Specify the domain name server for reverse DNS lookup.
The filter hook “ip-location-block-dns” can replace the reverse DNS lookup service on your server if it is slow.
(array) An array of DNS lookup resolvers that can be primary and secondary name servers.
NOTE: When you select
"mu-plugins" (ip-location-block-mu.php)as Validation timing , you should put your code snippet into
drop-in.phpin Geolocation API folder instead of
functions.php. See My custom functions in “functions.php” doesn’t work. in FAQ for detail.