Volume costs money. A platform advertising unlimited free traffic is either reselling capacity it does not own, or it will disappear before your next test. Neither survives a real abuse complaint. IP booter shows what that business model looks like from the inside, including who ends up holding the record.
What the tier includes
The Basic plan at $0 a month, or trial credit from live support, with no card at either step. One concurrent test, short windows, and the full method list: 30+ Layer4 methods including SYN, UDP, ACK and connection churn. VIP stays off, so dedicated servers and 50-60 Gbit/s belong to paid plans. The report format does not change.
Four methods, four units
UDP measures raw packet rate, SYN half-open handshakes, ACK state-table pressure and churn socket open-close speed. One method per test, because two methods average two units and no threshold survives that. On a free window the point is to read one unit cleanly, not to cover the catalogue.
What a short run measures
Packet rate at the level you chose, connection behaviour and whether errors are transport or application. Not the saturation point: a knee needs a ramp and a ramp needs minutes. Treat the free run as a smoke test for both the platform and your endpoint, and the stresser panel is where a longer window is booked.
Why the limits exist
One target, one method, short window, no priority queue. Generators cost money every second, and a free tier that ignores that is funded by traffic aimed at addresses nobody confirmed. The IP stresser free account states the same limits from the address side, and neither tier lifts the ownership rule.
Reading the report
Delivery ratio first, because a short window does not warm pools. Then p95 at the rate you asked for: flat and clean means the endpoint held, climbing early means it deserves a longer window. Export the metrics and keep the target, method and window, so the next run compares against something rather than against memory.
After the run
Keep the report, then decide between a longer window and a different layer. Most teams overbuy on rate when the real gap was an application bottleneck, which a free L7 stresser run would have shown for nothing. If the numbers were not useful, you spent no money learning that a provider cannot measure.
The ownership check
Only systems you own or have written permission to test. Confirmation happens when the target is added and again when the run starts, and a failed confirmation means no traffic and no credit spent. A free account that ignores it is closed without refund, which is the same rule DDoS stresser states for paid windows.