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register_ip_block always blocked the exact signup IP as a /32 (or /128 for v6), which is close to pointless for the datacenter/VPN/proxy space these flags fire on: a repeat bad actor from the same provider almost never reuses the exact same address, but very often reuses a different one in the same block. classify_signup_ip now returns a fourth value, block_cidr — ipapi.is's asn.route CIDR when it's a valid network that actually contains the signup IP (already being tracked in ipapi_range_cache purely for lookup caching), falling back to the address's own /32 or /128 when no usable route exists. register_ip_block blocks that instead of always deriving a /32 itself. Added range_cache_tests() covering the cache/fallback logic directly (pure sqlite + ipaddress, no network), and updated the existing ip_scrutiny_tests()/combined_signal_tests() mocks for the new 4-tuple classify_signup_ip return and register_ip_block arity.