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 heym.run
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- heym.run
- Valid from
- Jul 24, 2026
- Valid until
- Oct 22, 2026 (49 days remaining)
- Public key
- EC 256-bit
- Serial
- 0677DB6ED238B71AC75EDF4D57DA5850D905
- SHA-256 fingerprint
- CE:80:88:69:1E:F3:46:34:97:F7:7C:4E:E6:C8:FD:CB:E8:3F:0D:2D:A8:5D:7B:BE:BD:87:71:CC:71:26:BD:91
- Chain
- YE1 → 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 Aug 3, 2026.
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Uptime
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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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