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Route Longest Prefix Match

Find the longest matching IPv4 routes and show equally specific next-hop candidates. Work locally without uploading network information.

Runs entirely on your deviceNo uploads, accounts, cookies, or personal tracking.

Find matching routes

Local processing · no input storage

Network tools
Enter the value to evaluate.
One CIDR, next-hop IPv4 (or on-link), and optional interface per line. No header row.

Compares prefix length, not administrative distance or metrics. Equal longest prefixes are all shown without choosing a single next hop.

Text lists: up to 500 non-empty lines and 256 KiB per field. Tabular results: up to 5,000 rows.

Enter your data, then select find matching routes.
1. Add your data

Enter your network data or load the worked example.

2. Choose the result

Find matching routes and review the result and assumptions.

3. Save it locally

Copy the result or download it for your engineering workflow.

About this tool

Use Route Longest Prefix Match without an upload

Find the longest matching IPv4 routes and show equally specific next-hop candidates. Work locally without uploading network information.

The operation runs in the current browser tab. Tool input is not included in aggregate analytics, and the standalone download makes no analytics requests.

Network toolsDeveloper tools