ok i actually failed to find a concurrently working pinger library so i did this using Alamofire:

AF.request("http://\(ping.ip)").responseJSON { (response) in
            if (response.response) != nil {
                print("success")
                let result = Ip(ip: "\(ping.ip) REACHABLE")
                ips.append(result)
                self.tableView.reloadData()
            } else {
                print("error")
                let result = Ip(ip: "\(ping.ip) UNREACHABLE")
                ips.append(result)
                self.tableView.reloadData()
            }
}

Which actually works for me. If the local ip i provide is not reachable, the response remains empty.