Route Summarization / CIDR Aggregation
Summarize up to 100 IPv4 CIDRs, calculate entry savings and exact address coverage, and warn about extra coverage and blackhole risk.
About this route summarization / cidr aggregation
Summarize up to 100 IPv4 CIDRs, calculate entry savings and exact address coverage, and warn about extra coverage and blackhole risk Performs protocol inspection, IP calculation, and network analysis client-side without sending probes or exposing network topology.
Protocol mechanics & network logic
The execution engine processes input tokens and applies transformations in the browser sandbox. Specifically, Enter 1–100 IPv4 CIDRs separated by spaces, newlines or commas in the coverage panel. Results update locally. The separate text calculator below retains its inputRoutes and summary JSON output and the same 100-route limit.
Worked network diagnostic scenario
Scenario: Summarize four adjacent IPv4 /24 routes.
Sample input:
Processing: Normalize the endpoints, find the common prefix of the lowest start and highest end. Four adjacent /24 routes from 192.168.0.0/24 through 192.168.3.0/24 → 192.168.0.0/22, 75% entry savings, 1024 covered and 0 extra addresses. Only 192.168.0.0/24 and 192.168.2.0/24 → the same /22, 50% savings, 512 covered and 512 extra addresses: blackhole risk.
Illustrative output:
Addressing limits & protocol boundaries
One spanning supernet, not a minimal exact CIDR set. Host bits are normalized; duplicate and overlapping addresses count once in coverage. Entry savings are (input entries − 1) / input entries × 100, including duplicate entries; they are hypothetical, not measured router memory. Address counts include network and broadcast addresses, not just usable hosts. IPv4 only; no IPv6, BGP/OSPF inspection, reachability test, configuration or downloaded file.
Addressing calculations and subnet models in Route Summarization / CIDR Aggregation follow IETF RFC definitions. Ensure subnet masks and CIDR prefixes match your network topology.
Offline network inspection boundary
Address parsing and CIDR calculations in Route Summarization / CIDR Aggregation run entirely client-side without probing external IP networks or transmitting routing data.
IETF RFC specifications & IANA registries
IETF Request for Comments (RFC) standards and IANA registry references:
- Implementation-specific browser utility or reference guide (no single governing external standard)
Route Summarization / CIDR Aggregation verification · Audit standards
How to use it
- Results update locally.
- Review parameter fields, units, or options configured for Route Summarization / CIDR Aggregation.
- Click the action button or observe immediate live calculations rendered by Route Summarization / CIDR Aggregation.
IP Address Route Summarization, Supernetting Mechanics, and CIDR Aggregation →
A comprehensive network engineering guide to IP route summarization, Classless Inter-Domain Routing (CIDR) supernetting, radix tree lookups, and routing table optimization.
Frequently asked questions
Route aggregation coverage?+
Enter 1–100 IPv4 CIDRs separated by spaces, newlines or commas in the coverage panel. Results update locally.
What input and result are available?+
Boundary constraints concerning "What input and result are available?" prevent invalid parameter state mutations client-side.
Which limits apply?+
Blackhole risk: this summary also covers the listed gaps, which were absent from the inputs. Advertising it can attract traffic for unrelated or unreachable networks. Keep appropriate more-specific routes and review routing policy; RFC 4632 §5.1 describes discard handling for unmatched aggregate traffic. No device was checked or changed.
What result does the worked example produce?+
Security isolation for "What result does the worked example produce?" ensures zero transmission beyond your local workstation.