axfrdns: 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/sbin/axfrdns - from package: ndjbdns

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

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