A range of IP addresses specified by an IP
address/IP network mask pair. For example,
class B address range of X.X.X.X with a network
mask of 255.255.0.0 includes all IP addresses
from X.X.0.0 to X.X.255.255. Note that if
ranges are range configured such that one range
subsumes another range (e.g., 10.0.0.0 mask
255.0.0.0 and 10.1.0.0 mask 255.255.0.0), the
most specific match is the preferred one.