in_addr This crate exposes a common interface to in_addr between Unix and Windows. Get rid of these #[cfg]s! Features no-std: Compile this crate with no_std. Conversions to and from std::net::Ipv4Addr will not be available. Documentation cfg(windows): https://docs.rs/in_addr/*/x86_64-pc-windows-msvc/in_addr/ cfg(unix): https://docs.rs/in_addr/*/x86_64-unknown-linux-gnu/in_addr/