For advanced users, Reflect4 UPD lists may include:
Ensure the Reflect4 mirror itself starts with https:// to encrypt the connection between you and the proxy. Reflect4 Proxy List UPD Free
If you are authorized, use controlled lists from your own scans (e.g., nmap -sU -p 53,123,1900 --open on your own IP ranges). For advanced users, Reflect4 UPD lists may include:
The term likely originated from proxy aggregation scripts or specific GitHub repositories that "reflect" (mirror) proxy lists from various online scanners (like Shodan, Censys, or public proxy checkers). The number "4" often denotes the version or a specific script iteration used to generate the list. For advanced users
Once you have downloaded the reflect4_updated.txt file, here is how to implement it.