dnsipq: 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/dnsipq - from package: ndjbdns

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

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