About Network Prefix-List Generator
Turns a mixed list of IPv4 and IPv6 CIDR blocks into deterministic, normalized output for common network platforms. It detects malformed, duplicate, and overlapping entries; can summarize the exact address union; and generates plain text, Cisco IOS, Junos, AWS planning CSV, or an Azure IP Group ARM resource fragment without contacting any platform.
- Accepts up to 2,000 input lines and uses arbitrary-precision integer math for both address families.
- Aggregation preserves the exact address union but replaces per-entry descriptions.
- Cisco IOS and Junos output separates IPv4 and IPv6 list names.
- AWS CSV is a planning interchange, not a claimed console import format, because each AWS managed prefix list has one address family.
Frequently Asked Questions
- Will aggregation authorize additional addresses?
- No. The summarizer converts the merged address ranges back to the smallest exact set of CIDR blocks. It does not round outward.
- Can this deploy the generated list?
- No. The tool never authenticates to or calls a router or cloud API. Review syntax, resource limits, names, and change controls in the target environment.
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