Reachability Check

Finds out which addresses open from this computer and this connection, and which ones do not. Copy the result and send it back.

Public IP
Checking…
Network / ASN
Checking…
Location
Checking…
Run at
—

Addresses

Idle
Two reference addresses are always checked alongside yours. They tell apart a dead connection from a single address being blocked.

Results

3 attempts per address
What this check can and cannot tell you

It can tell you

  • Whether this connection actually reaches the address, how many attempts out of three succeeded, and how long each took
  • Whether the reference addresses work while yours does not — which separates a network outage from a per-address block
  • Which of several addresses is reachable right now
  • The address's real IP, from public DNS. If nslookup on this machine returns something different, DNS is being tampered with

It cannot tell you — a browser has no access to raw sockets.

  • Why a request failed. A refused connection, a silent drop and a certificate error all surface as the same generic error
  • The result of an SNI comparison — connecting to the same IP under a different hostname, which is what proves a block
  • What DNS answer this machine actually received

For a definitive answer, run net-block-check.ps1 in Windows PowerShell. It covers all three.

Public IP and network lookup use an external service. This page stores nothing.