Simple funtion which can generate valid ip4 address from a simple int.

generateIpFromInt.cpp

#include <QDebug>

QString generateIpFromInteger(quint32 ip)
{
	QString ipString;

	for (int i = 0; i < 4; ++i) {
		ipString.insert(0, QString::number(ip & 0xff));

		if (i < 3) {
			ipString.insert(0, '.');
		}

		ip >>= 8;
	}

	return ipString;
}

int main()
{
	for(int i = 0; i < 1000; ++i) {
		qDebug() << generateIpFromInteger(i);
	}

	return 0;
}