SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
fourty-two.net
SSL/TLS Certificate
SSL/TLS Certificate for fourty-two.net
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- fourty-two.net
- Valid from
- Nov 1, 2026
- Valid until
- Jan 30, 2027 (85 days remaining)
- Public key
- EC 256-bit
- Serial
- 0510652C804F666FD29C0C090D26FA1C9305
- SHA-256 fingerprint
- C8:19:16:91:47:4A:39:10:C7:1A:21:4B:62:96:1C:09:32:EB:6F:B7:F8:25:DC:C3:FC:FF:73:04:0C:46:C1:67
- Chain
- YE2 → Root YE → ISRG Root X2 → ISRG Root X1
Certificate Authority Authorization (CAA)
The serving CA (Let's Encrypt) is authorized by this domain's CAA records (letsencrypt.org).
Never get surprised by fourty-two.net's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch fourty-two.net 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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