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

newtel.cz · 78.41.19.19:443

Verified

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

Subject
CN=newtel.cz
Issuer
C=US O=Let's Encrypt CN=YR1
Valid from
2026-09-29T22:00:52+00:00
Expires
2026-12-28T22:00:51+00:00
Days remaining
61
Serial (hex)
0506DDCF72E124727B8EBCF1FDF0D434E09F
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:newtel.cz, DNS:www.newtel.cz

SHA-256 fingerprint

32:F5:D4:AE:9E:BE:9C:8C:13:89:10:F6:F9:CA:5C:1C:65:71:1B:C0:E5:38:0F:EC:67:58:BE:DD:90:18:68:03
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
3D:01:9F:62:BF:E1:40:7A:A3:11:F1:E7:D2:4D:C3:92:9E:D1:F0:A2
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:newtel.cz, DNS:www.newtel.cz
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr1.c.lencr.org/32.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : AF:67:88:3B:57:B0:4E:DD:8F:A6:D9:7E:F6:2E:A8:EB: 81:0A:C7:71:60:F0:24:5E:55:D6:0C:2F:E7:85:87:3A Timestamp : Sep 29 22:59:22.766 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:FC:D6:32:65:31:A6:9B:65:35:F9:DD: A4:74:8A:43:E5:AF:41:C1:F4:9B:8E:EA:3E:88:2F:7C: 6D:6F:56:A4:C0:02:20:60:26:A7:A5:8A:11:E6:50:F1: AF:44:56:E4:0F:D1:2D:D0:BF:BF:C6:83:D7:DF:D4:8E: 58:C4:6C:C2:1E:95:2E Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 1A:8B:9D:6B:0F:FE:BF:81:B4:79:39:C6:D2:31:0A:86: D6:D1:02:D4:F0:46:E2:18:2C:9D:E3:5F:5E:26:25:EF Timestamp : Sep 29 22:59:23.364 2026 GMT Extensions: 00:00:05:00:46:90:F1:9B Signature : ecdsa-with-SHA256 30:45:02:20:05:E5:EF:A8:83:E3:D3:0B:9B:57:FA:CB: 75:07:6E:EC:DC:BC:BB:05:BC:B8:42:2E:0A:32:55:43: 2F:6C:4F:93:02:21:00:B4:A2:20:00:7A:8A:EA:13:7B: 9B:82:F6:8E:DD:91:75:21:47:D2:D0:85:2F:AD:D6:AE: 58:F7:6A:5B:0D:89:5B
-----BEGIN CERTIFICATE-----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=
-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-10-28T14:23:56+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
675
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
2136
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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