/Firewall ACL Simulator

Inject a virtual packet against a top-down list of ACL rules to see exactly which rule allows or drops it. 100% offline.

Local processing

This tool processes your input in your browser.

Firewall Rules (Top-Down)

No rules defined. Import from Universal ACL Builder or add manually.

Simulated Packet

Protocol

Source IP

Src Port

Dest IP

Dst Port

Calculate network addresses, broadcast, ranges, and wildcard masks.

Variable Length Subnet Masking calculator to divide a network into subnets of different sizes.

Create firewall rules and compile to Cisco, MikroTik, or FortiGate

Build and execute IT operations and troubleshooting runbooks dynamically.