Adds user agent information to the entry admin screen for Gravity Forms

gf_user_agent.php

<?php
add_action( 'gform_entry_info', 'djb_gform_entry_info', 10, 2 );
function djb_gform_entry_info( $form, $lead ) {
// Show IP info link if address is IPv4 and not in private or reserved range
	if ( isset( $lead['ip'] ) && filter_var( $lead['ip'], FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE ) ) {
		$ip_info_url = 'http://' . $lead['ip'] . '.ipaddress.com';
		echo '<a href="' . esc_url( $ip_info_url ) . '" target="_blank">IP info</a>';
	}
	if ( isset( $lead['ip'] ) && isset( $lead['user_agent'] ) ) {
		echo '<br><br>';
	}
	if ( isset( $lead['user_agent'] ) ) {
		_e( 'User Agent', 'gravityforms' );
		echo ': ' . esc_html( $lead['user_agent'] );
	}
}