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cidr-set-difference-examples

id string	family string	before_cidrs list	after_cidrs list	normalized_before_cidrs list	normalized_after_cidrs list	removed_cidrs list	added_cidrs list	before_count int64	after_count int64	removed_count int64	added_count int64	smallest_removed string	smallest_added string	interpretation string	limitation string	synthetic bool	address_source string
same-count-membership-shift-ipv4	ipv4	[ "198.51.100.0/25", "203.0.113.0/26" ]	[ "198.51.100.64/26", "203.0.113.0/25" ]	[ "198.51.100.0/25", "203.0.113.0/26" ]	[ "198.51.100.64/26", "203.0.113.0/25" ]	[ "198.51.100.0/26" ]	[ "203.0.113.64/26" ]	192	192	64	64	198.51.100.0	203.0.113.64	Equal totals can hide changed membership.	Mathematical address-set comparison only; not reachability, routing, firewall behavior, security policy, configuration validity, or change approval.	true	IANA documentation prefixes
same-count-membership-shift-ipv6	ipv6	[ "2001:db8:1::/125" ]	[ "2001:db8:1::/126", "2001:db8:2::/126" ]	[ "2001:db8:1::/125" ]	[ "2001:db8:1::/126", "2001:db8:2::/126" ]	[ "2001:db8:1::4/126" ]	[ "2001:db8:2::/126" ]	8	8	4	4	2001:db8:1::4	2001:db8:2::	Equal totals can hide changed membership.	Mathematical address-set comparison only; not reachability, routing, firewall behavior, security policy, configuration validity, or change approval.	true	IANA documentation prefixes
partial-overlap-shift-ipv4	ipv4	[ "192.0.2.0/25" ]	[ "192.0.2.64/26", "192.0.2.128/26" ]	[ "192.0.2.0/25" ]	[ "192.0.2.64/26", "192.0.2.128/26" ]	[ "192.0.2.0/26" ]	[ "192.0.2.128/26" ]	128	128	64	64	192.0.2.0	192.0.2.128	Overlapping before/after coverage still has exact removed and added fringes.	Mathematical address-set comparison only; not reachability, routing, firewall behavior, security policy, configuration validity, or change approval.	true	IANA documentation prefixes
normalized-no-change-ipv6	ipv6	[ "2001:db8:3::1/126", "2001:db8:3::4/126" ]	[ "2001:db8:3::/125" ]	[ "2001:db8:3::/125" ]	[ "2001:db8:3::/125" ]	[]	[]	8	8	0	0	null	null	Host-bit normalization and aggregation can yield no set change.	Mathematical address-set comparison only; not reachability, routing, firewall behavior, security policy, configuration validity, or change approval.	true	IANA documentation prefixes

CIDR Set-Difference Reference Examples

Four small, synthetic JSON Lines examples for checking IPv4 and IPv6 CIDR-list normalization and mathematical set differences.

Each row contains:

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.

Intended use

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.

Limits

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.

Data and rights

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.

Optional implementation reference

Yumi Network Set Evidence 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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