Free
Free
fwknop is open source software distributed from cipherdyne.org and GitHub without a SaaS subscription.
- Access
- fwknop is open source software distributed from cipherdyne.org and GitHub without a SaaS subscription.
fwknop
● Identity checkedCode · Vendor site 2026-10-04
It integrates with iptables, firewalld, PF, and ipfw to hide daemons such as SSH until authorized clients knock.
- Category
- Code
- Free access
- fwknop is open source software distributed from cipherdyne.org and GitHub without a SaaS subscription.
- API access
- Not confirmed
Is fwknop right for you?
A good fit for
Security engineers hardening remote access who want SPA instead of always-open port knocking schemes.
Before you choose
You operate fwknop on your own servers; the site documents the daemon rather than hosted monthly plans.
Single Packet Authorization daemon
fwknop couples libpcap packet sniffing with firewall controls so protected services stay invisible until clients pass cryptographic SPA challenges.
What it can do
Features & capabilities
Unknown is different from unavailable. Each fact carries its own evidence.
| Capability | Value | Evidence | Checked |
|---|---|---|---|
| Authorization model | Site explains SPA uses a single encrypted packet to grant access through default-drop firewall policies. | Facts sourced | 2026-10-04 |
| Firewall support | Documentation lists support for iptables, firewalld on Linux, ipfw on FreeBSD/macOS, and PF on OpenBSD. | Facts sourced | 2026-10-04 |
| Latest release | Download section references fwknop release 2.6.11 on the project page. | Facts sourced | 2026-10-04 |
Understand the total cost
fwknop pricing & plans
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Frequently asked questions
What is fwknop used for?
It integrates with iptables, firewalld, PF, and ipfw to hide daemons such as SSH until authorized clients knock.
Does fwknop have a free plan?
fwknop is open source software distributed from cipherdyne.org and GitHub without a SaaS subscription.. This record lists ongoing free access; check the plan limits before starting.
How much does fwknop cost?
No paid monthly price is listed; this record treats the product as free to start. See the plan cards for entitlements, billing commitments and seat minimums.
Can I use fwknop through an API?
Not confirmed. API access and subscription access may have different terms; consult the linked sources.
What should I check before choosing it?
You operate fwknop on your own servers; the site documents the daemon rather than hosted monthly plans.
Price history
No retained pricing changes yet. A current price alone does not establish a historical trend.
How this profile is supported
Identity and profile
Reviewed vendor source
Read original source ↗Facts apply to the named version and check date. Send a sourced correction if something changed.