Package: xinetd

"xinetd" package binaries on CentOS:

/usr/sbin/xinetd

You may install this package on CentOS with yum install xinetd

"xinetd" package binaries on Debian:

/usr/sbin/itox /usr/sbin/xconv.pl /usr/sbin/xinetd

You may install this package on Debian with apt-get install xinetd