SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
go-def.com
SSL/TLS Certificate
SSL/TLS Certificate for go-def.com
Self-signed- Issued by (CA)
- go-def.com
- Subject
- go-def.com
- Valid from
- Oct 6, 2020
- Valid until
- Oct 6, 2021 (expired 1861 days ago)
- Public key
- RSA 2048-bit
- Serial
- 01037DA87E
- SHA-256 fingerprint
- 25:62:C8:2F:62:72:1E:21:BA:CE:2B:CF:82:75:0A:6F:97:F3:23:B8:E8:A6:5D:1E:16:6B:DA:00:06:75:81:36
- Chain
- go-def.com
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by go-def.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch go-def.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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