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

optical.no · 91.90.47.251:443

Verified

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

Subject
CN=citycom.no
Issuer
C=US O=Let's Encrypt CN=YR1
Valid from
2026-10-26T15:52:57+00:00
Expires
2027-01-24T15:52:56+00:00
Days remaining
87
Serial (hex)
0694B5F2D18217842B796310E5FAC2540A6E
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:blix.com, DNS:blix.eu, DNS:blixhost.no, DNS:blixsolution.no, DNS:blixsolutions.no, DNS:citycom.no, DNS:grayfiber.no, DNS:greyfiber.no, DNS:optical.no, DNS:reminder.no, DNS:www.blix.com, DNS:www.blix.eu, DNS:www.blixhost.no, DNS:www.blixsolution.no, DNS:www.blixsolutions.no, DNS:www.optical.no, DNS:www.reminder.no

SHA-256 fingerprint

2A:0B:B7:3C:2E:84:D8:0D:00:6D:C6:FC:94:37:88:F2:C7:6B:DE:7D:AC:4B:E6:FC:64:C5:84:34:81:67:50:81
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
9E:0B:B2:93:4A:D7:BE:BF:53:30:93:6A:4C:C5:59:3B:61:90:54:27
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:blix.com, DNS:blix.eu, DNS:blixhost.no, DNS:blixsolution.no, DNS:blixsolutions.no, DNS:citycom.no, DNS:grayfiber.no, DNS:greyfiber.no, DNS:optical.no, DNS:reminder.no, DNS:www.blix.com, DNS:www.blix.eu, DNS:www.blixhost.no, DNS:www.blixsolution.no, DNS:www.blixsolutions.no, DNS:www.optical.no, DNS:www.reminder.no
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr1.c.lencr.org/111.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 44:C2:BD:0C:E9:14:0E:64:A5:C9:4A:01:93:0A:5A:A1: BB:35:97:0E:00:EE:11:16:89:68:2A:1C:44:D7:B5:66 Timestamp : Oct 26 16:51:27.968 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:AA:0F:AB:DC:34:AC:2C:79:19:B7:2D: 23:D2:2C:C0:E2:1F:F2:63:C6:E0:7F:7F:1B:31:DE:92: B5:37:63:5B:FB:02:20:0D:D5:B5:D6:84:7C:FB:B2:55: D5:A0:7E:2F:7E:CE:48:35:5C:D2:E2:46:08:2E:2D:74: BA:B5:9E:D2:7E:54:64 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 59:6E:6C:33:86:94:B2:59:72:A2:56:C8:A0:E8:DD:90: 4A:76:E8:08:3D:DA:87:3B:01:08:38:28:14:3C:EE:59 Timestamp : Oct 26 16:51:28.096 2026 GMT Extensions: 00:00:05:00:15:83:C4:27 Signature : ecdsa-with-SHA256 30:46:02:21:00:AD:94:46:F6:69:E5:B7:B5:67:EF:00: 0D:77:71:54:A3:FD:7D:92:9F:BE:AD:C1:14:FC:AD:45: 78:5F:40:36:81:02:21:00:BE:B2:AA:BE:2C:7A:84:7D: FA:A7:A6:B1:0E:AB:9C:B9:EA:ED:85:5D:8D:96:E1:1E: 59:77:D9:31:37:D4:CC:E8
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-10-28T23:31:22+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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