Compute subnet masks, network/broadcast addresses, and usable host ranges from any CIDR. Plan a /24 office network correctly — local math, free, no signup.
Content reviewed October 2026 · About Toolzum
Convert CIDR prefixes to masks, ranges, and host counts — /8 through /32 decoded. Answer 'how many IPs in a /22' instantly — local math, free, no signup.
See any CIDR as binary maps — IP, mask, and network bits plus a 32-block network/host bar. Single-network rendering only, no sub-subnetting — local rendering, free, no signup.
Compute fluid clamp() type scales that flex between viewport sizes — no breakpoints needed. Set 16→20px body that just works — local math, free, no signup.
Compute turnover rate and retention with replacement-cost breakdown. Price a 20% churn problem correctly — free, local, no signup.
Convert between kW, hp, bhp, W, MW, and BTU/hr — engine specs, solar sizing, and HVAC math in one place. Size solar arrays and compare engine outputs correctly — free, local, no signup.
254 usable (256 minus network and broadcast). A /24 fits one office floor; /23 doubles it to 510 for growth.
First address identifies the subnet, last is broadcast — neither assigns to hosts. The tool marks both so DHCP scopes start correctly.
/24 is 255.255.255.0, /16 is 255.255.0.0 — each bit adds doubling. Enter either form; both display.
No — math runs locally in your browser. Nothing leaves your device.
Subnet Visualizer
See any CIDR as binary maps — IP, mask, and network bits plus a 32-block network/host bar. Single-network rendering only, no sub-subnetting — local rendering, free, no signup.
CIDR Calculator
Convert CIDR prefixes to masks, ranges, and host counts — /8 through /32 decoded. Answer 'how many IPs in a /22' instantly — local math, free, no signup.