SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
st-marks.lancs.sch.uk
SSL/TLS Certificate
SSL/TLS Certificate for st-marks.lancs.sch.uk
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- st-marks.lancs.sch.uk
- Valid from
- Jul 19, 2026
- Valid until
- Oct 17, 2026 (38 days remaining)
- Public key
- EC 256-bit
- Serial
- 05B098A223225516DEABD131925B2B81AACE
- SHA-256 fingerprint
- B3:BD:49:19:A9:03:D5:12:65:62:69:F6:5D:0F:5D:1A:9A:76:B6:3A:8B:8F:A7:6D:75:DE:F4:F7:5D:37:62:52
- Chain
- YE2 → Root YE → ISRG Root X2 → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
This certificate has been served since Jul 31, 2026.
Never get surprised by st-marks.lancs.sch.uk's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch st-marks.lancs.sch.uk continuously, notifying you the moment anything moves across all three signals:
Uptime
We visit the site from multiple regions worldwide and email you within minutes if it goes down, with a per-region breakdown so a real outage stands out from a regional blip.
DNS changes
We watch NS, MX, CAA, DNSSEC, CNAME and A/AAAA records, and identify the host, network, and ASN behind them, so a real migration or hijack stands out from routine noise.
TLS certificate
We warn you 30, 14, 7, and 1 days before it expires, and flag it if the issuing authority changes or the certificate is unexpectedly replaced.
Free for your first domain: uptime, DNS, and certificate together. No credit card.