TechnitiumSoftware-DnsServer/Apps/SplitHorizonApp/dnsApp.config

{
    "networks": {
        "custom-networks": [
            "172.16.1.0/24",
            "172.16.10.0/24",
            "172.16.2.1"
        ]
    },
    "enableAddressTranslation": false,
    "networkGroupMap": {
        "10.0.0.0/8": "local1",
        "172.16.0.0/12": "local2",
        "192.168.0.0/16": "local3"
    },
    "groups": [
        {
            "name": "local1",
            "enabled": true,
            "translateReverseLookups": true,
            "externalToInternalTranslation": {
               "1.2.3.4": "10.0.0.4",
               "5.6.7.8": "10.0.0.5"
            }
        },
        {
            "name": "local2",
            "enabled": true,
            "translateReverseLookups": true,
            "externalToInternalTranslation": {
               "1.2.3.4": "172.16.0.4",
               "5.6.7.8": "172.16.0.5"
            }
        },
        {
            "name": "local3",
            "enabled": true,
            "translateReverseLookups": true,
            "externalToInternalTranslation": {
               "1.2.3.4": "192.168.0.4",
               "5.6.7.8": "192.168.0.5"
            }
        }
    ]
}