NetLoom: Subnet & CIDR Calc

NetLoom is a fast, fully offline calculator for network administrators, developers, and students working with IPv4 and IPv6 addresses. Type an address or CIDR block to instantly see the network range, subnet mask, wildcard mask, usable host range, and hex/binary/decimal representations — no internet connection required and nothing ever leaves your device. Paste a whole list of addresses, CIDR blocks, or ranges at once and NetLoom classifies and summarizes every line in one pass, including turning an arbitrary IP range into the minimal set of CIDR blocks that covers it — a shortcut most single-address calculators don't offer. Save calculations to a running history for quick recall, and export batch results as CSV to share with your team. Included: • Single-tap IPv4 & IPv6 address and CIDR breakdown • Batch processing for pasted lists of addresses, CIDR blocks, and ranges • Range-to-CIDR aggregation (minimal covering block set) • Full IANA special-use classification (private, loopback, link-local, CGNAT, documentation, and more) • Saved calculation history • CSV export and native share sheet NetLoom never asks for an account, never phones home, and works completely offline — your addresses and subnets stay on your device.