> ## Documentation Index
> Fetch the complete documentation index at: https://docs.joinmassive.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How do I authenticate with ISP proxies?

Massive ISP proxies support three protocols:

1. HTTP (Port 8000):

```bash theme={null}
curl --proxy http://isp.joinmassive.com:8000 -U '{PROXY_USERNAME}:{PROXY_PASSWORD}' https://cloudflare.com/cdn-cgi/trace
```

2. HTTPS (Port 4080):

```bash theme={null}
curl --proxy https://isp.joinmassive.com:4080 -U '{PROXY_USERNAME}:{PROXY_PASSWORD}' https://cloudflare.com/cdn-cgi/trace
```

3. SOCKS5 (Port 8000):

```bash theme={null}
curl -x socks5h://isp.joinmassive.com:8000 -U '{PROXY_USERNAME}:{PROXY_PASSWORD}' https://www.cloudflare.com/cdn-cgi/trace
```

Replace `PROXY_USERNAME` and `PROXY_PASSWORD` with your credentials.