Why IP bans fail against modern bot farms (and what replaces them)
Short answer: IP bans assume each attacker has a stable, identifiable address. Modern bot farms do not. They rotate through residential proxies and mobile IPs by the thousands, so an IP block list keeps banning yesterday's addresses while today's bots walk in clean. Studios that want durable enforcement have moved to behavioral identity: scoring the client, not the connection.
What IP bans were built for
A decade ago, a botting operation meant a rack of machines with a handful of static IPs. Ban those addresses and the farm went dark. The defense worked because the attacker's infrastructure was the bottleneck.
How modern bot farms dodge IP blocks
- Residential proxy networks. Operators rent access to millions of real residential IPs. Each bot session comes from a different home connection, often in the same city as your real players.
- Mobile IP rotation. Thousands of legitimate mobile players share single IPs through carrier-grade NAT, while bot clients hop between fresh mobile addresses constantly.
- Low-and-slow distribution. Farms run one bot per IP across a thousand addresses, so no single address looks abusive enough to trip a rate limit.
The collateral damage problem
Aggressive IP banning does not just miss bots; it hits players. University dorms, shared housing, internet cafes, and entire mobile carriers sit behind a small pool of addresses. Ban the address and you ban every legitimate player behind it, while the bots rotated an hour ago and never noticed.
What replaces the IP ban
- Behavioral identity. Score the client by how it behaves: input cadence, session patterns, and navigation paths. A bot on a fresh residential IP still moves like a bot.
- Account-level enforcement. Tie consequences to the account and its history, not the connection, so a flagged account stays flagged on any IP.
- Graduated friction. Route suspicious sessions into extra verification or throttled matchmaking instead of binary ban-or-allow. Bots see their economics collapse; false positives just see a CAPTCHA.
Where IP data still helps
IP reputation is not useless, but it is not an enforcement layer anymore. An IP from a known datacenter range raises suspicion, but no single IP should be the reason an account gets banned. The decision needs corroboration from behavior.
The migration path for live games
- Keep existing IP blocks in monitor mode to measure how many would have been false positives.
- Score sessions on behavioral signals alongside IP, and compare which catches the bots your team already knows about.
- Move enforcement to account-level actions with graduated friction first, hard bans only for corroborated cases.
- Review the IP list monthly. Anything older than a few weeks is probably banning someone else's customers.