arbitrage.gg

Issued by R3

About this certificate

This digital certificate with serial number 03:18:48:69:2b:ca:16:70:59:91:2b:d4:41:4b:7e:97:75:c4 was issued on by Let's Encrypt.

With 13 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:
  • DV certificate contains a subject common name, this is not recommended. If certificate policy 2.23.140.1.2.1 (CA/B BR domain validated) is included, only country and/or common name is allowed in SubjectDN. (BRs: 7.1.2.7.2)
  • Subscriber certificates use of Subject Key Identifier is NOT RECOMMENDED (BRs v2: 7.1.2.7.6)
  • Subscriber Certificate: commonName is NOT RECOMMENDED. (BRs: 7.1.2.7.1)

Certificate Subject

CN=arbitrage.gg

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:18:48:69:2b:ca:16:70:59:91:2b:d4:41:4b:7e:97:75:c4
Serial Number (int): 269599885096404569440522402837139876705732
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 73:52:1e:f8:d6:82:84:27:ad:d7:73:c3:1e:b7:e7:fb:5c:09:ad:0a
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): b0:e3:40:2d:81:99:3e:4a:36:29:15:bb:68:e3:62:35:08:1c:d6:c9
Fingerprint (sha256): 97:7c:af:b1:95:a4:e5:05:17:c3:52:a7:0e:f0:66:6f:60:9b:c2:48:6a:10:ea:ba:30:9c:dd:8c:a7:b3:2d:b7

Issuing Certificate URL: http://r3.i.lencr.org/

Revocation information

OCSP Server: http://r3.o.lencr.org

Check the revocation status for certificate arbitrage.gg

13

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for arbitrage.gg

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

arbitrage.gg
baltimoreabatherapy.com
bearshuttle.com
bhagawadgita.org
carrierchillers.com
forum80.com
homeschoolar.com
mepublic.statenationals.us.americasparentspromise.org
showlegal.com.smartrecharge.in
squarepegideas.net
tradingforvip.com
wiki.screamerfanbase.com
xignos.com.zur-bescherung.info

Other certificates including the domain name arbitrage.gg

(limited to 100 certificates)
arbitrage.gg
soundcloud.hacker.rehab
arbitrage.gg
ssl-yybay.epik.to
arbitrage.gg
arbitrage.gg
arbitrage.gg
arbitrage.gg
saxa.co.za
copy.vc
arbitrage.gg

Certificate

The complete raw certificate details for arbitrage.gg in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAqlj8SoaooIN6G7sc8/1W
Cv7G1mMLzVTn3UQ0ZJIsu/h2cMaLcOIuXZcNkWAYy3BQYt0bgBz7v8fpqCbIt0SP
Dy3vMscPbjMrJ+1lt+ZaG8vDSnocNhJz4Zueto+ym9eQdXZi9s0ww/Fw3QxEbhac
sIJTkgxhV2lTQLorZAdMIj6NDcq5mpPkYKqvI1I27wHABUfJyqsy15PUCYi/PZvs
7CJ8I155AntfBFQcXfDqIBPA+zwfZtclUUHFVCjAQPxHqqwNgWCKKvX5jIH5eEXb
QDgtMkDNUOWU72MAwrWrQsu+zI8f+4dR8m+fLkn7nNejLGdxe4aJPc9PxDSh7EoK
mQIDAQAB
-----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 269599885096404569440522402837139876705732
 . . . . . . . . [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 'R3'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-12-14 20:40:06 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-03-13 20:40:05 +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 'arbitrage.gg'
 . . . . . . . . [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 21504392235728871902895751446728820966063422088156362168176573239427421750063322207903040245140887592582069728374856074233916756595574472419274383169551015746852518934682460540016834897274623599233461187103629311803311290651582657805039344583017095616035585683004804020322383459562808266461283041007780560881969361956354750137776404495162632451214477674750776369933199761463813464414936078948016145934260480409139730750469386989732532197807541317992357425426575726033170278999963580876008713001939209521832297112381018330708470561090196799147101622949618945856553705274962865446469730822091612570259784660516141140633
 . . . . . . . . . . . . . . . . . . . . [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)
							73521ef8d6828427add773c31eb7e7fb5c09ad0a
 . . . . . . . . . . . . . . . . [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 142eb317b75856cbae500940e61faf9d8b14c2c6
 . . . . . . . . . . . . . . . . [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 (73 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://r3.o.lencr.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://r3.i.lencr.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 (314 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'arbitrage.gg'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'baltimoreabatherapy.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'bearshuttle.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'bhagawadgita.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'carrierchillers.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'forum80.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'homeschoolar.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mepublic.statenationals.us.americasparentspromise.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'showlegal.com.smartrecharge.in'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'squarepegideas.net'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'tradingforvip.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'wiki.screamerfanbase.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'xignos.com.zur-bescherung.info'
 . . . . . . . . . . . . . . . . [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 (12 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 1.3.6.1.4.1.11129.2.4.2
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f0007600eecdd064d5db1acec55cb79db4cd13a23287467cbcecdec351485946711fb59b0000018c6a45c4b200000403004730450220106284a1d5ee68948194bd21b302d819e4f9814c1961205898cca68d4877eeca022100d0f4f7cba572a9648dc7f4d080b7f58eb8bbc63a8f1c1d51dd3cfe719040649300760029d03a1bb674aa711cd3035b6557c14f8aa78b4fe8389449eca453f944bd24680000018c6a45c5640000040300473045022100b3628e2c4077060c8b606675dd3cb1d9c5e7951d0239a6885c9258dba6d7467f0220194069a7e85c155c9165de5e853237bac3f3272aadf597fd6db6a2a7209241a6
 . . . . [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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