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Byteful launches TCP/IP fingerprint emulation for datacenter and ISP proxies

Byteful has launched TCP/IP Fingerprint Emulation in beta: datacenter and ISP proxy customers can now make their connection appear to come from Windows, macOS, Linux, Android or iOS — per request or set once at export.

Byteful, the Manchester-based proxy provider, has launched a beta feature called TCP/IP Fingerprint Emulation for its datacenter and ISP (static residential) proxies, announced on 21 October 2026.

What it does

Anti-bot systems increasingly inspect the TCP/IP fingerprint of a connection — how it behaves at the transport layer before any HTTP is sent. Since proxy servers typically run Linux, a browser identifying as Windows while the connection behaves like Linux creates a mismatch that can get traffic flagged.

Byteful built a user-space TCP stack so customers can choose which operating system their connection appears to come from:

  • Five operating systems: Windows, macOS, Linux, Android and iOS.
  • Datacenter and ISP proxies: available on both static proxy types; rotating residential and mobile proxies are not part of this release.
  • Per-request control: the OS can be added as a parameter in the proxy username (e.g. USER_os_windows), so each request can carry a different fingerprint.
  • Set at export: a fingerprint can be chosen when exporting a proxy list from the dashboard.

The feature complements Byteful's existing OS Targeting, which selects proxies by the operating system they run on. The beta is live now for every datacenter and ISP customer.

Byteful offers datacenter, static residential (ISP), rotating residential and mobile proxies across 195+ countries with a residential pool of more than 35 million IPs.

Sources