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 rnp.br
Valid- Issued by (CA)
- REDE NACIONAL DE ENSINO E PESQUISA - RNP
- Subject
- *.rnp.br
- Valid from
- Mar 9, 2026
- Valid until
- Apr 10, 2027 (259 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 1883FDF3A2B70E72C20C8772
- SHA-256 fingerprint
- 21:BD:30:16:15:AB:DB:16:DB:30:C5:A2:91:3D:87:F7:F5:F4:3F:80:5D:BD:04:9C:14:5A:09:14:75:E1:98:9A
- Chain
- RNP ICPEdu GR46 OV TLS CA 2025 → GlobalSign Root R46
Certificate Authority Authorization (CAA)
CAA restricts issuance to digicert.com, globalsign.com, letsencrypt.org, pki.goog; we couldn't map the serving CA (REDE NACIONAL DE ENSINO E PESQUISA - RNP) to one of these identifiers.
Never get surprised by rnp.br's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch rnp.br 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.