Navigate to https://centscdn-1b118.web.app/103

From the Dashboard > DNS > Click on "Traffic Director"

The IP Filter should be disabled for the default rule. You will receive an error message if you try to set up a specific region, country, city, or ASN (Autonomous System Network). As a result, the default rule is for worldwide access. The rule shows IP Filter: World(Default), Which means the rule is created for worldwide access. The users will be directed to the specified IP/Hostname in this rule.

Now you can create another rule for the same record to direct traffic for specific regions, countries, cities, ASN (Autonomous System Network) of the resolving name server, /24 IPv4 EDNS client subnet, and /120 IPv6 EDNS client subnet. Click here to add a new rule. 

Name: Create a unique, easy-to-identify name for your filter.

Drop Query for selected IP Filter: Enable this option if you want to return no answer when matching IP Filter.

Filter by Geographical Location: Filtering by location lets you choose a region, state, or city for your rule. You can select the regions and click the Add Region.

Filter by ASN: This option allows you to create a rule based on an ASN. Enter the ASN you wish to filter and then click the ASN button.  Repeat until you have entered all ASNs that apply to this specific rule.

Filter by IPv4 Address: Enter the IP or subnet (in CIDR notation) v4/netmask if you are filtering by IP and then click on the Add IPV4 button to add the IP to  Rules.

Filter by IPv6 Address: Enter the IPv6/netmask if you are filtering by IP and then click on the Add IPV6 button to add the IP to Rules.

We have configured the IP Filter, now you can select the appropriate Rule Mode and specify the IP address/Hostname that you want to direct traffic for the filter option. The answer will be delivered from the specified IP/Hostname If the filter options are matched.

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IP Filters are rules you can apply to your records that if a user meets the requirement(s) of the filter, they will be answered with that record. Otherwise, they will be answered with the World/Default. Filters can be created for: regions, countries, cities, ASN (Autonomous System Network) of the resolving name server, /24 IPv4 EDNS client subnet, and /120 IPv6 EDNS client subnet.
The IP Filter is Available for A, AAAA, CNAME, and ANAME records.

What is IP Filter and how to create rules?