IP Pool Behind a USA 5G Line: How Many Addresses?

A dedicated 5G line has one SIM and one device, so where do new addresses come from when you rotate, and how many are there? The answer is the carrier's regional gateway pool: a finite set of public IPv4 addresses that T-Mobile, Verizon or AT&T maps onto thousands of subscribers in a metro through carrier-grade NAT. A rotation reconnects the device's data session and the gateway hands it a new mapping from that set. This guide explains what the pool is, why its size is in the hundreds to low thousands per carrier per metro rather than millions, why the same address can come back, and how to measure the pool behind your own line with a short script.

Where a mobile address comes from

A phone or modem does not own a public address. It gets a private one inside the carrier's network, and the gateway for its region translates that to a public address shared with many other devices. Each carrier runs a modest number of gateways, each with a block of public addresses. Our Houston phones, for example, draw from the gateways that serve Texas; a line in New York draws from the gateways that serve the Northeast. The pool behind a line is therefore the pool behind its carrier and its metro, not something the line carries with it.

What a rotation does

Rotation drops the device's data session and brings it back. The gateway assigns a fresh public mapping, which is usually a different address from the one just released, drawn from whatever is free in the pool at that moment. On a 5G line the reconnection completes in seconds and the next request already runs at full speed. The carrier may also change the mapping on its own when it resets a session, which is why an address left alone can still change after many hours.

How big the pool is, honestly

Per carrier per metro, a line typically sees a few hundred to a few thousand distinct public addresses over a long period of rotations. Advertising copy elsewhere that speaks of millions of IPs describes residential pools spread across many homes, not one carrier line. For a dedicated line, the honest statement is that the pool is as deep as the carrier's regional gateway, that it is shared with the region's real phones, and that this sharing is exactly what gives the address its reputation.

T-Mobile's gateways tend to map more tightly to the metro and rotate through a visibly larger set of addresses; AT&T's regional hubs serve wider areas; Verizon's can place the address in another city of the same state. All three are large enough for proxy work that rotates between tasks rather than on every request.

Why repeats happen and why they do not matter

Because the pool is finite and the gateway hands out whatever is free, an address you held earlier can come back. On a quiet night in a small metro that can happen within a few dozen rotations; in Houston during the day it takes far longer. A repeat is not a fault. The address is still the carrier's, still cellular, still in the metro, and the website sees a phone that happens to have the same public address as a phone it saw before, which is normal on a carrier network.

If a specific job needs a guaranteed-new address each time, rotate, look the address up, and rotate again if it matches a recent one. A short script does this in a second.

Measuring the pool behind your line

You do not have to take our word for it. Rotate the line on a timer, look the address up after each rotation, and count the distinct results. An hour at one rotation per minute gives a first picture; a day gives a fair one. The rotation link and an IP lookup are all you need.

1. The rotation link is on the line's dashboard card. Copy it from there.
2. Write a loop that calls the link, waits twenty seconds for the new session, then requests an IP lookup through the line's SOCKS5 port.
3. Record the address, the carrier and the city for each pass.
4. Run it for an hour at one pass per minute, then count distinct addresses and note how many passes before the first repeat.
5. Repeat on another carrier or metro and compare; moves between metros are free.

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