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

TLSv1.2

mail.cldn.eu · 185.205.137.10:443

Verified

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

Subject
CN=cldn.eu
Issuer
C=US O=Let's Encrypt CN=YR1
Valid from
2026-10-18T17:03:02+00:00
Expires
2027-01-16T17:03:01+00:00
Days remaining
89
Serial (hex)
05EE27EFDDFB85807321B2D4184168563726
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:cldn.eu, DNS:imap.cldn.eu, DNS:mail.cldn.eu, DNS:smtp.cldn.eu, DNS:www.cldn.eu

SHA-256 fingerprint

63:44:52:65:E3:67:78:D3:E3:1E:A7:82:A7:59:1D:AD:8A:D4:49:B3:66:0D:89:81:1A:56:43:86:CA:DB:07:AB
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
47:D1:2A:D0:6F:6A:92:34:03:63:00:3A:3E:6E:09:F3:15:99:C8:0E
authorityKeyIdentifier
1F:2F:35:BE:46:14:82:CD:40:B1:AE:79:2C:55:78:FA:F7:D4:68:FB
authorityInfoAccess
CA Issuers - URI:http://yr1.i.lencr.org/
subjectAltName
DNS:cldn.eu, DNS:imap.cldn.eu, DNS:mail.cldn.eu, DNS:smtp.cldn.eu, DNS:www.cldn.eu
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr1.c.lencr.org/39.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 1C:9F:68:2C:E9:FA:F0:45:69:50:F8:1B:96:8A:87:DD: DB:32:10:D8:4C:E6:C8:B2:E3:82:52:4A:C4:CF:59:9F Timestamp : Oct 18 18:01:32.528 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:23:B8:76:15:2A:9E:47:47:AD:9C:ED:BD: 22:0B:F1:03:AE:6A:33:BE:B1:87:8C:C8:71:E2:C2:FC: 77:D1:D1:2A:02:21:00:ED:A5:27:D1:24:F4:74:64:39: 7C:98:97:1E:D2:DF:68:30:6D:C3:CF:70:F7:57:D4:2A: 63:19:5D:F4:FA:EC:23 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 1A:8B:9D:6B:8D:D7:91:D1:CD:05:49:ED:B6:03:55:D6: 06:B6:4F:AD:30:DB:71:FE:78:8F:0F:C7:C8:FB:C4:B1 Timestamp : Oct 18 18:01:33.579 2026 GMT Extensions: 00:00:05:00:0A:66:DA:8B Signature : ecdsa-with-SHA256 30:46:02:21:00:8F:E6:FB:BD:AA:52:06:4C:D8:AE:15: 27:91:89:76:54:AD:05:E9:0A:19:96:83:57:78:A3:30: 48:D8:AE:E0:B2:02:21:00:F1:57:CF:2B:CD:44:8D:E4: D9:29:E7:80:5D:A6:F4:B0:56:C2:FC:A5:28:70:40:17: 46:58:46:AC:6E:92:65:89
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: ECDHE-RSA-AES256-GCM-SHA384 · Checked 2026-10-18T22:20:15+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=US O=Let's Encrypt CN=YR1
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
685
Serial (hex)
A20253F15F2691C05DC1CE13B9BCCA4E
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

13:94:96:34:D9:9C:D6:FD:6A:A8:0B:C0:34:FE:FA:CC:EB:19:69:FE:EF:98:65:86:71:3E:CD:BB:05:75:8D:3F
Certificate extensions & PEM
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
1F:2F:35:BE:46:14:82:CD:40:B1:AE:79:2C:55:78:FA:F7:D4:68:FB
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
2146
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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