The following file is used with the ISC DHCP Server version 3. The file is located in /etc/dhcpd.conf:

ddns-updates on;
ddns-domainname "quenya.org";
option ntp-servers 192.168.1.2;
ddns-update-style ad-hoc;
allow unknown-clients;
default-lease-time 86400;
max-lease-time 172800;

option domain-name "quenya.org";
option domain-name-servers 192.168.1.2;
option netbios-name-servers 192.168.1.2;
option netbios-dd-server 192.168.1.2;
option netbios-node-type 8;

subnet 192.168.1.0 netmask 255.255.255.0 {
	range dynamic-bootp 192.168.1.60 192.168.1.254;
	option subnet-mask 255.255.255.0;
	option routers 192.168.1.2;
	allow unknown-clients;
}

In this example, IP addresses between 192.168.1.1 and 192.168.1.59 are reserved for fixed-address (commonly called hard-wired) IP addresses. The addresses between 192.168.1.60 and 192.168.1.254 are allocated for dynamic use.