Looks like no:
bool CMasternode::IsValidNetAddr(CService addrIn)
{
// TODO: regtest is fine with any addresses for now,
// should probably be a bit smarter if one day we start to implement tests for this
return Params().NetworkIDString() == CBaseChainParams::REGTEST ||
(addrIn.IsIPv4() && IsReachable(addrIn) && addrIn.IsRoutable());
}
Any chance to see that support close? That may become critical since last pool of IPv4 was recently dispatched.