Subnet Splitter — Split a Network into Equal Subnets

1. Base Network

Enter the network you want to split. This is the same calculator as the IPv4 Calculator page — a compact copy lives here so the splitter works on its own.

IP Address (optionally with /CIDR)

Subnet Mask (if no /CIDR above)

2. Split It

Split into new prefix /

Split into N subnets:

Network	CIDR	Usable Range	Broadcast	Usable Hosts

Splitting one large network into smaller subnets reduces broadcast traffic, lets you apply different firewall/VLAN policy per segment, and avoids wasting address space on a department that only needs 10 hosts but was handed a /24 (254 usable addresses).

Every time the prefix grows by 1, the subnet size halves — so splitting a /24 into /26s gives you 4 equal subnets of 64 addresses each. If your subnets need to be different sizes (e.g. 50 hosts here, 10 there), use the VLSM Planner instead, which packs right-sized blocks efficiently. Full prefix reference: CIDR Cheat Sheet.