<b>Checklist: Bot filtering — blacklist vs allowlist approach</b>

<b>Checklist: Bot filtering — blacklist vs allowlist approach</b>

Blacklist (block known-bad):
☐ Block datacenter ASNs, known crawler UAs, flagged IP ranges
☐ Lets everything else through — high fill, lower friction
☐ Always one step behind new bot patterns

Allowlist (only pass known-good):
☐ Permit only residential/carrier ASNs with real browser signals
☐ Tightest fraud control — bots can't pass what isn't allowed
☐ Risks blocking real users on unusual networks (VPNs, corporate)

Step — Choose by offer sensitivity.
☐ High-payout, fraud-strict advertiser → allowlist, eat the false negatives
☐ Volume CPI/CPA, tolerant advertiser → blacklist, keep fill high
Step — Log every block with reason so you can measure false-positive cost.

Tradeoff: blacklists maximize traffic but leak fraud; allowlists stop fraud but reject legit edge users.

Review blocked-traffic samples weekly to tune the line.

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