GeoContinent App

A DNS App for Technitium DNS Server that returns continent-specific answers based on the client's geolocation continent.

Overview

• APP-record driven – no root-level dnsApp.config
• Continent mapping – APP record JSON maps continent codes to response data
• Default fallback – optional default entry when no continent match exists

Integration / extension points

• Implements: IDnsApplication, IDnsAppRecordRequestHandler
• Runs as an APP-record request handler.

Configuration

dnsApp.config is not used by this app.

MaxMind database requirement

This app depends on the geolocation database to determine the client's continent.

A MaxMind GeoIP2/GeoLite2 Country database in .mmdb format must be installed. The app includes the GeoLite2 version for trial. For production usage, it is required that you purchase the GeoIP2 database from MaxMind (https://www.maxmind.com/).

• Required: a GeoIP2/GeoLite2 Country database file (*.mmdb)
• Optional: GeoIP2/GeoLite2 ISP and/or GeoIP2/GeoLite2 ASN database files (*.mmdb)

If the Country database is missing, this app cannot resolve the client continent and the app will throw errors instead of answering requests successfully.

Installation

1. Open the Technitium DNS Server web console
2. Navigate to Apps section
3. Click App Store and find the Geo Continent App to install
4. Configure APP records in the appropriate DNS zone(s)

Maxmind Database Update Procedure

1. Obtain a MaxMind GeoIP2 Country or GeoLite2 Country .mmdb database from MaxMind.
2. Zip the .mmdb file without renaming it.
3. Open the Technitium DNS Server web console
4. Navigate to Apps section
5. Find the Geo Continent app in the list of installed apps
6. Click on the Update button for the app and upload the zip file to complete the database update process.

Keep the database updated on a regular schedule by downloading the latest MaxMind release and updating it for the app.

Optional ISP / ASN databases

The GeoContinent app only requires the Country database to map clients to continents. However, you may also install and maintain:

• GeoIP2/GeoLite2 ISP
• GeoIP2/GeoLite2 ASN

These optional databases are not required for continent-based responses in this app, but they are useful for the Autonomous System Number (ASN) based mapping feature and for selecting optimal EDNS Client Subnet scope prefix length value.

APP record JSON

{
  "EU": { },
  "NA": { },
  "AS1234": { },
  "default": { }
}

The important part is the continent-key mapping. The exact payload format is interpreted by the app/runtime.

Runtime behavior

1. The app determines the client continent from geolocation.
2. It looks up the continent key in the APP record JSON.
3. If no match exists, it uses default when available.

Risks / operational notes

• Geolocation can be inaccurate or unavailable for some clients.
• If default is missing, unmatched clients may receive no app-specific answer.

Troubleshooting

• Verify the APP record contains valid JSON.
• Add a default entry if you need a fallback response.
• If lookups are missing or stale, update the GeoIP database files used by the DNS server.