ipcount: 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/ipcount - from package: perl-Net-IP

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

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