IP Aggregation Calculator — Supernet & Route Summary from CIDR

Aggregation replaces multiple specific prefixes with one shorter mask announcement when address blocks are contiguous and align on binary boundaries. Announcing 10.0.0.0/22 instead of four /24s reduces global BGP table churn and simplifies firewall rule sets.

Misaligned aggregation leaks unintended address space or blackholes traffic. Verifying the supernet's network and broadcast with a calculator catches off-by-one boundary errors before they reach production routers.

MissingClientWidgets renders NetworkCalculatorWidget with kind network-calculator. Enter your proposed summary CIDR. The CIDR row echoes canonical notation for IRR route objects and cloud aggregate entries.

Host Range shows the full span — confirm every child subnet's hosts fall inside before deaggregating old announcements.

Only contiguous power-of-two-aligned blocks aggregate cleanly into one shorter prefix. If 10.0.0.0/24 and 10.0.2.0/24 are not adjacent, no single supernet covers both without including holes.

Run separate calculations for each candidate supernet during redesign. ip-range-to-cidr-converter complements this page when deriving child blocks.

A /22 provides 1024 address slots — Usable Hosts reports assignable count under classic LAN rules. Capacity planners use this when deciding whether aggregation leaves enough room for future growth inside the summary.

When aggregation shrinks prefix length, ACL wildcard lines change. Copy Wildcard row into router templates after verifying supernet math here.

Pre-merger route plans and confidential address allocations stay local. No telemetry uploads your CIDR strings to VSPIC servers.

autonomous-system-information-lookup shows which prefixes an AS announces publicly. Use aggregation calculator for private planning, then BGP lookup to compare live advertisements after deployment.

Pair with ip-network-calculator when teaching how /23 and /22 boundaries differ.

Hyperscale clouds accept CIDR in security rules. After aggregating subnets, paste verified CIDR from results into Terraform aws_security_group_rule resources — one rule instead of dozens reduces drift.

CCNA and CCNP labs ask learners to pick valid supernets covering given subnets. Instant calculator verification accelerates study without waiting for instructor office hours.