IP Address Default Subnet Masks
The following table displays the three main IP address classes, along with their default masks in binary and decimal formats, respectively.
| Class | Default Mask in Binary | Default Mask in Decimal |
|---|---|---|
| A | 11111111.00000000.00000000.00000000 | 255.0.0.0 |
| B | 11111111.11111111.00000000.00000000 | 255.255.0.0 |
| C | 11111111.11111111.11111111.00000000 | 255.255.255.0 |
Get BSCI Exam Cram™ 2 (Exam 642-801) now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
