How many accounts can one proxy run?
For account work, the safe rule is one account per IP. Read-only browsing can share a line, but logged-in accounts on one address look connected. A dedicated modem gives each account its own exit.
The short answer: for any account you log into and use, treat one proxy as one account. If two logins share an IP, the platform can connect them, and one account's trouble becomes both accounts' trouble.
That rule has exceptions. Browsing without logging in, reading public pages, or checking a page from one region can share a line safely. The line is drawn at authentication: the moment a site can tie a session to a person, the IP becomes an identity.
Why one account per IP is the default
Platforms treat an IP as a signal, not proof. One address that logs into five accounts is not banned on sight. It is flagged, watched, and added to a cluster. When one account in the cluster breaks a rule, enforcement travels to the rest.
That is why the question is not how many accounts fit on a proxy. It is whether the platform ever links them. If it does, the number stops mattering.
When accounts can share a line
Two cases are usually safe. First, accounts that never log in from the proxy at the same time, on sites that only rate-limit by IP. Second, low-value or read-only sessions where no account is created or authenticated.
Both are fragile. A site can start scoring the IP tomorrow, and the sharing you relied on becomes a link.
What actually links accounts
Four things connect accounts: the network, the device fingerprint, shared session data like cookies, and behaviour such as identical timing. The IP is only one of them. A perfect proxy with the same browser fingerprint is still linked.
So a proxy solves the network layer, and an anti-detect browser or separate profiles solve the device and session layers. You need both for accounts that must stay apart. Pairing a proxy with an anti-detect browser covers the second half.
How many accounts per modem
On a dedicated line the unit is the modem, not the account. One customer gets one modem with one mobile IP. If you need three accounts that must not be linked, you want three lines, each with its own IP, not one line carrying three identities.
On this service a plan is one modem per customer, with extra lines available through support. See dedicated mobile proxy plans.
How to decide, in order
Work top to bottom. The first two lines decide how many lines you need; the rest is hygiene.
- List the accounts and mark which ones log in.
- If two logged-in accounts belong to different owners, give each its own IP.
- If they share an owner and a risk tolerance, you can group them and accept the link.
- Add browser isolation before you add more accounts to one IP.
- Test the line before a real account touches it, as in test a proxy before you rely on it.
The rule to remember
One logged-in account per IP. That is the number that keeps you out of trouble. If a line is shared and you did not ask for it, that is a different problem, covered in how to tell if a mobile proxy is shared.
Can I use one proxy for several accounts?
For read-only browsing, yes. For accounts you log into, one account per IP is the safe rule, because a shared address lets the platform link the accounts.
Does the proxy type change the answer?
It changes detection, not the rule. A dedicated mobile line is trusted more than a datacenter IP, but an address that logs into many accounts can still be clustered.
Do I also need separate browsers?
Yes. The IP is one signal. Shared cookies and a shared fingerprint still link accounts, so pair network isolation with profile isolation.
How many modems do I need for three accounts?
If the accounts must stay separate, use three lines, one IP each. If they can share an owner, one line with isolated browser profiles can work.