IP subnet calculator
IPv4 + CIDR → network, broadcast, mask, usable range. Copy or share.
About / 關於

IP subnet calculator — Calculate IPv4 subnet details from IP + CIDR: network, broadcast, mask, wildcard, total/usable addresses, and usable range. Copy or share a link. Browser-only MVP.

Example: Use this tool to sanity-check numbers quickly, then share the link if you need to discuss with others.

FAQ: (1) Does it upload my data? No—runs in your browser. (2) Can I share results? Yes—use the share link feature. (3) Is it authoritative? Treat it as a convenience, not professional advice.

IP 子網計算器 — 輸入 IPv4 + CIDR，計算子網資訊：網路位址、廣播位址、子網遮罩、萬用遮罩、總/可用位址數與可用範圍。可複製或分享連結。純前端 MVP。

範例：用這個工具快速試算與對照結果，需要討論時再把連結分享給對方。

FAQ： (1) 會上傳資料嗎？不會，計算在瀏覽器內完成。 (2) 能分享結果嗎？可以，用分享連結。 (3) 準確嗎？請把它當作便利工具，不是專業建議。