SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
guru139.net
SSL/TLS Certificate
SSL/TLS Certificate for guru139.net
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- guru139.net
- Valid from
- Jul 29, 2026
- Valid until
- Oct 27, 2026 (34 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05D8854F9FBADF967463C1EB91CB4F23D4C0
- SHA-256 fingerprint
- 1F:6E:C6:92:40:46:20:A2:B3:EE:2E:83:4D:3B:B6:98:63:7C:3F:C7:A4:EA:CC:DA:9B:B9:9A:AA:6F:A2:58:42
- Chain
- YR1 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
The serving CA (Let's Encrypt) is authorized by this domain's CAA records (letsencrypt.org).
This certificate has been served since Sep 22, 2026.
Never get surprised by guru139.net's certificate expiring
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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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