in code/include/swoc/swoc_ip_util.h [40:46]
inline bool is_private_host_order(in_addr_t addr) {
return (((addr & 0xFF000000) == 0x0A000000) || // 10.0.0.0/8
((addr & 0xFFC00000) == 0x64400000) || // 100.64.0.0/10
((addr & 0xFFF00000) == 0xAC100000) || // 172.16.0.0/12
((addr & 0xFFFF0000) == 0xC0A80000) // 192.168.0.0/16
);
}