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IPv4/CIDRMax. HostsNetmask
x.x.x.x/321255.255.255.255
x.x.x.x/312255.255.255.254
x.x.x.x/304255.255.255.252
x.x.x.x/298255.255.255.248
x.x.x.x/2816255.255.255.240
x.x.x.x/2732255.255.255.224
x.x.x.x/2664255.255.255.192
x.x.x.x/25128255.255.255.128
x.x.x.x/24256255.255.255.000
x.x.x.x/23512255.255.254.000
x.x.x.x/221024255.255.252.000
x.x.x.x/212048255.255.248.000
x.x.x.x/204096255.255.240.000
x.x.x.x/198192255.255.224.000
x.x.x.x/1816 384255.255.192.000
x.x.x.x/1732 768255.255.128.000
x.x.x.x/1665 536255.255.000.000
x.x.x.x/15131 072255.254.000.000
x.x.x.x/14262 144255.252.000.000
x.x.x.x/13524 288255.248.000.000
x.x.x.x/121 048 576255.240.000.000
x.x.x.x/112 097 152255.224.000.000
x.x.x.x/104 194 304255.192.000.000
x.x.x.x/98 388 608255.128.000.000
x.x.x.x/816 777 216255.000.000.000
x.x.x.x/733 554 432254.000.000.000
x.x.x.x/667 108 864252.000.000.000
x.x.x.x/5134 217 728248.000.000.000
x.x.x.x/4268 435 456240.000.000.000
x.x.x.x/3536 870 912224.000.000.000
x.x.x.x/21 073 741 824192.000.000.000
x.x.x.x/12 147 483 648128.000.000.000
x.x.x.x/04 294 967 296000.000.000.000

IPv4/CIDR

Example

Network: <= 1.1.0.0/18
Example:
Network range
1.1.0.0-1.1.63.255
CIDR
Host address - 1.1.0.0
Host address (decimal) - 16842752
Host address (hex) - 1010000
Network address - 1.1.0.0
Network mask - 255.255.192.0
Network mask (bits) - 18
Network mask (hex) - FFFFC000
Broadcast address - 1.1.63.255
Cisco wildcard - 0.0.63.255
Addresses in network - 16384
Usable range - 1.1.0.1 - 1.1.63.254
Max. Hosts = 16382 (2^14 - 2)
Hosts Bits = 14
1.1.0.0 is a NETWORK address ( Class A)
GeoIP Country = China (CN)
GeoIP Region = Unknown, Unknown (35°N, 105°E)

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