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サブネット計算

IP サブネットを計算

ブラウザで動作 · アップロード不要

このツールとページ内の説明は、現在は英語のみです。動作は同じで、すべてブラウザ内で実行されます。

Network

  • 何も端末から出ません
  • サーバーによるサイズ制限なし
  • 登録不要・透かしなし
  • 無料

How to calculate a subnet

  1. Enter an address and prefix, like 192.168.1.10/24, or an address and mask, like 10.0.0.1 255.255.0.0.
  2. Read the network, broadcast, host range and masks.
  3. To divide the network, choose the size of each smaller subnet.

Common IPv4 prefixes

PrefixSubnet maskUsable hosts
/8255.0.0.016,777,214
/16255.255.0.065,534
/24255.255.255.0254
/26255.255.255.19262
/28255.255.255.24014
/30255.255.255.2522
/31255.255.255.2542 (point-to-point links)
/32255.255.255.2551 (a single address)

Good to know

  • Two addresses of every IPv4 subnet are reserved: the network address and the broadcast address. /31 and /32 are the exceptions.
  • Private ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) are recognised, along with loopback, link-local and carrier-grade NAT.
  • IPv6 addresses are shown in their shortest standard form (RFC 5952) and in full.

よくある質問

What is a wildcard mask?

The opposite of the subnet mask (0.0.0.255 for /24). Cisco access lists and OSPF use it.

Is anything sent anywhere?

No. Everything happens in your browser, and the page is blocked from uploading anything.