IPv4 CIDR Calculator

Validate and analyze an IPv4 network address block expressed in Classless Inter-Domain Routing (CIDR) notation.

!cidr4 examines IPv4 network prefixes, determines network and broadcast addresses, calculates usable host ranges, and interprets subnet boundaries. This command is designed for analyzing IPv4 network blocks in routing, subnetting, address planning, and diagnostics.

IPv4 CIDR notation expresses a network prefix using dotted-decimal IPv4 syntax followed by a slash and a prefix length. This command provides detailed information about prefix size, total addresses, usable hosts, mask representation, and related IPv4 subnet metadata.

Usage:
!cidr4 <ipv4-prefix>

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

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

  
                           
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