koa-ipblock
$ npm install --save koa-ipblock
var ipblock = require('koa-ipblock');
var app = koa();
app.use(ipblock(['114.32.*.*'])); // black list
app.use(ipblock.black(['114.32.*.*'])); // black list
app.use(ipblock.white(['127.0.0.1'])); // whit list
app.listen();
License
The MIT License (MIT)