All free flowsMerge IPv4 Ranges into CIDRs
Convert each listed IPv4 interval,then combine overlaps and adjacent coverage into one exact CIDR list with every original source report.
Processing stays in your browser; code and assets download as needed. Original and checkpoint downloads retain source content, including omitted values. Reset and Exit stop this session’s owned work; they do not establish secure erasure or anonymity.
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About this flow
Convert each listed IPv4 interval,then combine overlaps and adjacent coverage into one exact CIDR list with every original source report.
Limitations
- Choose one UTF-8 CSV or TSV up to 64 KiB with exact first and last headers:1–20 data rows,2–10 columns. Each row is an inclusive IPv4 interval;endpoint cells allow up to64characters. Original tools trim endpoint whitespace and reject leading-zero octets,reversed ranges and IPv6. Overlapping,duplicate and adjacent ranges become one exact CIDR union without adding addresses. Counts include both interval endpoints. Download the final CIDR text with all original per-row reports,the complete union report,ordered CIDR input and unchanged source. Extra source cells remain private and unredacted,including formula-looking text;review before sharing. The list does not establish usable hosts,ownership,routing or firewall configuration. No spreadsheet cell-type or import-validity certificate.
- At most62CIDRblocks per originalIPv4interval;20rows yield at most1240sourceCIDRlines,within original2000line/100000character/400000byte aggregator limits. Original4MiBcompleteJSON and owned30secondworker/90secondconnection budgets retained.
