At a time. You can run more lists, but the code above only handles 1k

const ips = new Set();
let cursor = undefined;
while(true) {
  const result = await env.KV.list({ cursor });
  for(const { name } of result.keys) {
    ips.add(await env.KV.get(name));
  }
  if(result.list_complete) {
    break;
  }
  cursor = result.cursor;
}
console.log(Array.from(ips.values()));

const ips = new Set();
let cursor = undefined;
while(true) {
  const result = await env.KV.list({ cursor });
  for(const { name } of result.keys) {
    ips.add(await env.KV.get(name));
  }
  if(result.list_complete) {
    break;
  }
  cursor = result.cursor;
}
console.log(Array.from(ips.values()));

Access-Control-Allow-Origin: asdf.invalid

Access-Control-Allow-Origin: asdf.invalid