elizabethwarren.com
action.pollinis.org
progressnownm.org
act.jamieraskin.com
c3.progressnownm.org
www-default.actionkit.com
progressnownm.org
act.one.org
c3.progressnownm.org
progressnownm.org
progressnownm.org
act.progressnc.org
www-default.actionkit.com
progressnownm.org
tls.automattic.com
www-default.actionkit.com
progressnownm.org
secretmessageforwhatsapp.com
act.pirg.org
act.abwt.org
tls.automattic.com
act.progressga.org
act.ruraldemocratsturnoutfund.com
act.defendvotingrights.org
progressnownm.org
www-default.actionkit.com
www-default.actionkit.com
progressnownm.org
admin.jounco.com
act.ourrevolution.com
act.democratic-strategy.org
progressnownm.org
act.cutcruz.com
act.beaherofund.com
progressnownm.org
act.hillharper.com
act.ourrevolution.com
tls.automattic.com
progressnownm.org
c3.progressnownm.org
bento.dataauchan.fr
act.cbcpac.org
act.leaderswedeserve.com
act.betoorourke.com
c3.progressnownm.org
c3.progressnownm.org
www-default.actionkit.com
progressnownm.org
c3.progressnownm.org
progressnownm.org
act.jamieraskin.com
progressnownm.org
act.ourrevolution.com
www-default.actionkit.com
tls.automattic.com
act.whitehelmets.org
c3.progressnownm.org
act.occupydemocrats.com
www.nowarwithiran.org
c3.progressnownm.org
www-default.actionkit.com

Certificate

The complete raw certificate details for c3.progressnownm.org in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA3W5LeF5b/p+TSCP5hVER
PIc4wsVZFhUPHjnmQ2v3xTNM5qU5jp5fjTsYSUaBCC27dzZgQ2tcl8Jx5hOR9OH4
DwWmNILOqJ4PtFQ1FW/NZEVv7k9y5vPzZ+Sgvd/j4iXizfKfEtrD4sdt76pt0lAl
shIhOBwPgxtbS4HgQPbq12j81kIXEVwxrPEe2DYQHM+wHZ5Xw2LOA3h/o2uate7o
tLKRFaM0AwsbTjOAXUcTyB2OMH6Y5V0tlBo75a/6WbAHW1k/pdTKj/qJ5/aokGEm
+FtMrnzCmtateK4r7dZZQzIMEEP5Hiyq9n5Mw8ijYDEkklKf+tgVL2gHF+rkzzpN
SwIDAQAB
-----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 303532658963665427406580021640996478582205
 . . . . . . . . [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 2019-06-21 17:43:07 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-09-19 17:43:07 +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 'c3.progressnownm.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 (2160 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 27953053793139233019192927297692709665218489818860427890033122328095921326980008883460878038193933589009673010515570526614376382838009795216493693504273986245150510031464487755157710935964824713361472481260017699949130715003545873078441724526430741405990962262348853640369250122747323152981544975175324514562067136844676583694459784638062681601936826372333553344555614625835948442417887824657173014723251084351102189761530546570024749136751618071847630742091774942961823364433415192392296920281724388673852564268739206364714323186518324014112313590964891715801811937770680128127825182119240947315856573098996960742731
 . . . . . . . . . . . . . . . . . . . . [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)
							16e5f3c8743f76eb2775f8d9f8830ddc597a103e
 . . . . . . . . . . . . . . . . [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 (24 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'c3.progressnownm.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 (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f0007600e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe0000016b7b596f480000040300473045022100a9b4f8cfe5a073be1bf1ecaecfeb25405cb3983af168fe6e47cde6216fe88dce022045195fc1c937b8d1542131606d9050f210a6154ba735304c7e080978f5b408b600760063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d0000016b7b596f6c00000403004730450220268d609d96be937108ab3e6115411c76dfed2235e2fade57169cd59affa9b35c022100d5cd10c6eb3dc85b043c053b64ddbf65f5dca55fa78cfdc3b6f1c446ef7cf16e
 . . . . [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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