1. Site down, your nameservers are down

Response

Hi, José Miguel here from Cloudflare Support — thanks for reaching out! Your domain isn't using Cloudflare's nameservers, so Cloudflare isn't managing your DNS. This means any site access issues are likely caused by your current DNS provider or registrar. Please check your domain's nameserver settings and DNS records with your provider. If you want, I can help you switch your domain to use Cloudflare's nameservers and manage your DNS here.

Thought Process

Tools used: nslookup (Windows), dig (Linux), Cloudflare documentation

DNS Resolution Checks

C:\Users\josem>nslookup example.com
Server:  UnKnown
Address:  88.214.178.1

Non-authoritative answer:
Name:    example.com
Addresses: 96.7.128.175, 23.192.228.80, ...
      

Conclusion: DNS is working — Cloudflare nameservers are up.

Authoritative Nameservers

C:\Users\josem>nslookup -type=NS example.com

Non-authoritative answer:
example.com nameserver = a.iana-servers.net
example.com nameserver = b.iana-servers.net
      

The domain is NOT using Cloudflare nameservers.

References