How to calculate Broadcast Address(IPv4) with net/netip

main.go

package main

import (
	"encoding/binary"
	"fmt"
	"net/netip"
)

func BAddr(s string) (netip.Addr, error) {
	p, err := netip.ParsePrefix(s)
	if err != nil {
		return netip.Addr{}, err
	}

	a4 := p.Masked().Addr().As4()
	binary.LittleEndian.PutUint32(a4[:], binary.LittleEndian.Uint32(a4[:])|1<<(31-p.Bits()))
	return netip.AddrFrom4(a4).Prev(), nil
}

func main() {
	s := "192.168.1.1/24"
	fmt.Println(s)
	fmt.Println(BAddr(s))
}