IP range

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Hi all

Can someone explain me this:

ifcfg-eth0-range1:
ONBOOT="yes"
IPADDR_START="192.168.1.48"
IPADDR_END="192.168.1.55"
CLONENUM_START="1"

Why Bcast is 192.168.1.51 and why Mask is 255.255.255.252 ?

OS: Centos 6.3/64bit


Thanks

Levi

# ifconfig

eth0:1    Link encap:Ethernet  HWaddr 00:9C:02:99:FA:00
           inet addr:192.168.1.48  Bcast:192.168.1.51  Mask:255.255.255.252
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           Interrupt:16 Memory:fbee0000-fbf00000

eth0:2    Link encap:Ethernet  HWaddr 00:9C:02:99:FA:00
           inet addr:192.168.1.49  Bcast:192.168.1.51  Mask:255.255.255.252
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           Interrupt:16 Memory:fbee0000-fbf00000

eth0:3    Link encap:Ethernet  HWaddr 00:9C:02:99:FA:00
           inet addr:192.168.1.50  Bcast:192.168.1.51  Mask:255.255.255.252
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           Interrupt:16 Memory:fbee0000-fbf00000

eth0:4    Link encap:Ethernet  HWaddr 00:9C:02:99:FA:00
           inet addr:192.168.1.51  Bcast:192.168.1.51  Mask:255.255.255.252
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           Interrupt:16 Memory:fbee0000-fbf00000

eth0:5    Link encap:Ethernet  HWaddr 00:9C:02:99:FA:00
           inet addr:192.168.1.52  Bcast:192.168.1.51  Mask:255.255.255.252
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           Interrupt:16 Memory:fbee0000-fbf00000

eth0:6    Link encap:Ethernet  HWaddr 00:9C:02:99:FA:00
           inet addr:192.168.1.53  Bcast:192.168.1.51  Mask:255.255.255.252
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           Interrupt:16 Memory:fbee0000-fbf00000

eth0:7    Link encap:Ethernet  HWaddr 00:9C:02:99:FA:00
           inet addr:192.168.1.54  Bcast:192.168.1.51  Mask:255.255.255.252
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           Interrupt:16 Memory:fbee0000-fbf00000

eth0:8    Link encap:Ethernet  HWaddr 00:9C:02:99:FA:00
           inet addr:192.168.1.55  Bcast:192.168.1.51  Mask:255.255.255.252
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           Interrupt:16 Memory:fbee0000-fbf00000



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