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Hello, 1000 Ipv6 Proxies need lot of ram on server, because of this its recomanded to create up-to 600 Ipv6 Proxies on single instance or you need to have harware, that can handle so much IPs. Next yes from cloud tools its possible to generate IPv6 Proxies on Vultr, Hetzner and Digital Ocean (only up-to 16).
Else there is Merchant Tool -> IPv6 Generator Template, that can be used to turn VPS with IPv6 subnet into multiple IPv6 Proxy Server.