IP Blocking
Blocking all traffic to specific IP addresses regardless of protocol.
Definition
IP blocking prevents any network traffic from reaching specific IP addresses. This is a blunt instrument that affects all services hosted on the blocked IP, including unrelated websites sharing the same infrastructure.
IP blocking causes significant collateral damage when applied to cloud providers or CDNs where thousands of sites share IP addresses. It's most commonly used against VPN endpoints, Tor nodes, and dedicated infrastructure.
How We Detect This
We test TCP connectivity to IP addresses and compare results across vantage points. Complete connection failures or timeouts to IPs that are reachable from control locations indicate IP-level blocking. We distinguish this from server issues by testing multiple ports and protocols.
Examples
- •All connections to Telegram IP ranges fail
- •VPN server IPs unreachable from specific country
- •CDN IP blocked, affecting thousands of sites