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HTML

            
              <div ng-app="vlsm" class="container-fluid">
	<div ng-controller="MainController" class="row">
		<div class="col-12 oculto-impresion">
			<div class="form-group">
				<label for="hosts">Escribe los hosts separados con una coma, no importa el orden</label>
				<textarea ng-change="quitarTabla()" ng-model="hosts" name="" id="hosts" cols="30" rows="1" class="form-control"></textarea></div>
			<div class="form-group">
				<label for="ip">Escribe la ip:</label>
				<input ng-change="quitarTabla()" ng-model="ip" type="text" class="form-control">
			</div>
			<div class="form-group">
				<button ng-click="calcular(hosts, ip)" class="btn btn-primary">Calcular</button>
			</div>
		</div>
		<div class="col-12 visible-impresion">
			<h1>VLSM</h1>
			<p>
				Para los hosts: <strong>{{hosts}}</strong><br>
				Usando la ip: <strong>{{ip}}</strong>
			</p>
		</div>
		<div class="col-12 oculto-impresion"  ng-show="ips">
			<button ng-click="imprimir()" class="btn btn-success">Imprimir o guardar como PDF</button><br><br>		
		</div>
		<div class="col-12" ng-show="ips">
			<table class="table table-bordered table-striped table-sm">
			  <thead>
				<tr>
				  <th>Pos.</th>
				  <th>IP</th>
				  <th>Rango</th>
				  <th>Broadcast</th>
				  <th>/Máscara</th>
				  <th>Máscara de subred</th>
				</tr>
			  </thead>
			  <tbody>
				<tr ng-repeat="ip in ips track by $index">
				  <td>{{getPosition($index)}} ({{$index + 1}})</td>
				  <td>{{ip.ip}}</td>
				  <td>{{ip.rango}}</td>
				  <td>{{ip.broadcast}}</td>
				  <td>{{ip.mascaraDiagonal}}</td>
				  <td>{{ip.mascara}}</td>
				</tr>
			  </tbody>
			</table>
		</div>
	</div>
</div>
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CSS

            
              @media print{
	.oculto-impresion, .oculto-impresion *{
		display: none !important;
	}
	.visible-impresion{}
}
@media screen{
	.visible-impresion{
		display: none !important;
	}
}
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JS

            
              angular
.module("vlsm", [])
.constant("POSICIONES", "primera segunda tercera cuarta quinta sexta séptima octava novena décima decimoprimera decimosegunda decimotercera decimocuarta decimoquinta".split(" "))
.constant("REGEX_IP", /^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/)
.constant("CLASE_C", {
	maximoNumeroHosts: 254,
	potenciaMinima: 2,
	potenciaMaxima: 8,
	bitsMascara: 24,
	bitsPorOcteto: 8,
	hostsPorSubred: 126
})
.controller("MainController", ["$scope","CLASE_C","REGEX_IP", "POSICIONES", ($scope, CLASE_C, REGEX_IP, POSICIONES)=>{
	$scope.imprimir = ()=>{
		window.print();
	};
	$scope.getPosition = index => POSICIONES[index];
	$scope.quitarTabla = () => {
		$scope.ips = null;
	};
	$scope.ip = "192.168.1.0";
	$scope.hosts = "50,8,21,25,5,18,4,10,5,9,5";
	$scope.obtenerPotenciaSuficiente = numeroHosts => {
		if(numeroHosts > CLASE_C.maximoNumeroHosts) throw Error("¡Más hosts de los permitidos!");
		for(let x = CLASE_C.potenciaMinima; x <= CLASE_C.potenciaMaxima; x++)
			if(Math.pow(2, x) - 2 >= numeroHosts) return x;
	};
	
	$scope.parsearIp = ip => ip.split(".");
	
	$scope.obtenerNumeroDeHostQueDeberiaUsar = (numeroHosts, potencia) => Math.pow(2, potencia);
	$scope.calcularMascara = bitsPrestados =>{
		let posiciones = [128,64,32,16,8,4,2,1], mascara = 0;
		for(let x = 0; x < bitsPrestados; x++) mascara += posiciones[x];
		return mascara;
	};
	$scope.calcular = (hosts, ip) =>{
		if(hosts && ip){
			if(!REGEX_IP.test(ip)){
				alert("Parece que no pusiste una dirección ipv4 válida");
				return;
			}
			let arregloHosts = hosts.trim().split(","), octetos = $scope.parsearIp(ip);
			if(arregloHosts.length > 0){
				//Los convertimos a enteros para después ordenarlos
				arregloHosts = arregloHosts.map(host => parseInt(host));
				
				//Comprobar si todos los hosts pueden ocupar una subred
				arregloHosts.forEach(host => {
					if(host > CLASE_C.hostsPorSubred){
						alert(`¡No puedes tener una subred con más de ${CLASE_C.hostsPorSubred} hosts!`);
						$scope.quitarTabla();
						return;
					}
				});
				
				//Comprobar si la suma no es mayor a la cantidad máxima
				let suma = arregloHosts.reduce((a, b) => a + b, 0);
				if(suma >= CLASE_C.maximoNumeroHosts + 1){
					alert(`El número total de hosts (${suma}) supera al límite de hosts para la subred (${CLASE_C.maximoNumeroHosts + 1})`);
					$scope.quitarTabla();
					return;
				}
				
				//Los ordenamos de mayor a menor
				arregloHosts = arregloHosts.sort((a,b) => b - a);
				let contador = 0, ips = [];
				arregloHosts.forEach(host => {
					if(contador >= CLASE_C.maximoNumeroHosts) {
						alert(`¡No puedes tener más de ${CLASE_C.maximoNumeroHosts} hosts en la red!`);
						$scope.quitarTabla();
						return;
					}
					let potencia = $scope.obtenerPotenciaSuficiente(host),
						numeroHosts = $scope.obtenerNumeroDeHostQueDeberiaUsar(host, potencia),
						primerosTresOctetos = `${octetos[0]}.${octetos[1]}.${octetos[2]}`,
						bitsTomados = CLASE_C.bitsPorOcteto - potencia;
					ips.push({
						ip: `${primerosTresOctetos}.${contador}`,
						rango: `${contador + 1} - ${contador + numeroHosts - 2}`,
						broadcast: `${primerosTresOctetos}.${contador + numeroHosts - 1}`,
						mascaraDiagonal: `/${CLASE_C.bitsMascara + bitsTomados}`,
						mascara: `255.255.255.${$scope.calcularMascara(bitsTomados)}`
					});
					contador += numeroHosts;
				});
				$scope.ips = ips;
			}
		}
	};
}]);
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