netgiverapp.com
Issued by R3
About this certificate
This digital certificate with serial number 03:d8:99:95:c5:f7:41:a9:61:fa:ee:0c:e3:8a:97:9d:7f:2d 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=netgiverapp.com
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:d8:99:95:c5:f7:41:a9:61:fa:ee:0c:e3:8a:97:9d:7f:2dSerial Number (int): 335041998601014831223034202634095471460141
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: c2:c6:20:50:12:7f:72:a7:ea:50:aa:4e:ce:bd:28:ec:c2:a9:fc:2b
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6
Fingerprint (sha1): 35:98:db:f5:97:d7:0c:bb:a2:3e:80:66:b0:c3:f0:47:37:e2:eb:59
Fingerprint (sha256): 27:4a:d6:a4:66:47:3c:65:bf:de:c2:ae:18:c0:a5:d7:73:39:0a:96:a4:63:cd:b9:d8:03:85:12:92:13:fd:96
Issuing Certificate URL: http://r3.i.lencr.org/
Revocation information
OCSP Server: http://r3.o.lencr.orgCheck the revocation status for certificate netgiverapp.com
1
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for netgiverapp.com
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
netgiverapp.com
Other certificates including the domain name netgiverapp.com
(limited to 100 certificates)
netgiverapp.com
shwekyeerestaurant.com
www.miestokate.org
cdn.superweb.vn
www.decoright.biz
www.flugy.com
admin.kpboard.com
netgiverapp.com
www.shtanko.dev
netgiverapp.com
www.6benches.in
smartonesec.com
netgiverapp.com
netgiverapp.com
backoffice-dev.talent-alpha.com
netgiverapp.com
www.netgiverapp.com
driver.codedmile.com
netgiverapp.com
donate.netgiverapp.com
netgiverapp.com
netgiverapp.com
www.andrecarlosimoveis.com.br
shaofood.com
netgiverapp.com
www.hosonokotaro.jp
netgiverapp.com
netgiverapp.com
driver.codedmile.com
www.wonm.co.uk
gboxurca.turnosweb.app
mapper.7hourdev.com
www.netgiverapp.com
www.netgiverapp.com
cms.amazingdesign.eu
www.netgiverapp.com
netgiverapp.com
www.bocs.work
www.flugy.com
dashboard-uat.netgiverapp.com
netgiverapp.com
www.wonm.co.uk
netgiverapp.com
dashboard-staging.netgiverapp.com
app.messbechern.de
netgiverapp.com
www.6benches.in
www.netgiverapp.com
ng-stuttgart.de
inino.com.au
netgiverapp.com
blog.ideodora.info
nordea.keyexperience.se
www.netgiverapp.com
startup-seeders.com
www.giosaia.com
gifty.sale
q2-nps.dpd.co.uk
netgiverapp.com
app.netgiverapp.com
en.eurovision.app
wvz.modenu.com
shwekyeerestaurant.com
www.miestokate.org
cdn.superweb.vn
www.decoright.biz
www.flugy.com
admin.kpboard.com
netgiverapp.com
www.shtanko.dev
netgiverapp.com
www.6benches.in
smartonesec.com
netgiverapp.com
netgiverapp.com
backoffice-dev.talent-alpha.com
netgiverapp.com
www.netgiverapp.com
driver.codedmile.com
netgiverapp.com
donate.netgiverapp.com
netgiverapp.com
netgiverapp.com
www.andrecarlosimoveis.com.br
shaofood.com
netgiverapp.com
www.hosonokotaro.jp
netgiverapp.com
netgiverapp.com
driver.codedmile.com
www.wonm.co.uk
gboxurca.turnosweb.app
mapper.7hourdev.com
www.netgiverapp.com
www.netgiverapp.com
cms.amazingdesign.eu
www.netgiverapp.com
netgiverapp.com
www.bocs.work
www.flugy.com
dashboard-uat.netgiverapp.com
netgiverapp.com
www.wonm.co.uk
netgiverapp.com
dashboard-staging.netgiverapp.com
app.messbechern.de
netgiverapp.com
www.6benches.in
www.netgiverapp.com
ng-stuttgart.de
inino.com.au
netgiverapp.com
blog.ideodora.info
nordea.keyexperience.se
www.netgiverapp.com
startup-seeders.com
www.giosaia.com
gifty.sale
q2-nps.dpd.co.uk
netgiverapp.com
app.netgiverapp.com
en.eurovision.app
wvz.modenu.com
Certificate
