Online Subnet Mask Calculator - IP Address Calculation & Base Conversion Tool

TCP/IP Subnet Mask Calculator & Conversion

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Operating Instructions

Online subnet mask calculator, supporting IP address base conversion, mask conversion, and network address calculation.

Network and IP Address Calculator

IP/Mask bits: . . . /
Available addresses:
Mask:...
Network:...
First usable:...
Last usable:...
Broadcast:...
Displays network, broadcast, first and last given network addresses. Mask bit format is CIDR format.

Subnet Mask Converter (to dotted decimal format)

. . . Result:

Subnet Mask Converter (from bit count to dotted decimal)

Mask bits:
Decimal:...
Hexadecimal:...

Required Number of Addresses to Mask Converter

Number of addresses needed:
Mask:dotted dec.
Mask:...
Available count:

IP Address Decimal to Binary and Hexadecimal Conversion

. . .
Binary:...
Hexadecimal:...

Hexadecimal Mask to Dotted Decimal IP Address Conversion

Dotted decimal:...
Binary:...

Calculate Bitwise Complement of an IP Address (Inverse)

. . .
. . .

Mask to Network Usable Address Count

Mask bits:
Number of usable addresses:
Total addresses:
Dotted decimal format:...
Note: Advanced modules such as "Network and IP Address Calculator" (second) and "TCP/IP Base Converter" below the website involve complex interactions and are not included in this version.