SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
proton-dns.com
SSL/TLS Certificate
SSL/TLS Certificate for proton-dns.com
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- proton-dns.com
- Valid from
- Aug 31, 2026
- Valid until
- Nov 29, 2026 (66 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05C63DBCEDA7CB81963AD264F6DF28EDFE34
- SHA-256 fingerprint
- 62:BC:DD:9C:38:98:31:55:15:5E:EF:F0:F7:66:EC:9B:B9:9F:04:F4:79:06:F1:29:76:1A:2F:80:DC:0B:A3:F7
- 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.
This certificate has been served since Sep 15, 2026.
Never get surprised by proton-dns.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch proton-dns.com 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.
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