# apphelp tool profile
name: IP Range ↔ CIDR
tool: tool-iprangecidr
domain: iprangecidr.apphelp.net
canonical: https://iprangecidr.apphelp.net/en
summary: Convert IP ranges to the minimal CIDR list, merge/de-duplicate CIDRs, output as CIDR, start-end or IP+netmask, and test whether an IP is covered. IPv4 and IPv6.
inputs: Lines or comma lists of ranges (a-b), CIDRs, ip/netmask, single IPs.
outputs: Copyable or downloadable .txt list; IPv4/IPv6 address totals; membership check.
use-cases: firewall allowlists; shrink blocklists; range to CIDR for WAF rules
keywords: ip range to cidr, cidr merge, cidr aggregator, IP 段转 CIDR
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: Up to about 100k output CIDRs per range.
related: https://subnetcalculator.apphelp.net/en ; https://dnslookup.apphelp.net/en ; https://portlookup.apphelp.net/en
analytics: Microsoft Clarity and Google Analytics (opt-in)
no-login: true