well my experience with routers is limited to changing my password.

but i think u are referring to LAN > LAN Settings starting and ending pool addresses. if so its 2-100.
also i found a whole page of attacks on this router,in Firewall > Security log.
Internet connection fail => Sun Jan 16 00:41:12 2011
Sun Jan 16 15:54:19 2011
=>Found attack from 192.168.254.254.