SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
1-testing.com
SSL/TLS Certificate
SSL/TLS Certificate for 1-testing.com
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- 1-testing.com
- Valid from
- Sep 23, 2026
- Valid until
- Dec 22, 2026 (46 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05BE5391A36EF2DC0322B74D083B1133AA0E
- SHA-256 fingerprint
- D2:E4:EF:ED:C6:03:3A:A9:E6:1D:65:0C:48:0A:3B:F7:6E:9C:9B:3B:EF:1E:5C:5C:A8:27:19:34:A9:D2:E8:C0
- Chain
- YR1 → 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 Oct 1, 2026.
Never get surprised by 1-testing.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch 1-testing.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, CNAME, TXT 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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