# apphelp tool profile
name: Subnet Calculator
tool: tool-subnetcalculator
domain: subnetcalculator.apphelp.net
canonical: https://subnetcalculator.apphelp.net/en
summary: IPv4/IPv6 subnet calculator: network, broadcast, host range, usable hosts, netmask, wildcard, binary view, and split by subnet count or hosts per subnet. Pure browser math with BigInt.
inputs: IP with /prefix, dotted netmask or wildcard mask (e.g. 192.168.1.10/24, 10.0.0.1 255.255.0.0, 2001:db8::/48); split count or hosts per subnet.
outputs: Network/broadcast/first/last host, usable and total counts, masks, reverse DNS name, binary, subnet list (first 256) with copy.
use-cases: plan VLANs and subnets; check ACL coverage; convert CIDR and dotted masks
keywords: subnet calculator, cidr calculator, netmask calculator, 子网掩码计算器
languages: en, zh-CN, zh-TW, ar, de, fr
seo: locale-routed, canonical, hreflang, sitemap, robots, JSON-LD
geo: llm.txt profile, concise task summary, input/output contract, use-case list, local-first privacy notes
privacy: browser-local processing, no upload by default
limits: Equal-size subnetting only (no VLSM planner); subnet list shows first 256 entries.
related: https://iprangecidr.apphelp.net/en ; https://dnslookup.apphelp.net/en ; https://portlookup.apphelp.net/en
analytics: Microsoft Clarity and Google Analytics (opt-in)
no-login: true