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

cow.steack.fr · 45.145.167.43:443

Verified

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

Subject
CN=cow.steack.fr
Issuer
C=US O=Let's Encrypt CN=YR1
Valid from
2026-09-08T07:26:46+00:00
Expires
2026-12-07T07:26:45+00:00
Days remaining
59
Serial (hex)
06D55161E6AD5F4384F4FC36BDC0012E79F2
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:autoconfig.assospl.com, DNS:autoconfig.feelb.io, DNS:autoconfig.feelb.tech, DNS:autoconfig.hostmyservers.fr, DNS:autodiscover.feelb.fr, DNS:autodiscover.feelb.io, DNS:autodiscover.feelb.tech, DNS:autodiscover.hostmyservers.fr, DNS:cow.steack.fr

SHA-256 fingerprint

E8:CA:3A:78:05:05:D6:88:90:CC:34:D2:8F:E9:01:8C:65:27:5E:66:71:3B:B2:D9:C0:EC:36:A9:31:88:B4:1F
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
2F:5E:89:07:A4:20:10:E8:E9:A1:34:48:14:85:A2:27:10:40:11:D1
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:autoconfig.assospl.com, DNS:autoconfig.feelb.io, DNS:autoconfig.feelb.tech, DNS:autoconfig.hostmyservers.fr, DNS:autodiscover.feelb.fr, DNS:autodiscover.feelb.io, DNS:autodiscover.feelb.tech, DNS:autodiscover.hostmyservers.fr, DNS:cow.steack.fr
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr1.c.lencr.org/115.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : D7:6D:7D:10:D1:A7:F5:77:C2:C7:E9:5F:D7:00:BF:F9: 82:C9:33:5A:65:E1:D0:B3:01:73:17:C0:C8:C5:69:77 Timestamp : Sep 8 08:25:17.126 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:56:68:A8:6B:4B:44:39:D4:C4:75:9D:7C: 0F:07:34:98:76:DD:11:6A:9C:47:09:80:B1:F5:7A:67: 2A:4E:9D:35:02:20:45:78:A2:1F:D4:59:90:5B:9E:AB: D3:E8:D8:C3:08:84:4F:6F:EC:11:BC:86:4A:41:BF:96: 10:74:43:6C:99:F0 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 8 08:25:15.217 2026 GMT Extensions: 00:00:05:00:3E:9D:52:2D Signature : ecdsa-with-SHA256 30:45:02:20:11:96:C0:A4:33:66:2F:8A:EA:FB:42:FE: FA:5C:65:E8:F0:96:25:EB:60:A0:16:8C:32:19:09:62: A0:32:C1:52:02:21:00:AB:58:86:7A:9E:0E:0C:30:F0: AD:E3:2B:2E:7F:27:0C:E5:A7:24:BD:15:75:C9:68:C5: 29:D0:96:68:3E:0D:D1
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-10-09T05:34:39+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
694
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
2155
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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