iprange: 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 CentOS possible default full paths are:

/usr/bin/iprange - from package: haproxy

You may install the required package with command yum install {package}

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