@Nullable
    public static Inet4Address defaultNonLoopbackIpV4Address() {
        return DefaultNonLoopbackIPv4Address.defaultNonLoopbackIpV4Address;
    }
Returns the non-loopback {@link Inet4Address} whose {@link NetworkInterface#getIndex()} is the lowest.

@see Flags#preferredIpV4Addresses()
core/src/main/java/com/linecorp/armeria/common/util/SystemInfo.java