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Wildcard Mask Calculator

Wildcard Mask Calculator is part of Toolspire and is ready as soon as this page loads. The wildcard is what an ACL uses where a subnet mask would have the opposite bits. /32 is wildcard 0.0.0.0. /0 is wildcard 255.255.255.255.

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What you can do here

Both masks

The headline is the wildcard. The detail is the subnet mask people already know.

/26 is the check

The last six bits are host bits, and 2^6 − 1 is 63.

Not a full subnet plan

Network and broadcast addresses need an IP as well. The subnet calculator takes that.

The sequence

How to use the Wildcard Mask Calculator

  1. 1

    Type the prefix length

    26 is the sample.

  2. 2

    Read 0.0.0.63

    That is the wildcard.

  3. 3

    Use the subnet calculator for a specific network

    This page has no IP address box.

Worth knowing

  • Wildcard Mask Calculator on Toolspire: /26 has subnet mask 255.255.255.192 and wildcard 0.0.0.63.
  • The wildcard is the bitwise NOT of the mask, on 32 bits.
  • /32 is mask 255.255.255.255 and wildcard 0.0.0.0. One address.
  • /0 is mask 0.0.0.0 and wildcard 255.255.255.255. Every address.

Host bits become the wildcard

A /26 prefix fixes the first 26 bits and leaves 6 bits for the host. The subnet mask has those 26 bits set: 255.255.255.192. The wildcard used in many ACLs sets the other bits: the 6 host bits, which is 63 in the last octet, 0.0.0.63. Flipping every bit of the mask is the whole conversion. It does not compute a network address, because no IP was given.

FAQ

Questions about Wildcard Mask Calculator

Where does Wildcard Mask Calculator run?

Wildcard Mask Calculator runs in this tab on Toolspire. What you type or drop in is not sent to us and is not stored on a server.

What is the wildcard for /26?

0.0.0.63. The subnet mask is 255.255.255.192.

What is /32?

Wildcard 0.0.0.0. The mask is all ones.

What is /0?

Wildcard 255.255.255.255. The mask is all zeros.

Does this need an IP address?

No. The prefix alone fixes both masks.

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