mailserver.astro.rug.nl

Issued by R3

About this certificate

This digital certificate with serial number 04:f9:20:11:e5:3e:4d:98:28:d8:e6:c1:d2:6e:33:c4:b5:6a was issued on by Let's Encrypt.

With 6 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=mailserver.astro.rug.nl

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:f9:20:11:e5:3e:4d:98:28:d8:e6:c1:d2:6e:33:c4:b5:6a
Serial Number (int): 433222081304874335996372006951031190893930
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 32:f8:a7:44:b6:d5:be:45:be:40:51:c4:6f:39:a0:42:70:14:a6:a7
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 44:a8:36:7f:10:31:86:4a:0e:5f:ce:83:89:df:61:a3:a2:08:6e:51
Fingerprint (sha256): 0a:17:6c:3c:98:ae:8b:e1:39:61:4d:85:53:97:c4:e4:d7:ec:99:44:96:eb:b7:bb:4e:00:02:3a:7e:a3:ef:63

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

Revocation information

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

Check the revocation status for certificate mailserver.astro.rug.nl

6

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for mailserver.astro.rug.nl

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

astro.rug.nl
mailhost.astro.rug.nl
mailhost1.astro.rug.nl
mailhost2.astro.rug.nl
mailserver.astro.rug.nl
webmail.astro.rug.nl

