Wildcard Mask Calculator

v1.0

Convert between subnet masks and wildcard masks with ease.

Convert Subnet Mask to Wildcard Mask

Subnet Mask

. . .

CIDR Prefix

/

Results

Wildcard Mask

0.0.0.255

CIDR Notation

/24

Binary Representation

Subnet Mask:

11111111.11111111.11111111.00000000

Wildcard Mask:

00000000.00000000.00000000.11111111

Wildcard Mask Usage

Wildcard masks are used in Cisco ACLs and route filtering. They specify which bits to ignore when comparing IP addresses.

Example ACL: access-list 1 permit 192.168.1.0 0.0.0.255

Convert Wildcard Mask to Subnet Mask

Wildcard Mask

. . .

Results

Subnet Mask

255.255.255.0

CIDR Notation

/24

Binary Representation

Wildcard Mask:

00000000.00000000.00000000.11111111

Subnet Mask:

11111111.11111111.11111111.00000000

Subnet Mask Usage

Subnet masks are used to determine which portion of an IP address refers to the network address and which portion refers to the host address.

Example: IP: 192.168.1.10, Subnet: 255.255.255.0 means the network is 192.168.1.0

Binary Mask Editor

Click on the bits below to toggle between 1 and 0. The subnet and wildcard masks will update automatically.

11111111.11111111.11111111.00000000

CIDR Prefix

/24

Subnet Mask

255.255.255.0

Wildcard Mask

0.0.0.255

ACL Wildcard Mask Helper

Generate wildcard masks for Cisco ACLs based on IP ranges or specific requirements.

IP Address

. . .

ACL Type

Subnet Mask / CIDR

. . . or /

Wildcard Mask Calculator

Convert Subnet Mask to Wildcard Mask

Results

Wildcard Mask

CIDR Notation

Binary Representation

Wildcard Mask Usage

Convert Wildcard Mask to Subnet Mask

Results

Subnet Mask

CIDR Notation

Binary Representation

Subnet Mask Usage

Binary Mask Editor

CIDR Prefix

Subnet Mask

Wildcard Mask

ACL Wildcard Mask Helper

ACL Syntax

Standard ACL

Extended ACL

Named ACL

Wildcard Mask Information