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 1-b.by
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- 1-b.by
- Valid from
- Aug 4, 2026
- Valid until
- Nov 2, 2026 (32 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06069273AAEDD5842095630991DD0038F673
- SHA-256 fingerprint
- DD:79:20:F2:D4:E9:DB:CD:03:CA:70:C2:27:66:10:24:FF:E0:9D:34:70:72:F2:93:DF:39:54:1B:CD:B5:9E:24
- 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.
We've observed 1 previous certificate for this host. This certificate has been served since Aug 18, 2026.
Never get surprised by 1-b.by's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch 1-b.by 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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.