RunKit + 
Try any Node.js package right in your browser
This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 1,000,000+ packages pre-installed, including ip-subnet-calculator. Try it out:
var ipsc = require( 'ip-subnet-calculator' );
console.log( 'Is "127.0.0.1" an IP?', ipsc.isIp( '127.0.0.1' ) );
console.log( 'What is numeric representation of "127.0.0.1"?', ipsc.toDecimal( '127.0.0.1' ) );
console.log( 'Mask for 5.4.3.21-6.7.8.9', ipsc.calculate( '5.4.3.21', '6.7.8.9' ) );
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require()any package directly from npm- use arrow functions, classes, template strings, and most of ES6
awaitany promise instead of using callbacks (example)- create your own embedded node.js snippets
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