SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
go-action.school
SSL/TLS Certificate
SSL/TLS Certificate for go-action.school
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- *.go-action.school
- Valid from
- Sep 11, 2026
- Valid until
- Dec 10, 2026 (64 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05FD4828DE580375C57A1AFC6D6BD54AD123
- SHA-256 fingerprint
- 61:64:27:14:35:74:D3:04:A8:74:B6:E3:FE:44:3C:E4:81:5F:7E:E7:EF:63:39:EB:07:93:2C:94:24:9F:23:2C
- 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.
This certificate has been served since Sep 30, 2026.
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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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