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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.koumbit.net · 199.58.80.81:443

Verified

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

Subject
CN=imap.koumbit.net
Issuer
C=US O=Let's Encrypt CN=YR1
Valid from
2026-09-25T04:36:18+00:00
Expires
2026-12-24T04:36:17+00:00
Days remaining
66
Serial (hex)
05EAD3545D672040B252C35DB0B8AD9CF601
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:imap.koumbit.net, DNS:mail.koumbit.net, DNS:pop.koumbit.net, DNS:smtp.koumbit.net

SHA-256 fingerprint

DD:F7:C5:50:31:D0:C3:87:B6:BD:CA:BB:55:AC:86:09:FD:36:66:89:FF:EB:B7:B4:A2:6A:C0:DF:4D:9B:68:20
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
55:ED:6B:5C:38:1F:3A:47:42:F9:9F:EA:2C:6F:86:41:BF:68:CA:FC
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:imap.koumbit.net, DNS:mail.koumbit.net, DNS:pop.koumbit.net, DNS:smtp.koumbit.net
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr1.c.lencr.org/2.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 26:E3:64:6E:58:69:21:23:BC:34:3F:47:24:35:9B:37: 92:CD:24:5A:88:D8:15:D3:93:33:FD:99:18:AB:47:23 Timestamp : Sep 25 05:34:46.570 2026 GMT Extensions: 00:00:05:00:46:2F:DB:FC Signature : ecdsa-with-SHA256 30:46:02:21:00:D6:8B:45:0B:B8:F7:96:FD:DA:60:02: 84:D6:0E:5D:C3:12:B7:E4:45:AF:29:26:FE:7A:C9:92: 8C:27:A9:82:A4:02:21:00:E5:D7:7C:6F:8A:5F:1C:C1: F9:18:99:DD:5F:5D:39:7F:CE:4D:31:C7:D3:A3:4D:86: 6C:FB:F7:70:D3:7E:03:1A Signed Certificate Timestamp: Version : v1 (0x0) Log ID : C8:A3:C4:7F:C7:B3:AD:B9:35:6B:01:3F:6A:7A:12:6D: E3:3A:4E:43:A5:C6:46:F9:97:AD:39:75:99:1D:CF:9A Timestamp : Sep 25 05:34:49.125 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:70:98:52:A7:F0:03:3A:80:AD:9F:B1:AE: 96:7D:61:09:01:0E:20:6A:5F:8D:7E:74:65:BA:5D:58: 59:34:0A:37:02:20:0D:CB:7D:A3:0D:2D:34:7A:1D:BC: FB:13:13:57:8D:8B:57:FF:1E:2B:38:41:E3:05:C8:49: 4B:4B:E3:A5:97:5B
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: ECDHE-RSA-AES128-GCM-SHA256 · Checked 2026-10-18T23:21:58+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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