netaddr: 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/netaddr - from package: python-netaddr

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

On Debian possible default full paths are:

/usr/bin/netaddr - from package: python-netaddr

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

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