Network Size Considerations

The following table shows the address space associated with each address block prefix assignable using Classless Inter-Domain Routing (CIDR).

# of IP Addresses	Address Block Prefix
32	/27
64	/26
128	/25
256	/24
512	/23
1024	/22
2048	/21
4096	/20
8192	/19
16,384	/18
32,768	/17
65,536	/16
131,072	/15
262,144	/14
524,288	/13

Calculate the network parameters for a CIDR address.

Valid input for the calculator includes:
	address block prefix	/19
	subnet mask	255.255.255.192
	subnet mask (hex)	0xffffffc0
	wildcard bits	0.0.0.31
	IP address/address block prefix	192.168.10.56/26
	IP address/subnet mask	192.168.0.13/255.255.255.0
	IP address/subnet mask (hex)	192.168.0.13/0xffffff00
	IP address/wildcard bits	192.168.0.169/0.0.0.127

Omitting an IP address in the input will return:

1. address block prefix
2. subnet mask
3. subnet mask (hex)
4. wildcard bits
5. number of usable IP addresses

Including an IP address in the input will return the above values plus:

1. network address
2. broadcast address
3. first usable IP address
4. last usable IP address

Copyright © 2003 Andrew St. Jean	Last update Jul. 21, 2007