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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

TLSv1.3

mail.netsurf.net · 139.162.181.76:443

Unverified
Certificate verification failed. These are unverified certificate details presented by the server. SSL operation failed with code 1. OpenSSL Error messages: error:0A000086:SSL routines::certificate verify failed

Certificate verification failed

Subject
CN=netsurf.net
Issuer
C=US O=Let's Encrypt CN=YR2
Valid from
2026-10-18T18:43:08+00:00
Expires
2027-01-16T18:43:07+00:00
Days remaining
65
Serial (hex)
0576788D63FEB50F4826B76D6BE120C77E9B
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:*.netsurf.net, DNS:netsurf.net

SHA-256 fingerprint

50:63:8B:45:6F:AE:F3:72:4D:93:C6:70:7F:65:B0:2B:02:17:CC:B9:54:78:24:7C:A7:5E:03:5E:F9:7D:78:F0
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
18:02:60:6F:26:FA:5F:B1:84:59:9E:DC:8B:75:5F:BA:7D:42:B7:7A
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:*.netsurf.net, DNS:netsurf.net
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr2.c.lencr.org/28.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 19:41:38.130 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:97:F4:91:A2:E3:90:31:66:6A:69:B3: CC:C1:14:6B:19:FE:AE:77:7F:07:53:2C:EF:F8:8E:3B: 65:36:D6:E1:BE:02:21:00:F0:DF:7A:9C:6D:D0:CF:53: 7A:11:28:F4:3A:A0:A9:E1:51:86:A0:63:02:08:0D:08: A1:9B:8F:61:A7:45:C6:7D Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 44:E8:22:FC:2B:AB:0E:92:EE:D0:E9:FA:D6:96:64:60: 27:76:D0:17:60:E0:89:05:09:C9:23:A1:B0:3F:C3:7F Timestamp : Oct 18 19:41:35.052 2026 GMT Extensions: 00:00:05:00:0C:63:9B:CD Signature : ecdsa-with-SHA256 30:45:02:20:40:7B:36:5F:F7:CA:04:AB:05:0B:D7:D6: 5F:9B:84:A7:1B:DD:98:EC:57:33:37:FC:B4:5C:39:A0: 1B:45:8C:83:02:21:00:E4:4F:AB:2A:6B:A0:D1:88:5E: 32:D4:19:44:BE:F3:94:40:FE:CF:9D:D7:E9:68:FD:5E: 38:52:E3:D5:0A:55:1E
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-11-12T00:52:10+00:00

Server-presented chain · 1 additional certificate

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
660
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-----

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

View certificate JSON

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