fdnsiplist: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/fdnsiplist - from package: firedns

You may install the required package with command apt-get install {package}

Error in other languages:
fdnsiplist: bevel nie gevind nie
fdnsiplist: comandă negăsită
fdnsiplist: comando não encontrado
fdnsiplist: commande introuvable
fdnsiplist: command not found
fdnsiplist: käsku ei ole
fdnsiplist: không tìm thấy lệnh
fdnsiplist: komanda nerasta
fdnsiplist: Kommando nicht gefunden.
fdnsiplist: kommandot finns inte
fdnsiplist: komut yok
fdnsiplist: nie znaleziono polecenia
fdnsiplist: níor aimsíodh an t-ordú
fdnsiplist: no se encontró la orden
fdnsiplist: no s'ha trobat l'ordre
fdnsiplist: opdracht niet gevonden
fdnsiplist: parancs nem található
fdnsiplist: perintah tidak ditemukan
fdnsiplist: príkaz nenájdený
fdnsiplist: příkaz nenalezen
fdnsiplist: команда не найдена
fdnsiplist: командата не е открита
fdnsiplist: 命令找不到
fdnsiplist: コマンドが見つかりません