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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

openitc.co.uk · 149.255.100.80:443

Verified

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

Subject
CN=openitc.co.uk
Issuer
C=US O=Let's Encrypt CN=YR2
Valid from
2026-08-23T00:09:36+00:00
Expires
2026-11-21T00:09:35+00:00
Days remaining
52
Serial (hex)
05A4A986E48AF4752F54A162BACA80AC1357
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:openitc.co.uk, DNS:www.openitc.co.uk

SHA-256 fingerprint

30:A6:D4:C7:E6:95:C5:36:68:FF:79:C1:B1:D7:31:F7:53:D5:77:5E:86:B1:E3:57:68:F2:B1:B8:C4:F3:00:6D
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
39:9E:FA:59:4B:3E:CB:D2:7F:2D:34:77:D7:D7:9B:66:11:2D:56:5F
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:openitc.co.uk, DNS:www.openitc.co.uk
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr2.c.lencr.org/88.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : C2:31:7E:57:45:19:A3:45:EE:7F:38:DE:B2:90:41:EB: C7:C2:21:5A:22:BF:7F:D5:B5:AD:76:9A:D9:0E:52:CD Timestamp : Aug 23 01:08:06.735 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:30:45:F6:F7:D2:2D:93:DE:59:C1:94:F0: C7:7B:09:1E:96:D3:AF:F2:E0:FF:F5:5A:8D:AB:7F:6F: 0C:4A:03:14:02:20:46:64:1F:98:FD:E4:27:F4:45:BB: 4C:91:A8:CA:92:2D:54:37:DB:1C:50:E1:21:18:3D:9A: BD:9C:01:D2:22:04 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : A8:26:CB:E3:0A:C6:35:12:46:53:3F:E0:65:F1:4F:19: D9:6E:19:08:13:C4:1D:D9:6D:79:00:B3:12:3C:55:27 Timestamp : Aug 23 01:08:07.692 2026 GMT Extensions: 00:00:05:00:22:27:99:16 Signature : ecdsa-with-SHA256 30:45:02:20:55:93:C6:A9:C3:0D:ED:5F:56:36:55:EA: EE:E5:B4:52:6B:75:4F:AA:F9:A3:51:F8:40:F1:F7:18: B2:46:49:72:02:21:00:FA:05:7E:69:91:D6:B3:B2:66: 20:65:38:72:02:92:1F:CC:F6:4D:7C:F3:6F:9D:1D:B0: 62:A1:2A:C1:0F:23:AE
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-09-29T10:25:19+00:00

Server-presented chain · 2 additional certificates

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
704
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-----

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
2165
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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