patoh

Consistently open and interact Google maps while connected to the network in question. Google reports back the GPS/Neighbouring wifi AP's location, from that IP address. This is likely how they identified the IP was incorrectly in Central American in the first place

That along with reporting the incorrect geoip data to google should clear it up over time. However I have seen this take from 1 week to 2 months to improve. The more users / devices using Google maps, the better chance you will have with Google auto correcting the location.

AdGuard Pro can do DNS blocking on iOS. The default AdGuard server selection will block tracking requests.

If you only want to block malware, or other more serious badness, you can opt for others servers such as Quad9 or OpenDNS .

Edit: AdGuard is also (partially?) opensource - https://github.com/AdguardTeam

OpenLDAP-LTB provides up-to-date openldap packages for CentOS - http://ltb-project.org/documentation/openldap-rpm

openldap upstream suggest using these on CentOS / RHEL over the redhat packages, if operating the server components.

Werner Koch goes into further detail at the start of the gnupg-users thread @ https://lists.gnupg.org/pipermail/gnupg-users/2018-May/06031...