RKN Block Checker

A small CLI that figures out whether the connection you're sitting on is in an RKN/TSPU-blocked zone — and, more usefully, what kind of block it is (DNS poisoning, TCP reset, TLS DPI on SNI, or an ISP stub page).

The point isn't "site X doesn't open." Browsers already tell you that. The point is to look at each layer of the stack independently and report where it broke. That tells you a lot more about your situation than a generic "this site can't be reached" page.

Example output

Same output as plain text

======================================================================
  RKN Block Checker
======================================================================
  IP:       95.165.xxx.xxx
  ISP:      AS12389 Rostelecom
  Location: Moscow, Moscow, RU
----------------------------------------------------------------------

Whitelist (should always work)
  name          verdict            TCP     TLS     PLT  status
  ------------------------------------------------------------
  gosuslugi     ✓ OK              18ms    42ms   380ms  200
  yandex        ✓ OK               8ms    25ms    95ms  200
  sberbank      ✓ OK              12ms    38ms   250ms  200
  vk            ✓ OK               9ms    28ms   180ms  200
  ...

Blacklist (RKN-restricted)
  name          verdict            TCP     TLS     PLT  status
  ------------------------------------------------------------
  instagram     ✗ TLS BLOCK       22ms       —       —  —
    └ TLS reset — DPI cutting on SNI (typical RKN/TSPU)
  twitter/x     ✗ TLS BLOCK       24ms       —       —  —
    └ TLS timeout — silent drop after ClientHello
  rutracker     ✗ HTTP STUB       18ms    45ms   120ms  200
    └ response body matches an ISP stub-page marker
  protonvpn     ✗ DNS BLOCK          —       —       —  —
    └ system DNS doesn't resolve, DoH does — DNS poisoning
  ...

======================================================================
  Summary
----------------------------------------------------------------------
  Whitelist: 21/21 working
  Blacklist: 3/15 open, 12/15 blocked

  → You ARE in an RKN-blocked zone.

  Block types in the blacklist:
    ✗ TLS BLOCK: 8
    ✗ DNS BLOCK: 2
    ✗ HTTP STUB: 2
======================================================================

Install

Python 3.10+.

pip install rkn-block-checker
rkn-check

Or from source:

git clone 
cd rkn-block-checker
pip install -e .
rkn-check

Usage

rkn-check [-h] [--json] [--white] [--black] [--timeout TIMEOUT]
          [--workers WORKERS] [-v]

| flag | what it does | |------|--------------| | --json | machine-readable JSON instead of the colored report | | --white | only the control (whitelist) targets | | --black | only the blacklist targets | | --timeout | per-probe timeout in seconds (default 5.0) | | --workers | thread pool size for parallel checks (default 10) | | -v / -vv | logging at INFO / DEBUG |

JSON output