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Certificate

The complete raw certificate details for mailserver.astro.rug.nl in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----
MIIFoTCCBImgAwIBAgISBPkgEeU+TZgo2ObB0m4zxLVqMA0GCSqGSIb3DQEBCwUA
MDIxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQswCQYDVQQD
EwJSMzAeFw0yMzAyMjAwNDAwMDlaFw0yMzA1MjEwNDAwMDhaMCIxIDAeBgNVBAMT
F21haWxzZXJ2ZXIuYXN0cm8ucnVnLm5sMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8A
MIIBCgKCAQEAs26Hw+Lkx1xw5uyL7QHjPCzoNBIAutlNdo8yh1n/z6s/utAcznSj
j5ZviTdRRHTabgugbWNVTuv5gMZPEUiu8JyGD1Vv5UcxrgVWE3HMcA24RpVvW9ik
ABpAsq1wX9qx7spOdwZW1wxX/jyI5VyJIFMqwsoqzeHOEfLdnMdLNNA9Xkq9XIXe
wYj1ekl6Em2k2q9Whd3fETYF+/wIpv1JGbRPhJA/1d5ZT0CNvyZzw9LLRoBHi4b1
Pd2yxJwomCY39BkpNtM9Qk7ISNeOa8QTDkCExIoPTn/dkNlXooIzq+Mx/BB1GLrm
19rd+EMHL/3y2LlaCZje37+2AqmlacLH2QIDAQABo4ICvzCCArswDgYDVR0PAQH/
BAQDAgWgMB0GA1UdJQQWMBQGCCsGAQUFBwMBBggrBgEFBQcDAjAMBgNVHRMBAf8E
AjAAMB0GA1UdDgQWBBQy+KdEttW+Rb5AUcRvOaBCcBSmpzAfBgNVHSMEGDAWgBQU
LrMXt1hWy65QCUDmH6+dixTCxjBVBggrBgEFBQcBAQRJMEcwIQYIKwYBBQUHMAGG
FWh0dHA6Ly9yMy5vLmxlbmNyLm9yZzAiBggrBgEFBQcwAoYWaHR0cDovL3IzLmku
bGVuY3Iub3JnLzCBjwYDVR0RBIGHMIGEggxhc3Ryby5ydWcubmyCFW1haWxob3N0
LmFzdHJvLnJ1Zy5ubIIWbWFpbGhvc3QxLmFzdHJvLnJ1Zy5ubIIWbWFpbGhvc3Qy
LmFzdHJvLnJ1Zy5ubIIXbWFpbHNlcnZlci5hc3Ryby5ydWcubmyCFHdlYm1haWwu
YXN0cm8ucnVnLm5sMEwGA1UdIARFMEMwCAYGZ4EMAQIBMDcGCysGAQQBgt8TAQEB
MCgwJgYIKwYBBQUHAgEWGmh0dHA6Ly9jcHMubGV0c2VuY3J5cHQub3JnMIIBAwYK
KwYBBAHWeQIEAgSB9ASB8QDvAHYAtz77JN+cTbp18jnFulj0bF38Qs96nzXEnh0J
gSXttJkAAAGGbTGPHgAABAMARzBFAiBO4bTaGwclkrHMAPc2HMCTUcguGK42TbBG
sELTImM/VgIhANGK4NA6RV0BrSR87iZIajHXH/7ayulEUvMO86ibX7BlAHUA6D7Q
2j71BjUy51covIlryQPTy9ERa+zraeF3fW0GvW4AAAGGbTGPFAAABAMARjBEAiAf
KHud5Dxc7wU3+tGgZzzZWF01E8bEIBbkDK1d/45PBgIgcOOeGV1w8JCuURLc/2ra
JMvUCV4pPONKm+Fdu8pe2xAwDQYJKoZIhvcNAQELBQADggEBAJ+ySW2UwTa+/e4k
AVQ5pMyBL/du4cO1jOyrFVtLW5yMXwaQyzdRALLIJU3TYV1ctv4Q5hm9hTU9vYG8
elTk5viQshVeAc0uMbD3Ny/UZSPx7OPh4ulQD0Ie4fkf00w/9Qtd5B5oULSJKY7y
tyuQJGqPtNFCEkDDv8RYQ5QIP7/2AcP07NtQ/XzoBrao5aJTd3/qASSYL65eZvEX
iRpa72UThYQTqQPO6KTQ7Y+9cJ5SZRRnyLdr/jCFkZ7+FztbSTQKPjDyaVzywVYx
6Cl4CcZhO0WcvQMfGcI6/2DrFKRLqSenAzS51q+6MG9OACp4BnnHWWwTk2YrY5Wi
rdcTm4Y=
-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAs26Hw+Lkx1xw5uyL7QHj
PCzoNBIAutlNdo8yh1n/z6s/utAcznSjj5ZviTdRRHTabgugbWNVTuv5gMZPEUiu
8JyGD1Vv5UcxrgVWE3HMcA24RpVvW9ikABpAsq1wX9qx7spOdwZW1wxX/jyI5VyJ
IFMqwsoqzeHOEfLdnMdLNNA9Xkq9XIXewYj1ekl6Em2k2q9Whd3fETYF+/wIpv1J
GbRPhJA/1d5ZT0CNvyZzw9LLRoBHi4b1Pd2yxJwomCY39BkpNtM9Qk7ISNeOa8QT
DkCExIoPTn/dkNlXooIzq+Mx/BB1GLrm19rd+EMHL/3y2LlaCZje37+2AqmlacLH
2QIDAQAB
-----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 433222081304874335996372006951031190893930
 . . . . . . . . [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 2023-02-20 04:00:09 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-05-21 04:00:08 +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 'mailserver.astro.rug.nl'
 . . . . . . . . [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 22651161127409463154717803106577457285599566404010646857349493600902448160996029303224867246332690131343293706491071506411774322730525818520872649724597187579797130761260750390354693995348704202251461704237233113332457398128857437187671564639408359055070380939016738644980738950583507533661586529249595099168094391387080960441704147830167833539033591339149930478390360747716735627958585979383930357470270491851680875163399123718209144787801956043974086219124169614884528578141569363367971884874739302882247678995200387790180678401572782337717165077595235342418820574396790572039849359779310405876081325446234529515481
 . . . . . . . . . . . . . . . . . . . . [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)
							32f8a744b6d5be45be4051c46f39a0427014a6a7
 . . . . . . . . . . . . . . . . [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 (135 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'astro.rug.nl'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mailhost.astro.rug.nl'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mailhost1.astro.rug.nl'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mailhost2.astro.rug.nl'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mailserver.astro.rug.nl'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webmail.astro.rug.nl'
 . . . . . . . . . . . . . . . . [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 (244 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes)
							00ef007600b73efb24df9c4dba75f239c5ba58f46c5dfc42cf7a9f35c49e1d098125edb499000001866d318f1e000004030047304502204ee1b4da1b072592b1cc00f7361cc09351c82e18ae364db046b042d322633f56022100d18ae0d03a455d01ad247cee26486a31d71ffedacae94452f30ef3a89b5fb065007500e83ed0da3ef5063532e75728bc896bc903d3cbd1116beceb69e1777d6d06bd6e000001866d318f14000004030046304402201f287b9de43c5cef0537fad1a0673cd9585d3513c6c42016e40cad5dff8e4f06022070e39e195d70f090ae5112dcff6ada24cbd4095e293ce34a9be15dbbca5edb10
 . . . . [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)
		009fb2496d94c136befdee24015439a4cc812ff76ee1c3b58cecab155b4b5b9c8c5f0690cb375100b2c8254dd3615d5cb6fe10e619bd85353dbd81bc7a54e4e6f890b2155e01cd2e31b0f7372fd46523f1ece3e1e2e9500f421ee1f91fd34c3ff50b5de41e6850b489298ef2b72b90246a8fb4d1421240c3bfc4584394083fbff601c3f4ecdb50fd7ce806b6a8e5a253777fea0124982fae5e66f117891a5aef6513858413a903cee8a4d0ed8fbd709e52651467c8b76bfe3085919efe173b5b49340a3e30f2695cf2c15631e8297809c6613b459cbd031f19c23aff60eb14a44ba927a70334b9d6afba306f4e002a780679c7596c1393662b6395a2add7139b86