Reference calculations that run entirely in the browser. Nothing is sent anywhere, so they work offline and on an air-gapped machine.
Expand and compress addresses, derive prefixes, count /64s, and build an EUI-64 identifier from a MAC.
IPv4 in dotted binary, hexadecimal and decimal, with the prefix boundary marked.
Collapse a list of prefixes into the smallest equivalent set, or summarise into one route.
Transfer time with protocol overhead, and the bandwidth-delay product that caps TCP throughput.
Stack encapsulation overheads to find the effective path MTU and the TCP MSS to clamp to.
Budget switch power against device draw, accounting for cable loss between PSE and PD.
Optical power budget, per-element losses and the maximum run that still closes with margin.
Free-space path loss, EIRP, fade margin and the Fresnel clearance a link needs to behave.
IPv4 network, broadcast, usable range and mask, plus block sizing for a host count.
Every figure here is computed from first principles rather than looked up in a table, and the underlying functions are covered by tests — including the edge cases that usually go wrong, like /31 point-to-point links, IPv6 zero-run compression, and decimal versus binary size units.