SSL/TLS Certificate Lookup

Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted

css-testing.co.uk

SSL/TLS Certificate

WhoisRDAPDNS RecordsCertificateUptimeDiagnosticsHistoryHide Contact Info

SSL/TLS Certificate for css-testing.co.uk

Hostname mismatch
Issued by (CA)
Microsoft Corporation
Subject
*.azurewebsites.net
Valid from
Aug 28, 2026
Valid until
Dec 5, 2026 (69 days remaining)
Public key
RSA 2048-bit
Serial
5500BE0F839C1E081162E70D2F000000BE0F83
SHA-256 fingerprint
A4:26:DC:BF:C1:DB:6C:E2:F7:94:2A:4A:9F:DC:28:7D:E1:55:16:9A:45:9F:D6:C4:72:9F:A5:F6:11:5B:8A:44
Chain
Microsoft TLS G2 RSA CA OCSP 16 → Microsoft TLS RSA Root G2 → DigiCert Global Root G2
Subject Alternative Names (30)
*.02.uksouth.c.azurewebsites.net, *.azure-mobile.net, *.azurewebsites.net, *.global-01.azurewebsites.net, *.scm.02.uksouth.c.azurewebsites.net, *.scm.azure-mobile.net, *.scm.azurewebsites.net, *.scm.uksouth-01.azurewebsites.net, *.scm.uksouth-02.azurewebsites.net, *.scm.uksouth-03.azurewebsites.net, *.scm.uksouth-04.azurewebsites.net, *.scm.uksouth-05.azurewebsites.net, *.scm.uksouth-06.azurewebsites.net, *.scm.uksouth.c.azurewebsites.net, *.sso.02.uksouth.c.azurewebsites.net, *.sso.azurewebsites.net, *.sso.uksouth-01.azurewebsites.net, *.sso.uksouth-02.azurewebsites.net, *.sso.uksouth-03.azurewebsites.net, *.sso.uksouth-04.azurewebsites.net, *.sso.uksouth-05.azurewebsites.net, *.sso.uksouth-06.azurewebsites.net, *.sso.uksouth.c.azurewebsites.net, *.uksouth-01.azurewebsites.net, *.uksouth-02.azurewebsites.net, *.uksouth-03.azurewebsites.net, *.uksouth-04.azurewebsites.net, *.uksouth-05.azurewebsites.net, *.uksouth-06.azurewebsites.net, *.uksouth.c.azurewebsites.net

Certificate Authority Authorization (CAA)

No CAA policy is published for this domain — any certificate authority may issue for it.

Never get surprised by css-testing.co.uk's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch css-testing.co.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.

Monitor this certificate free

Free for your first domain: uptime, DNS, and certificate together. No credit card.