DNS
THE CERTIFICATE BEHIND THE CONNECTION

TLS certificate checker.

Inspect SSL/TLS certificates for any public domain or subdomain.

Checks HTTPS on port 443, including subject alternative names, validity dates and the presented chain.

SSL certificate

TLSv1.3

mx.ziesel.network · 94.142.241.216:443

Verified

Certificate chain, hostname and dates verified using this server’s CA store.

Subject
CN=mx.ziesel.network
Issuer
C=US O=Let's Encrypt CN=YR2
Valid from
2026-10-14T16:27:01+00:00
Expires
2027-01-12T16:27:00+00:00
Days remaining
66
Serial (hex)
05F16CFEC782C6938063EF060277CACCB894
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:autoconfig.as205079.net, DNS:autoconfig.mziesel.nl, DNS:autoconfig.ziesel.network, DNS:autodiscover.as205079.net, DNS:autodiscover.mziesel.nl, DNS:autodiscover.ziesel.network, DNS:mta-sts.as205079.net, DNS:mta-sts.mziesel.nl, DNS:mta-sts.ziesel.network, DNS:mx.ziesel.network

SHA-256 fingerprint

4F:19:FE:89:03:37:0E:33:0C:1F:3C:1C:0E:25:BF:E7:ED:0E:69:69:16:6D:11:77:E4:EA:92:61:A9:72:2E:73
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
2E:69:41:24:70:68:0B:B3:9E:A6:D8:16:DC:9D:12:81:48:5B:6A:D3
authorityKeyIdentifier
40:15:2D:26:79:ED:32:20:9E:DF:9A:72:1D:D6:32:1F:81:0C:81:0C
authorityInfoAccess
CA Issuers - URI:http://yr2.i.lencr.org/
subjectAltName
DNS:autoconfig.as205079.net, DNS:autoconfig.mziesel.nl, DNS:autoconfig.ziesel.network, DNS:autodiscover.as205079.net, DNS:autodiscover.mziesel.nl, DNS:autodiscover.ziesel.network, DNS:mta-sts.as205079.net, DNS:mta-sts.mziesel.nl, DNS:mta-sts.ziesel.network, DNS:mx.ziesel.network
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr2.c.lencr.org/21.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 59:6E:6C:33:86:94:B2:59:72:A2:56:C8:A0:E8:DD:90: 4A:76:E8:08:3D:DA:87:3B:01:08:38:28:14:3C:EE:59 Timestamp : Oct 14 17:25:31.767 2026 GMT Extensions: 00:00:05:00:0D:49:F1:41 Signature : ecdsa-with-SHA256 30:44:02:20:23:0A:AB:9A:A2:4E:D0:DB:16:63:7A:10: AF:D0:73:E0:15:65:E3:83:6C:F9:D6:2B:11:E1:45:2E: D2:71:63:64:02:20:0B:56:14:6C:46:75:71:0F:9C:CF: 98:D4:ED:45:B1:02:E7:D1:96:C3:6C:70:99:A9:BF:23: F8:D4:BF:AE:39:B2 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 60:4C:9A:AF:7A:7F:77:5F:01:D4:06:FC:92:0D:C8:99: EB:0B:1C:7D:F8:C9:52:1B:FA:FA:17:77:3B:97:8B:C9 Timestamp : Oct 14 17:25:32.149 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:87:77:C4:D7:3E:A0:B2:2A:96:2D:21: 83:56:75:29:07:BF:10:3E:D8:8F:A9:59:6B:03:5C:32: E9:2B:72:0D:69:02:20:45:91:5E:4A:DA:3A:51:2F:3C: C1:22:0B:F0:B3:0A:30:6E:2B:74:4B:43:2C:CB:C6:6C: 1F:40:B1:E7:B1:A9:12
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-11-07T07:55:11+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=US O=Let's Encrypt CN=YR2
Issuer
C=US O=ISRG CN=Root YR
Valid from
2025-09-03T00:00:00+00:00
Expires
2028-09-02T23:59:59+00:00
Days remaining
665
Serial (hex)
4EBD24947E24D394802D84A52FD5B319
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

23:8B:85:A0:09:9C:65:B9:70:47:7D:57:24:F1:A1:D4:75:CE:50:58:CF:FE:4E:FA:87:33:89:9B:DB:86:3C:47
Certificate extensions & PEM
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
40:15:2D:26:79:ED:32:20:9E:DF:9A:72:1D:D6:32:1F:81:0C:81:0C
authorityKeyIdentifier
DE:E7:5B:60:D0:22:6D:40:28:7D:3F:0D:01:FE:A4:B5:52:B4:51:94
authorityInfoAccess
CA Issuers - URI:http://yr.i.lencr.org/
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr.c.lencr.org/ 
-----BEGIN CERTIFICATE-----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==
-----END CERTIFICATE-----

Chain certificate 2

Subject
C=US O=ISRG CN=Root YR
Issuer
C=US O=Internet Security Research Group CN=ISRG Root X1
Valid from
2026-05-13T00:00:00+00:00
Expires
2032-09-02T23:59:59+00:00
Days remaining
2126
Serial (hex)
F24B6D17F9D9AD7CB1C9FEA78782699F
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

07:26:39:D0:B1:40:D5:BF:FA:E1:6A:D9:C3:F6:CC:60:86:04:06:21:F5:1E:E6:1A:6D:46:A8:91:5C:07:CF:76
Certificate extensions & PEM
keyUsage
Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:TRUE
subjectKeyIdentifier
DE:E7:5B:60:D0:22:6D:40:28:7D:3F:0D:01:FE:A4:B5:52:B4:51:94
authorityKeyIdentifier
79:B4:59:E6:7B:B6:E5:E4:01:73:80:08:88:C8:1A:58:F6:E9:9B:6E
authorityInfoAccess
CA Issuers - URI:http://x1.i.lencr.org/
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://x1.c.lencr.org/ 
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

One endpoint on port 443. Server-presented chain; no revocation, OCSP, CT or full TLS security scan.

View certificate JSON

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