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IP Network Membership Checker

Check which IPv4 addresses belong to supplied networks, with every matching range shown. Work locally without uploading network information.

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

Check membership

Local processing · no input storage

Network tools
One plain IPv4 address per line, without names or prefixes.
One CIDR, address, or start-end range per line.

Checks inclusive address membership only. A match is not a firewall permission decision.

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 check membership.
1. Add your data

Enter your network data or load the worked example.

2. Choose the result

Check membership and review the result and assumptions.

3. Save it locally

Copy the result or download it for your engineering workflow.

About this tool

Use IP Network Membership Checker without an upload

Check which IPv4 addresses belong to supplied networks, with every matching range shown. 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