| --- |
| license: cc0-1.0 |
| pretty_name: CIDR Set-Difference Reference Examples |
| tags: |
| - networking |
| - cidr |
| - ipv4 |
| - ipv6 |
| - set-difference |
| --- |
| |
| # CIDR Set-Difference Reference Examples |
|
|
| Four small, synthetic JSON Lines examples for checking IPv4 and IPv6 CIDR-list normalization and mathematical set differences. |
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| Each row contains: |
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| - `before_cidrs` and `after_cidrs`: input lists; |
| - `normalized_before_cidrs` and `normalized_after_cidrs`: collapsed network coverage; |
| - exact minimal `removed_cidrs` and `added_cidrs`; |
| - before, after, removed and added address counts; |
| - the smallest removed and added address when nonempty; |
| - a short interpretation and limitation. |
|
|
| The examples cover equal totals with changed membership in both address families, a partial-overlap shift, and a normalization/aggregation no-change case. All addresses use IANA documentation prefixes. The expected values were calculated with Python's standard-library `ipaddress` module. |
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| ## Intended use |
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| Use these rows as readable fixtures for parsers, tutorials, comparison UIs, or independent implementations of CIDR-list set difference. They are synthetic reference examples, not an exhaustive conformance suite or certification. |
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| ## Limits |
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| These rows compare mathematical address sets only. They do not assess reachability, routing, firewall behavior, security policy, configuration validity, or whether a network change should be applied. |
|
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| ## Data and rights |
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| The dataset text and expected results are original synthetic material dedicated under CC0-1.0. The IP ranges are reserved documentation prefixes; no user, production, private, credential, telemetry, or customer data is included. |
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| ## Optional implementation reference |
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| [Yumi Network Set Evidence](https://noqt.no-qt.chatgpt.site/yumi/network-sets) is one public implementation of before/after CIDR-list comparison. The dataset is self-contained and does not require that implementation. |
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