name, err := os.Hostname()
if err != nil {
     fmt.Printf("Oops: %vn", err)
     return
}

addrs, err := net.LookupHost(name)
if err != nil {
    fmt.Printf("Oops: %vn", err)
    return
}

for _, a := range addrs {
    fmt.Println(a)
}

ifaces, err := net.Interfaces()
// handle err
for _, i := range ifaces {
    addrs, err := i.Addrs()
    // handle err
    for _, addr := range addrs {
        switch v := addr.(type) {
        case *net.IPAddr:
            // process IP address
        }

    }
}

host, _ := os.Hostname()
addrs, _ := net.LookupIP(host)
for _, addr := range addrs {
    if ipv4 := addr.To4(); ipv4 != nil {
        fmt.Println("IPv4: ", ipv4)
    }
}