Simple bash function to find all active IP address, their MAC address, and the adapter manufacturer.

ips.sh

cmd_exists() {
    command -v "$1" &> /dev/null
}

ips(){
    local usage="ips [%NETWORK_BASE_IP%] [%BIT_DEPTH%] [ip-only | no-sudo]"$'\n'"Default IP: 192.168.1.0"$'\n'"Default Mask: 24"
    local addr="$1";
    local mask="$2";
    local prefix="";
    local suffix="";

    # Ensure nmap is installed
    if ! cmd_exists "nmap"; then
        printf "nmap is required, please install it!\n"
        exit 1
    fi

    # display help if needed
    if [[ "$@" =~ "help" ]]; then
      echo "$usage";
      return 0;
    fi

    # filter out details if only ips are needed
    if [[ "$@" =~ "ip-only" ]]; then
      suffix=" | grep report | awk '{print \$5}'";
    fi

    # remove sudo if is to be run without it
    if [[ "$@" =~ "no-sudo" ]]; then
      prefix="";
    else
      prefix="sudo ";
    fi

    # ensure the subnet mask is between 4 and 30 bits (default to 24)
    if [[ "$mask" =~ ^[0-9]+$ ]] && [ "$mask" -ge 4 -a "$mask" -le 30 ]; then
      mask="$mask";
    else
      echo "Invalid mask supplied.  Defaulting to 24 bits."
      mask="24";
    fi

    # proceed if the first value is a valid IP address
    if [[ ! $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
      echo "Invalid IP address supplied.  Defaulting to 192.168.1.0."
      addr="192.168.1.0";
    fi

    eval "${prefix}nmap $addr/$mask -n -sP${suffix}"
}