Juniper SECURITY THREAT RESPONSE MANAGER 2008.2 R2 - LOG MANAGEMENT ADMINISTRATION GUIDE REV 1 Administration Manual page 31

Table 3-2 Accepted CIDR Values (continued)
CIDR
Length Mask
/27 255.255.255.224
/28 255.255.255.240
/29 255.255.255.248
/30 255.255.255.252
/31 255.255.255.254
/32 255.255.255.255
For example, a network is called a supernet when the prefix boundary contains
fewer bits than the network's natural (such as, classful) mask. A network is called a
subnet when the prefix boundary contains more bits than the network's natural
mask:
209.60.128.0 is a class C network address with a natural mask of /24.
•
209.60.128.0 /22 is a supernet which yields:
•
209.60.128.0 /24
209.60.129.0 /24
209.60.130.0 /24
209.60.131.0 /24
192.0.0.0 /25
•
Subnet Host Range
0 192.0.0.1-192.0.0.126
1 192.0.0.129-192.0.0.254
192.0.0.0 /26
•
Subnet Host Range
0 192.0.0.1 - 192.0.0.62
1 192.0.0.65 - 192.0.0.126
2 192.0.0.129 - 192.0.0.190
3 192.0.0.193 - 192.0.0.254
192.0.0.0 /27
•
Subnet Host Range
0 192.0.0.1 - 192.0.0.30
1 192.0.0.33 - 192.0.0.62
2 192.0.0.65 - 192.0.0.94
3 192.0.0.97 - 192.0.0.126
4 192.0.0.129 - 192.0.0.158
STRM Log Management Administration Guide
Creating Your Network Hierarchy
Number of
Networks Hosts
8 subnets 30
16 subnets 14
32 subnets 6
64 subnets 2
none none
1/256 C 1
25