how to limit registration in my laravel app?

hello i have a laravel app with registration form now anyone can register multi accounts what i want is to limit registration for 1 account per ip any one can give me an idea for that ?? here is my registration form if there is a quick solution please tell me and also i want users to use only gmail

            <h4>  </h4><span class="liner"></span>

            <div class="row">
                <div class="col-md-6 col-md-offset-2 col-sm-12">
                    <h4> Registration </h4><span class="liner"></span>
                    <div class="widget-content clearfix">
                        <form action="" method="post" class="form-horizontal" enctype="multipart/form-data">
                            {!! csrf_field() !!}
                            <div class="form-group">
                                <label for="inputEmail3" class="col-sm-3 control-label">Member Plan</label>
                                <div class="col-sm-8">
                                    <select name="price_id" id="" class="form-control" required>
                                        @foreach($price as $p)
                                            @if($p->id == $pr)
                                            <option value="" selected> -  </option>
                                            @else
                                                <option value=""> -  </option>
                                            @endif
                                        @endforeach
                                    </select>
                                </div>
                            </div>
                            <div class="form-group">
                                <label for="inputEmail3" class="col-sm-3 control-label">Name</label>
                                <div class="col-sm-8">
                                    <input type="text" name="name" class="form-control" id="inputEmail3" placeholder="Name" required>
                                </div>
                            </div>
                            <div class="form-group">
                                <label for="inputEmail3" class="col-sm-3 control-label">Email</label>
                                <div class="col-sm-8">
                                    <input type="email" name="email" class="form-control" id="inputEmail3" placeholder="Email" required>
                                </div>
                            </div>
                            <div class="form-group">
                                <label for="inputEmail3" class="col-sm-3 control-label">Phone</label>
                                <div class="col-sm-8">
                                    <input type="text" name="phone" required class="form-control" id="inputEmail3" placeholder="Phone">
                                </div>
                            </div>
                            <div class="form-group">
                                <label for="inputEmail3" class="col-sm-3 control-label">Address</label>
                                <div class="col-sm-8">
                                    <textarea name="address" id="" cols="30" rows="3"
                                              class="form-control" required></textarea>
                                </div>
                            </div>
                            <div class="form-group">
                                <label for="inputEmail3" class="col-sm-3 control-label">Profile Picture</label>
                                <div class="col-sm-8">
                                    <input type="file" name="image" id="" required class="form-control">
                                </div>
                            </div>
                            <div class="form-group">
                                <label for="inputPassword3" class="col-sm-3 control-label">Password</label>
                                <div class="col-sm-8">
                                    <input type="password" required name="password" class="form-control" id="inputPassword3" placeholder="Password">
                                </div>
                            </div>
                            <div class="form-group">
                                <label for="inputPassword3" class="col-sm-3 control-label">Confirm Password</label>
                                <div class="col-sm-8">
                                    <input type="password" required name="password_confirmation" class="form-control" id="inputPassword3" placeholder="Password">
                                </div>
                            </div>
                            <div class="form-group">
                                <div class="col-sm-offset-3 col-sm-8">
                                    <button type="submit" class="btn btn-default"><i class="fa fa-send"></i> Registration</button>
                                </div>
                            </div>
                        </form>

via Chebli Mohamed