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 yc.edu
Valid- Issued by (CA)
- Internet2
- Subject
- *.yc.edu
- Valid from
- Aug 20, 2026
- Valid until
- Mar 7, 2027 (112 days remaining)
- Public key
- RSA 2048-bit
- Serial
- D72C42F71871603D592B190A92BACD
- SHA-256 fingerprint
- 82:2E:7C:7B:77:79:91:40:E6:F4:AD:9A:3E:2C:9D:79:16:A2:FB:5B:0A:D7:39:78:71:29:CF:1D:6F:D9:19:E1
- Chain
- InCommon Intermediate CA - DVG2C → emSign Root TLS CA - G1 → emSign Root CA - G1
Certificate Authority Authorization (CAA)
CAA restricts issuance to amazon.com, comodoca.com, emsign.com, letsencrypt.org, sectigo.com, ssl.com; we couldn't map the serving CA (Internet2) to one of these identifiers.
This certificate has been served since Nov 8, 2026.
Never get surprised by yc.edu's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch yc.edu 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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.