Why Anthropic blocks accounts
Anthropic is tightening control over access to Claude. Waves of bans hit both ordinary users and professionals working with the API. The reasons vary: suspicious activity, VPN use, shared IP addresses, or devices with a history of violations.
If you work with Claude in traffic arbitrage, landing page testing, or campaign scaling, the risk of a block is real.
How the protection system sees you
Anthropic uses multi-layered checks. The service analyzes:
- Connection country — if it doesn't match the account's history, the system may suspect phishing
- IP address and provider — data centers and hosting providers often end up on blacklists
- IP type — a dedicated address looks more reliable than a shared or dynamic one
- DNS and WebRTC leaks — leaks expose your real IP even when you use a VPN
- Browser fingerprints — unique combinations of extensions, fonts, and plugins get flagged by the system
If the parameters don't match previous sessions, Anthropic may request verification or close access altogether.
Net.Coffee Claude: what the tool checks
Net.Coffee Claude is a diagnostic service that shows how Anthropic sees your connection. The tool is free and runs right in the browser.
After the analysis runs, you get:
- Current country and provider
- IP characteristics (dedicated, hosting, residential)
- Data on possible leaks (if the VPN is leaking)
- Browser fingerprint and its uniqueness
- An overall block-risk score
This helps you understand why an account may be blocked and find a way to fix it.
Practical protection steps
Check yourself first
Go to Net.Coffee Claude and run the diagnostic. Watch for red flags — IP leaks, risky countries, atypical browser fingerprints.
If the IP shows as hosting
If you use a VPS or data center, Anthropic can see it. The fix: switch to a home connection or use a residential VPN (not a free one). Make sure the VPN doesn't leak through WebRTC.
If leaks are detected
DNS and WebRTC leaks expose your real address even with the VPN on. Disable WebRTC in the browser via an extension or flags, and configure DNS at the system level.
Standardize your browser
Remove unnecessary extensions, use standard fonts, avoid installing rare plugins. The closer your fingerprint is to an "ordinary user," the lower the risk.
When it's better to create a new account
If the account is already blocked, an IP check won't help — you need a new account. But before creating one, make sure your IP and browser are "clean." Use an antidetect browser if you work with multiple accounts.
Bottom line
A trust check via Net.Coffee Claude gives clarity: if the IP is risky or the browser looks suspicious, it's better to fix it in advance than to recover an account later. For professionals scaling campaigns through Claude, diagnostics are basic account hygiene.
