diff --git a/admin/admin.php b/admin/admin.php
index 87a37ab..bebed67 100644
--- a/admin/admin.php
+++ b/admin/admin.php
@@ -196,7 +196,27 @@ function sanitize_ip_addresses( $val ) {
 	 */
 	private function validate_ip_address( $ip_address ) {
 
-		return filter_var( $ip_address, FILTER_VALIDATE_IP );
+		$valid = filter_var( $ip_address, FILTER_VALIDATE_IP );
+	
+		if ( ( false === $ip_address || empty( $valid ) ) && $this->is_valid_domain_name( $ip_address ) ) {
+			$valid = $ip_address;
+		}
+
+		return $valid;
+
+	}
+
+	/**
+	 * Is Valid Domain Name?
+	 *
+	 * @param   string   $domain_name  Domain name to check.
+	 * @return  boolean
+	 */
+	private function is_valid_domain_name( $domain_name ) {
+
+		return ( preg_match("/^([a-z\d](-*[a-z\d])*)(\.([a-z\d](-*[a-z\d])*))*$/i", $domain_name )  // Valid chars check
+			&& preg_match( "/^.{1,253}$/", $domain_name )                                           // Overall length check
+			&& preg_match( "/^[^\.]{1,63}(\.[^\.]{1,63})*$/", $domain_name ) );                     // Length of each label
 
 	}
 
diff --git a/password-protected.php b/password-protected.php
index 5008738..eea12aa 100644
--- a/password-protected.php
+++ b/password-protected.php
@@ -207,18 +207,19 @@ function allow_users( $bool ) {
 	}
 
 	/**
-	 * Allow IP Addresses
+	 * Allow IP Addresses and Hosts
 	 *
-	 * If user has a valid email address, return false to disable password protection.
+	 * If user has a valid IP address or host, return false to disable password protection.
 	 *
-	 * @param   boolean  $bool  Allow IP addresses.
-	 * @return  boolean         True/false.
+	 * @param   boolean  $bool  Allow IP addresses or hostnames.
+	 * @return  boolean
 	 */
 	function allow_ip_addresses( $bool ) {
 
 		$ip_addresses = $this->get_allowed_ip_addresses();
+		$hosts = array_map( 'gethostbyname', $ip_addresses );
 
-		if ( in_array( $_SERVER['REMOTE_ADDR'], $ip_addresses ) ) {
+		if ( in_array( $_SERVER['REMOTE_ADDR'], $ip_addresses ) || in_array( $_SERVER['REMOTE_ADDR'], $hosts ) ) {
 			$bool = false;
 		}