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hping3 vs Ostinato: catalog facts
hping3	Ostinato
Free Free and open source under the GPL.	Paid Sold under several license tiers compared on the official site, with a web demo available.
macOS, Linux, Command line	Windows, macOS, Linux
Crafts arbitrary packets, so firewall and filtering behaviour can be tested precisely Advanced traceroute and path MTU discovery modes	Generates and replays custom L2/L3 traffic Runs on standard hardware, including a laptop
Requires root and can disrupt networks if used carelessly Development stopped years ago	Commercial licensing rather than a free download Aimed at network engineers; assumes protocol knowledge
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.