Proxies are sorted along two independent lines: where the IP address comes from, and how long you keep it. Understanding both is what makes the choice straightforward, because almost every wrong purchase comes from matching one correctly and ignoring the other.
The Two Ways Proxies Are Classified
By IP source there are four types: residential, ISP, datacenter and mobile. This determines how a website perceives you, and therefore how likely you are to be blocked.
By session behaviour there are two: rotating and static. This determines whether your IP changes as you work, and therefore whether anything that depends on a session survives.
These are separate axes, and they combine freely. Rotating residential, static residential, rotating datacenter and static datacenter are all real products. A common mistake, repeated in a great deal of published material, is to treat “rotating” as a synonym for “residential”. It is not. One describes how the session behaves, the other describes where the address originates.
| Type | IP source | Speed | Detection risk | Typical cost | Best use case |
|---|---|---|---|---|---|
| Residential | Consumer ISPs, real households | Moderate | Low | Per GB, mid range | Scraping protected sites, geo-targeted checks |
| ISP | Consumer ISPs, datacenter-hosted | High | Low to moderate | Per IP per month | Long-lived sessions and accounts |
| Datacenter | Hosting providers | Highest | High | Per GB or per IP, cheapest | High-volume work on unprotected targets |
| Mobile | Mobile carriers, via carrier-grade NAT | Moderate to low | Lowest | Per GB, most expensive | Account creation, the hardest targets |
Residential Proxies
A residential proxy routes your request through an IP address that a consumer internet provider assigned to a real household. To the website you are visiting, the traffic is indistinguishable from an ordinary visitor in that location, because in terms of address ownership it is exactly that.
This is what makes residential the default for anything that gets defended: retail sites, travel, social platforms, search results. They are slower than datacenter proxies because the traffic crosses real consumer connections, and they are usually billed per gigabyte.
Shifter’s residential proxies cover 195+ countries with city and ASN-level targeting.
ISP Proxies
ISP proxies, sometimes called static residential proxies, are the useful hybrid. The IP addresses are allocated by consumer internet providers, so websites classify them as residential, but they are hosted on datacenter infrastructure, so they are fast and always available. You hold the same address for as long as you keep the plan.
The industry-standard name is worth using because it describes the product accurately. An older habit is to file these under “static proxies” without ever saying what makes them different, which hides the important detail: the address ownership is residential, only the hosting is not.
They are usually sold per IP per month rather than per gigabyte, which suits work where one address does a lot of traffic. Shifter’s ISP proxies are priced this way.
Datacenter Proxies
A datacenter proxy uses an IP address registered to a hosting or cloud company. It has no relationship with any consumer internet provider, and it was never issued to a household.
This is the definition most often stated incorrectly. Datacenter IPs are not addresses “associated with an ISP but without the end user”, which describes ISP proxies instead. Datacenter IPs belong to hosting providers, and the ranges they occupy are published, which is precisely why they are easy to identify and block.
They are the fastest and cheapest option, and against a target with no bot defences they are the right economic choice. Against anything protected, they fail early.
Mobile Proxies
A mobile proxy routes through a mobile carrier network. Because carriers put many subscribers behind a single public address using carrier-grade NAT, one mobile IP may represent hundreds of genuine users. Blocking it means blocking real customers, so platforms are markedly more cautious.
That tolerance makes mobile the strongest option for account creation and for targets that defeat everything else. It is also the most expensive per gigabyte, and the shared nature means you cannot rely on holding one address.
Rotating and Static
Rotation is the second axis, and it is a separate decision from the four types above.
Rotating proxies hand you a different IP either on every request or on a timer. This spreads a workload across a large pool so no single address accumulates enough traffic to look unusual. It is the right default for scraping, price monitoring and any bulk collection where requests are independent.
Static proxies keep the same IP for as long as you hold it. Anything with a login, a shopping basket or a multi-step flow needs this, because a session that changes address mid-way looks like a hijacked account.
Most residential services support both through sticky sessions, where you hold an address for a set duration and then release it.
Which Type for Which Job
| Application | Recommended type | Why |
|---|---|---|
| Web scraping | Rotating residential, or datacenter on soft targets | Volume across many addresses, matched to how hard the target defends itself |
| Ad verification | Rotating residential | Ads must be checked as a genuine local visitor would see them |
| Price intelligence | Rotating residential | Retail sites price by geography and defend against bulk collection |
| Social media management | ISP or mobile | Accounts need a stable, trusted address, and creation needs maximum tolerance |
| SEO monitoring | Rotating residential | Search results vary by location and search engines rate-limit aggressively |
| AI and LLM data collection | Rotating residential at volume | Broad, continuous crawling of protected sources at scale |
AI training and grounding data is now one of the largest sources of proxy demand, and it behaves like scraping with the volume turned up: broad coverage, continuous collection, and targets that increasingly defend against exactly this.
Choosing
The decision comes down to three questions, in order:
- Does the target defend itself? If yes, residential or mobile. If no, datacenter and save the money.
- Does the work involve a session or a login? If yes, static or ISP. If no, rotating.
- What is the volume? Per-gigabyte pricing suits bursty or moderate use. Per-IP pricing suits a small number of addresses doing sustained work.
Most teams end up with more than one type. A price intelligence operation might run rotating residential for collection and a handful of ISP proxies for the dashboards it logs into.
If you are not sure where to start, compare the plans and begin on the smallest residential tier. It costs little to test a target and find out whether you need to move up.
Conclusion
There is no best proxy type, only a best fit for a specific job. The four IP sources trade cost against trust, and the two session behaviours trade scale against continuity. Pick one from each axis based on what your target does and whether your work has a session in it.
For a deeper look at the comparison that trips people up most often, see static vs rotating proxies, and for choosing a type for collection work specifically, web scraping proxies.