Make IPv4 Subnetting Less Error‑Prone
Calculate network, broadcast, host range, and usable hosts from a CIDR or IP/mask quickly. It’s a lightweight helper for network planning, lab setups, and exam practice.
What You Can Check
- Network and broadcast addresses for a given CIDR.
- Wildcard mask and dotted‑decimal netmask equivalents.
- First and last usable host addresses and total host count.
Tips
- Remember that /31 and /32 have special semantics for point‑to‑point and hosts.
- Document subnets alongside VLANs to avoid overlap and confusion.