Check IP in CIDR

Check whether an IP address belongs to a CIDR network prefix.

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ToolIP in CIDR Checker
Input
Output
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Preview

How it works

Address and network become fixed-width bits; applying the mask to the address and comparing the prefix determines membership. IPv4 and IPv6 use separate widths and parsers.

  • Mask comparison answers containment, not host usability.
  • Prefix length defines the boundary independently of allocation policy.

Worked example

Check if 192.168.1.50 is in 192.168.1.0/24
Verify an IP address belongs to a /24 subnet and see network details
Input
											Input1: 192.168.1.50
Input2: 192.168.1.0/24
Output
												IP: 192.168.1.50
CIDR: 192.168.1.0/24
Is in range: yes
Network address: 192.168.1.0
Broadcast address: 192.168.1.255

When to use this

Firewalls, routers, and cloud security rules check subnet membership.

Edge cases

  • Network or broadcast addresses can be inside IPv4 CIDR but unusable.
  • IPv4 prefixes outside 0–32 are invalid.
  • IPv6 cannot be compared with an IPv4 mask.

References