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

subtopia.co.uk · 91.142.34.168:443

Verified

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

Subject
CN=aboutexpireddomains.com
Issuer
C=US O=Let's Encrypt CN=YR1
Valid from
2026-09-01T08:24:30+00:00
Expires
2026-11-30T08:24:29+00:00
Days remaining
63
Serial (hex)
0523BF5724A6B1E388F1479DDF37CA263184
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:*.aboutexpireddomains.com, DNS:*.aboutexpireddomains.net, DNS:*.aboutexpireddomains.org, DNS:*.chrissmith.info, DNS:*.devsite.com, DNS:*.devsite.org.uk, DNS:*.digidocuments.net, DNS:*.digidocuments.org, DNS:*.pcsupport.org.uk, DNS:*.subtopia.biz, DNS:*.subtopia.co.uk, DNS:*.subtopia.net, DNS:aboutexpireddomains.com, DNS:aboutexpireddomains.net, DNS:aboutexpireddomains.org, DNS:autoconfig.subtopia.org, DNS:autodiscover.subtopia.org, DNS:chrissmith.info, DNS:cpanel.subtopia.org, DNS:cpcalendars.subtopia.org, DNS:cpcontacts.subtopia.org, DNS:devsite.com, DNS:devsite.org.uk, DNS:digidocuments.net, DNS:digidocuments.org, DNS:mail.subtopia.info, DNS:mail.subtopia.org, DNS:pcsupport.org.uk, DNS:subtopia.biz, DNS:subtopia.co.uk, DNS:subtopia.info, DNS:subtopia.net, DNS:subtopia.org, DNS:webdisk.subtopia.org, DNS:webmail.subtopia.org, DNS:www.subtopia.info, DNS:www.subtopia.org

SHA-256 fingerprint

5F:24:69:4D:1E:97:31:D1:BF:D7:38:A7:61:DB:8C:AC:51:EB:BD:4D:6A:2C:1C:98:01:79:DC:5C:1E:B7:A9:58
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
27:86:49:D5:2C:DF:21:3F:B6:F0:93:29:5F:B7:27:3A:46:8D:4D:26
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:*.aboutexpireddomains.com, DNS:*.aboutexpireddomains.net, DNS:*.aboutexpireddomains.org, DNS:*.chrissmith.info, DNS:*.devsite.com, DNS:*.devsite.org.uk, DNS:*.digidocuments.net, DNS:*.digidocuments.org, DNS:*.pcsupport.org.uk, DNS:*.subtopia.biz, DNS:*.subtopia.co.uk, DNS:*.subtopia.net, DNS:aboutexpireddomains.com, DNS:aboutexpireddomains.net, DNS:aboutexpireddomains.org, DNS:autoconfig.subtopia.org, DNS:autodiscover.subtopia.org, DNS:chrissmith.info, DNS:cpanel.subtopia.org, DNS:cpcalendars.subtopia.org, DNS:cpcontacts.subtopia.org, DNS:devsite.com, DNS:devsite.org.uk, DNS:digidocuments.net, DNS:digidocuments.org, DNS:mail.subtopia.info, DNS:mail.subtopia.org, DNS:pcsupport.org.uk, DNS:subtopia.biz, DNS:subtopia.co.uk, DNS:subtopia.info, DNS:subtopia.net, DNS:subtopia.org, DNS:webdisk.subtopia.org, DNS:webmail.subtopia.org, DNS:www.subtopia.info, DNS:www.subtopia.org
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr1.c.lencr.org/5.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : CB:38:F7:15:89:7C:84:A1:44:5F:5B:C1:DD:FB:C9:6E: F2:9A:59:CD:47:0A:69:05:85:B0:CB:14:C3:14:58:E7 Timestamp : Sep 1 09:23:00.748 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:F1:D3:F7:CC:5F:F6:50:4C:78:8A:FD: 63:72:E6:05:7F:E3:2A:7D:61:9D:B3:4E:1C:44:4E:15: C4:B1:E9:B9:54:02:20:01:75:ED:CB:4F:D7:C9:6C:D0: D5:65:6F:34:41:B7:DB:F5:3F:E4:61:78:B6:11:0E:C6: 34:04:70:33:84:AB:D5 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 6C:FE:50:19:43:A8:5E:A9:16:BC:52:D1:33:E4:DC:C9: 1E:F1:41:1C:7D:25:84:20:D1:73:80:9E:18:18:EB:3A Timestamp : Sep 1 09:23:01.032 2026 GMT Extensions: 00:00:05:00:2B:73:F1:11 Signature : ecdsa-with-SHA256 30:45:02:20:18:5E:13:D1:88:F4:EA:09:FE:04:B5:8E: A5:F0:2C:92:36:B4:5E:A7:4B:C8:B8:0C:10:45:74:61: 6B:E2:1E:AB:02:21:00:DC:9B:F8:3E:C5:9C:27:69:35: 01:C9:1C:A6:98:48:7E:1E:2C:F4:82:EC:E1:BF:8C:B4: 74:9A:E4:15:85:F2:27
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-09-27T22:18:22+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
706
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
2167
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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