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서브넷 계산기

IP 서브넷 계산

브라우저에서 실행 · 업로드 없음

이 도구와 페이지의 안내는 현재 영어로만 제공됩니다. 동작은 똑같으며, 모든 처리는 브라우저에서 이루어집니다.

Network

  • 아무것도 기기 밖으로 나가지 않음
  • 서버의 파일 크기 제한 없음
  • 가입 불필요, 워터마크 없음
  • 무료

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.

자주 묻는 질문

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.