SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
12-21.group
SSL/TLS Certificate
SSL/TLS Certificate for 12-21.group
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- 12-21.group
- Valid from
- Jul 31, 2026
- Valid until
- Oct 29, 2026 (48 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 06AFE6E77193689D9197F921D1B31E3AE352
- SHA-256 fingerprint
- 15:EA:00:5B:88:9D:D4:4A:51:4F:D7:B8:6C:8C:66:CD:82:E6:CF:61:BE:03:A4:65:17:73:15:F5:AF:19:0C:FE
- 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 12-21.group's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch 12-21.group 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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