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IPv4 Traffic Rule Checker

Evaluate an IPv4 packet against a simplified ordered rule list and identify the first matching rule. Work locally without uploading network information.

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

Evaluate packet

Local processing · no input storage

Network tools
Enter the value to evaluate.
Enter the value to evaluate.
Select the format or assumption to use.
Ignored for ICMP.
Five columns: permit/deny, ip/tcp/udp/icmp, source CIDR/any, destination CIDR/any, destination ports/any. Ports may be comma-separated or ranges. No header row.

First matching rule wins; no match means implicit deny. This is not vendor configuration parsing and does not simulate NAT, state, source ports, or ICMP types.

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 evaluate packet.
1. Add your data

Enter your network data or load the worked example.

2. Choose the result

Evaluate packet and review the result and assumptions.

3. Save it locally

Copy the result or download it for your engineering workflow.

About this tool

Use IPv4 Traffic Rule Checker without an upload

Evaluate an IPv4 packet against a simplified ordered rule list and identify the first matching rule. 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