This feature spoofs the network fingerprint of your proxy to match a chosen operating system. It is free and available to all clients.
Why it matters. Anti-fraud systems (p0f, Akamai, Cloudflare and others) detect a device operating system from TCP packet parameters — TTL, MSS, Window Size, TCP options order. If your antidetect browser claims Android while the network stack looks like Windows, this mismatch can raise a flag. The feature aligns the network level with what you declare in the browser.
Important: this is a separate masking layer. It does not replace an antidetect browser — it complements it, covering the network level that the browser fingerprint does not.
How to enable it
- Dashboard → «My proxies».
- Click the gear icon on the right side of the proxy row.
- Select «TCP Fingerprint».
- In the window that opens, pick an OS profile from the list.
- Click «Apply».
The setting is applied on the fly: there is no need to restart your software or change your connection credentials.
How to check the result. The same window includes a diagnostic — it sends a test request through your proxy and compares what an external service sees with the selected profile. Some parameters may differ from the reference values, and that is normal network behaviour: see the questions section below.
If the proxy stops responding after you select a profile
- Open the same window and select «— Native OS (reset profile) —». If the connection is restored, the profile is the cause.
- Try another profile from the list: different profiles interact differently with a particular carrier network.
- If no profile works, leave Native OS and send us the proxy PID and the profile name — we will look into your specific case.
Which proxies support the feature. A profile is assigned to specific equipment. If the gear menu of a proxy has no «TCP Fingerprint» item, the feature is not yet available for that equipment — try changing equipment within the same GEO. Availability depends on the equipment, not on the country you selected.
Does a profile affect speed? The spoofing itself works at the packet header level and adds no noticeable load. However, a profile also sets MSS and window size, and these parameters influence how the network transfers data. If speed drops on a particular proxy after you enable a profile, compare it with Native OS mode and pick another profile if needed.
Configuring via API. The profile can also be managed programmatically — the command and its parameters are described in the «API» section of your dashboard. The proxy identifier in the request is the same number (PID) shown in the first column of the «My proxies» table. An error such as proxy_or_proxy_id_required means the identifier was not sent, or was sent under a different parameter name: check the request example in the «API» section.
Common questions
Is this the same as the fingerprint in an antidetect browser?
No. The browser fingerprint works inside the browser (JavaScript, Canvas, User-Agent). Ours works at the network packet level, independent of the browser. For full masking they are used together.
Will the setting be lost if I change the GEO or operator?
No. The profile is automatically carried over to the new equipment — you lose nothing.
MSS shows 1400 instead of 1460 — is this a bug?
No. The mobile operator lowers the MSS in 4G networks (the PMTUd, Path MTU Discovery mechanism). This does not depend on our feature. The diagnostics account for this behaviour and still show «match».
TTL shows 47 but 64 was expected — does it not work?
No. TTL decreases at every router along the path (natural hop decrement). If there are 17 hops between you and the checking service, TTL will be 64−17=47. The diagnostics account for the number of hops and restore the original value.
Do Android 11 and Android 15 behave the same?
Yes. They have an identical network stack (TCP): OS versions differ in the interface, not in network parameters.
Can I revert to how it was?
Yes. Open the settings window → select «— Native OS (reset profile) —» → apply.
Is it paid?
No. The feature is free for all clients, with no extra charge.