Free Bulk Network Address Calculator — CIDR Subnet Analysis

Our free network address calculator processes multiple CIDR blocks simultaneously, calculating the network address, broadcast address, usable host range, total hosts and subnet mask for each one. Ideal for IP address management, firewall rule documentation and infrastructure planning.

How Subnet Calculations Work

Given an IP and prefix (e.g. 192.168.1.100/24): the network address is the IP ANDed with the subnet mask. The broadcast address is the network address ORed with the inverse of the mask. Usable hosts are all addresses between these two (exclusive), so a /24 gives 254 usable hosts from 256 total.

Common Subnet Sizes

• /30 — 2 usable hosts. Point-to-point links between routers.
• /29 — 6 usable hosts. Small server clusters.
• /27 — 30 usable hosts. Small office segments.
• /24 — 254 usable hosts. Standard LAN segment.
• /22 — 1,022 usable hosts. Large office or campus.
• /16 — 65,534 usable hosts. Large enterprise or cloud VPC.