lib/gtmDnsProvider.js
function getFirstAvailableAddress() {
        let highestLastOctet = 0;
        usedAddresses.forEach((address) => {
            const octets = address.split('.');
            const thisLastOctet = parseInt(octets[3], 10);
            if (thisLastOctet > highestLastOctet) {
                highestLastOctet = thisLastOctet;
            }
        });
        highestLastOctet += 1;
        if (highestLastOctet > 255) {
            this.logger.error('No available addresses for GTM server');
            return null;
        }
        return `192.0.2.${highestLastOctet}`;
    }
function getFirstAvailableAddress() {
        let highestLastOctet = 0;
        usedAddresses.forEach((address) => {
            const octets = address.split('.');
            const thisLastOctet = parseInt(octets[3], 10);
            if (thisLastOctet > highestLastOctet) {
                highestLastOctet = thisLastOctet;
            }
        });
        highestLastOctet += 1;
        if (highestLastOctet > 255) {
            this.logger.error('No available addresses for GTM server');
            return null;
        }
        return `192.0.2.${highestLastOctet}`;
    }
when creating the server, we have to give it an IP address we use 192.0.2.X as that is defined in https://tools.ietf.org/html/rfc5737 for use as a documentation server and is not likely to be in use