Definition - What does Variable Length Subnet Mask (VLSM) mean?
A Variable Length Subnet Mask (VLSM) is a numerical masking sequence, or IP address subset, based on overall network requirements. A VLSM allows a network administrator to use long masks for networks with few hosts and short masks for networks with multiple hosts. A VLSM is used with a VLSM router and must have routing protocol support.
A VLSM is also known as a classless Internet Protocol (IP) address.
Free Download: IP Address Tracker
Eliminate IP conflicts by scanning, tracking, and managing up to 254 IP addresses. Detect IP conflicts and other problems using integrated monitoring and alerting. Fix problems faster with detailed logs and histories