Most people shopping for proxies compare price per GB, and maybe speed. Fair enough. But the thing that decides whether a request actually goes through is usually where the IP address comes from, and that part gets skipped a lot.

A website doesn't need cookies or browser fingerprints to start judging a visitor. The IP alone tells it who owns the address and roughly where it sits, and that lookup is done before the page even starts loading.

So if requests keep hitting CAPTCHAs or pulling the wrong prices, the IP's origin is usually the first thing worth checking.

What a Website Knows From the IP Alone

Quite a lot, actually. Public registries list which organization controls each block of addresses, and services like MaxMind and IP2Location go a step further by tagging those blocks as hosting, residential or cellular.

Plenty of anti-fraud tools check those tags on every page load, not just at login. And once a range gets labeled as hosting, it tends to stay that way for months.

It's a bit like caller ID. Nobody has said a word yet, but a call from an "unknown business line" gets picked up differently than one from a neighbor's number.

That split between hosting and home connections is basically the whole difference between residential and datacenter proxies, and honestly it matters more than whatever speed numbers a provider puts on its pricing page.

Under all of this, each block of addresses is announced by an autonomous system, and there are about 120,000 of them allocated worldwide. Amazon Web Services is AS16509, Comcast is AS7922. A server can tell those two apart instantly; there's no header to tweak that hides it.

Datacenter IPs Are Fast, but Sites Trust Them Less

Datacenter proxies run on servers with 1 Gbps or 10 Gbps uplinks, usually a few hops from a big internet exchange. Response times around 20 to 50 ms are pretty normal, while a residential exit going through someone's home Wi-Fi can add 200 ms or more on a bad day.

Trust is a different story, though. Bot protection scores traffic partly on IP reputation (Cloudflare's bot management overview says so directly), and a request from a known hosting range starts off with a worse score before it's done anything.

Mobile IPs are a weird exception. Carriers put hundreds of subscribers behind one address with carrier-grade NAT, so blocking a single mobile IP could lock out real customers. Most sites just won't do it, which is why mobile pools get through checks that stop nearly everything else.

Location Data Is Less Exact Than People Assume

A surprising amount of IP geolocation isn't measured at all. Network operators can simply publish where their addresses are, using the geofeed format laid out in RFC 8805 back in August 2020. When it came out, its authors said Google was already processing around 400 of these feeds covering over 750,000 address ranges.

Consumer ISPs usually keep their feeds accurate down to the city, mostly because wrong locations mean angry support tickets. Datacenter ranges tend to point at the facility itself. Ashburn, Virginia shows up constantly, even for IPs sold as "Texas" or "California."

Does that matter? Depends on the job. A Frankfurt datacenter IP will usually get German prices on Amazon.de, but it won't pass as a shopper in a small Bavarian town, and some retailers do change offers at that level.

Picking the Right Origin for the Task

For scraping public data that isn't heavily protected (product catalogs, public filings, docs pages), datacenter IPs are the obvious pick. They're usually sold per IP with unmetered bandwidth, while residential traffic is billed per GB, so per request the cost gap can hit 10x or more.

Logins are a different situation. Account management and social media work need ISP-assigned addresses that stay put for days, and static ISP proxies (hosted in data centers but announced under a consumer ISP's network) handle that well. They're probably the most underrated option out there right now.

Ad verification and local search checks need accurate location, so residential pools with city targeting make more sense. Mobile IPs are worth paying for in app testing. For most other tasks they're overkill.

Where Things Are Going

IPv6 is going to shake some of this up. Reputation systems are already starting to score whole /64 or /48 blocks instead of single addresses, so hiding where traffic comes from will only get harder.

Geofeeds will keep spreading too, which means location data should keep getting sharper. Teams that look at the ASN and connection type before they look at price are going to spend a lot less time fighting blocks than the ones just buying the cheapest gigabyte they can find.