SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
SSL/TLS Certificate for a-k.app
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- a-k.app
- Valid from
- Sep 11, 2026
- Valid until
- Dec 10, 2026 (79 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0554E04BEE6CBF387E7C90C5FB453B760941
- SHA-256 fingerprint
- 09:EF:49:FA:2C:12:7E:11:84:76:F5:F7:FF:1C:80:D8:C5:6B:8E:65:4F:1C:44:2B:B3:C5:F9:0C:ED:97:2C:37
- Chain
- YR2 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by a-k.app's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch a-k.app 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.