The complete raw certificate details for netgiverapp.com in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIFJDCCBAygAwIBAgISA9iZlcX3Qalh+u4M44qXnX8tMA0GCSqGSIb3DQEBCwUA MDIxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQswCQYDVQQD EwJSMzAeFw0yMzAzMTUyMTE2NTNaFw0yMzA2MTMyMTE2NTJaMBoxGDAWBgNVBAMT D25ldGdpdmVyYXBwLmNvbTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEB AK4NmgRiQdL5ePg3m9vzigM0pz+e6xYLr0ReSSPas2Q8EKNhZffsL3U8jo2dUKbP yIHPOYhzHRIez1QZFZIbTBSITuAoAy6uzGzqUKt4ZfvEQ2nqqD9zU/Wxbk3ONZae tBksSSTb1uvb9UzLfqYS3KQVjEUBXxI9V/ibL2KxcXwo7fxxfBmD4UtRLnkhbUFv dr+wMvKVdQextdBqcobJ8aveRv+hjDf/35QsauibYZMR4zGFqvn91rw+NP3RYwlE eZ4d8mPOA4sMzKI6+o2e0w/O8PcEMpwpv/tK5f4m0/EyZkG46ZZ6F7gsjHO6uHxk 6azVvkVhyeSamb8M8wRPI/0CAwEAAaOCAkowggJGMA4GA1UdDwEB/wQEAwIFoDAd BgNVHSUEFjAUBggrBgEFBQcDAQYIKwYBBQUHAwIwDAYDVR0TAQH/BAIwADAdBgNV HQ4EFgQUwsYgUBJ/cqfqUKpOzr0o7MKp/CswHwYDVR0jBBgwFoAUFC6zF7dYVsuu UAlA5h+vnYsUwsYwVQYIKwYBBQUHAQEESTBHMCEGCCsGAQUFBzABhhVodHRwOi8v cjMuby5sZW5jci5vcmcwIgYIKwYBBQUHMAKGFmh0dHA6Ly9yMy5pLmxlbmNyLm9y Zy8wGgYDVR0RBBMwEYIPbmV0Z2l2ZXJhcHAuY29tMEwGA1UdIARFMEMwCAYGZ4EM AQIBMDcGCysGAQQBgt8TAQEBMCgwJgYIKwYBBQUHAgEWGmh0dHA6Ly9jcHMubGV0 c2VuY3J5cHQub3JnMIIBBAYKKwYBBAHWeQIEAgSB9QSB8gDwAHYAejKMVNi3LbYg 6jjgUh7phBZwMhOFTTvSK8E6V6NS61IAAAGG51j4awAABAMARzBFAiEA51hm/EfS LudVKZpu6T8mrU4u15JrTlQ2Sp1ezSvghqQCIF5DjCncHpEF3uilwVoOa2sF8dH8 Tovw4olHX+vpBgiKAHYA6D7Q2j71BjUy51covIlryQPTy9ERa+zraeF3fW0GvW4A AAGG51j4TQAABAMARzBFAiBw9yKFuOtF0n8/wyVO27f6ey0rtK5PD3ctyCd6zh5E 8AIhAMvEnRygwPUrVqSUBKP9FaSkx4q9mp5rRoExex3bYq/KMA0GCSqGSIb3DQEB CwUAA4IBAQCBdnuz4SiALZ0RXstSqJxrNvj434kFWHAO3htVOQZbFcWZLfUAHK6B ZvkGTfAx4aDW1QIQy/BC1s5mzUCJMW4DAOgv/0f9P3xCIjCiSZorIHu2zwD8MCVw 6VS9rzuUnf2cT5vI0+cr5UGQ3TLBovm0qRBj31X/rKTaKXz2N1Y1s9HjzL5gVEqy /UG8smm41A9UyAzaQ5wt7awzflt/VU0UJg1j4Oki+p+557yog4GEvvCrRq9p9YD0 17Ced53GpHXm8YlR4MH0wvbwKa1HjxuGtsayQBJddBoaAtTVSRDZBNnRqG+Bfpge S9Wdh2WbmTuRumFxJhoDYNfQNYMLFk9L -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEArg2aBGJB0vl4+Deb2/OK AzSnP57rFguvRF5JI9qzZDwQo2Fl9+wvdTyOjZ1Qps/Igc85iHMdEh7PVBkVkhtM FIhO4CgDLq7MbOpQq3hl+8RDaeqoP3NT9bFuTc41lp60GSxJJNvW69v1TMt+phLc pBWMRQFfEj1X+JsvYrFxfCjt/HF8GYPhS1EueSFtQW92v7Ay8pV1B7G10Gpyhsnx q95G/6GMN//flCxq6JthkxHjMYWq+f3WvD40/dFjCUR5nh3yY84DiwzMojr6jZ7T D87w9wQynCm/+0rl/ibT8TJmQbjplnoXuCyMc7q4fGTprNW+RWHJ5JqZvwzzBE8j /QIDAQAB -----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 335041998601014831223034202634095471460141 . . . . . . . . [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 2023-03-15 21:16:53 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-06-13 21:16:52 +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 'netgiverapp.com' . . . . . . . . [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 21972172277528534028536431415345209235256315181311374015242962586691432915028592033128127224043078422553908425014839103993002638959688174298151830655200223172362840767288215780716322953830383012427101244333089139158128494191316601889149726601239346749853859257025823883066551442903657122465485891546827463878539256776039589177488658381124256170164970835291581889691481869636049657211331517772225693145412287804446175173829643573185507181848645487458172337465463710218760767778693618700596174053584809756664024859926730079038934779399544738863910123201444014423189164386323830906043112434298640411836953840007554999293 . . . . . . . . . . . . . . . . . . . . [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) c2c62050127f72a7ea50aa4ecebd28ecc2a9fc2b . . . . . . . . . . . . . . . . [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 (19 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'netgiverapp.com' . . . . . . . . . . . . . . . . [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) 00f00076007a328c54d8b72db620ea38e0521ee98416703213854d3bd22bc13a57a352eb5200000186e758f86b0000040300473045022100e75866fc47d22ee755299a6ee93f26ad4e2ed7926b4e54364a9d5ecd2be086a402205e438c29dc1e9105dee8a5c15a0e6b6b05f1d1fc4e8bf0e289475febe906088a007600e83ed0da3ef5063532e75728bc896bc903d3cbd1116beceb69e1777d6d06bd6e00000186e758f84d0000040300473045022070f72285b8eb45d27f3fc3254edbb7fa7b2d2bb4ae4f0f772dc8277ace1e44f0022100cbc49d1ca0c0f52b56a49404a3fd15a4a4c78abd9a9e6b4681317b1ddb62afca . . . . [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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