It's a common assumption that a "residential" IP is automatically a clean one. It isn't — residential is a statement about who owns the network infrastructure, entirely separate from whether the specific address has a clean recent history.
Why the assumption exists
Residential addresses are generally harder to acquire in bulk than datacenter ranges, so large-scale automated abuse is statistically less common from them — this is the real, legitimate basis for treating residential traffic somewhat more leniently by default. But "less common in aggregate" is not the same as "individually guaranteed clean."
How a residential address inherits history
Most home internet connections use dynamically assigned addresses (see Static IP vs Dynamic IP) — meaning the specific address your household has today may have belonged to a completely different household weeks or months ago. If that previous occupant's device was compromised by malware, or their connection was used for abuse, some of that history can remain attached to the address in reputation databases until it ages out.
What this means practically
Don't assume a "clean" verdict just because a network type shows residential, and don't be alarmed by a flagged residential address without checking whether the flag is recent and specific to genuinely current behavior versus inherited history. The network-type classification and the behavioral reputation are two separate pieces of information — read both.
FAQ
Can I check whether my home IP has inherited a bad reputation?
Yes — running your own address through a reputation check like NetRiskScan's IP Risk Check shows current signals; if something looks wrong and doesn't match your own usage, it may reflect address reassignment history.