IP Rotation

IP rotation is the practice of deliberately changing the source IP address your requests come from, so a large volume of traffic arrives spread across many addresses instead of concentrated on one. It is the technique; a rotating proxy is the product that implements it for you.

The distinction matters when deciding what to buy. You can rotate addresses yourself by holding a list and cycling through it in code. Most people do not, because maintaining that list — testing addresses, retiring burned ones, replacing them — is considerably more work than the rotation itself.

Four strategies, not one

• Per request — a new IP for every call. Maximum spread, no continuity. Correct for stateless crawling.
• Timed — a new IP every few minutes regardless of request count. Simple, and it keeps short workflows intact by accident rather than by design.
• Per session — one address held deliberately for a defined task, then discarded. This is a sticky session, and stateful work requires it.
• On failure — keep an address until it returns a 403, a 429, or a CAPTCHA, then rotate and retry. Efficient with expensive pools, but every rotation is triggered by a request you have already lost.

Mature scrapers combine them: sessions for anything stateful, per-request for bulk pages, and failure-triggered rotation underneath both as a safety net.

How fast should you rotate?

Faster is not better. Rotating on every request discards every warm TCP connection and TLS handshake, which is measurably slower, and it produces a pattern — one request per address, never returning — that resembles no human browsing session at all.

Work backwards from the target instead. If a site tolerates roughly 60 requests an hour from one address and you need 60,000 requests in that hour, you need about 1,000 addresses in play. Volume divided by the rate the target tolerates is the number that matters — not the pool size you were sold.

Diversity beats raw count

A pool of 10,000 addresses that all sit in the same /24 subnet behaves like a handful of addresses, because anti-bot systems block by range and by ASN rather than one IP at a time. When comparing providers, ask how many distinct subnets and ASNs a pool spans, not how many addresses it claims.

Geographic consistency matters just as much. Rotating one user's session across three continents in ten minutes is a stronger bot signal than never rotating at all. Pin rotation to a single country, or a single city, whenever the task implies a location.

When rotation is the wrong tool

Rotation solves rate limits. It does not solve identity. Anything that involves being logged in, holding a basket, completing a multi-step form, or maintaining an account over weeks needs a stable address — and for that an ISP proxy is usually the better purchase. Rotating mid-task does not make you anonymous; it makes you fail.

It is only one layer

Your user agent, headers, TLS fingerprint, cookies, and request timing all survive a rotation completely untouched. If those stay identical across a thousand addresses, you have not created a thousand visitors — you have created one very conspicuous visitor holding a thousand IPs. Pair rotation with throttling and per-session fingerprints, or it buys you far less than you paid for.