Use !cidr4 to validate and analyze an IPv4 network address block expressed in Classless Inter-Domain Routing (CIDR) notation.

IPv4 CIDR notation represents a network prefix using a dotted-decimal IPv4 address followed by a slash and a prefix length. CIDR is widely used for subnetting, Internet routing, route aggregation, network planning, address management, and documentation.

!cidr4 examines IPv4 prefixes and determines network boundaries, subnet masks, network addresses, broadcast addresses, address ranges, and other subnet metadata associated with the specified IPv4 prefix.

The command accepts both conventional CIDR prefix lengths and subnet masks. Host addresses supplied within a subnet are automatically interpreted within the context of the specified network mask.

Results may include the normalized network prefix, total address count, usable host count, first usable address, last usable address, network address, broadcast address, and other IPv4 subnet calculations useful for operational and administrative purposes.

Usually, you do not need to prefix your query with !cidr or !cidr4

Usage:
<ipv4-prefix>
!cidr4 <ipv4-prefix>

Usage Examples:
192.0.2.0/19
69.171.240.0/20
74.125.38.0/23
10.10.10.8/8
0.0.0.0/0
0.0.0.1/0
1.0.0.0/0
4.3.2.1/0
!cidr 225.34.3.2/21
!cidr 128.3.2.1/32
!cidr4 2.4.8.16/32
!cidr4 192.168.1.23/255.255.255.0
!cidr4 172.16.0.0/255.240.0.0
!cidr 1.1.1.1/255.0.0.0
!cidr 10.0.0.0/8
!cidr 28.27.26.25/24
0.0.0.1/8
0.0.0.0/8
10.0.0.0/8
12.11.10.9/8
100.64.0.0/10
127.0.0.0/8
169.254.0.0/16
172.16.0.0/12
192.0.0.0/24
192.0.2.0/24
192.88.99.0/24
192.168.0.0/16
198.18.0.0/15
198.51.100.0/24
203.0.113.0/24
224.0.0.0/4
233.252.0.0/24
240.0.0.0/4
255.255.255.255/32
8.8.8.0/24
8.8.8.8/32
9.9.9.0/24
11.10.9.0/8
14.0.0.1/8
15.0.0.15/8
19.0.0.0/8
22.22.22.22/8
25.0.0.52/8
26.0.0.0/8
28.0.0.0/8
29.0.0.0/8
30.0.0.0/8
55.0.0.0/8
56.0.0.0/8
214.0.0.0/8
215.0.0.0/8
216.0.0.0/8
6.5.4.3/8
7.7.7.7/8
21.0.0.0/8
53.0.0.0/8
214.0.0.0/7


See also:
!help cidr