# Multiple accounts on the same IP address > Multiple accounts on the same IP address are normal: homes, offices and mobile carriers share one. It matters when the accounts share more than the IP. Source: https://mosaicbrowser.com/guides/multiple-accounts-on-the-same-ip-address ## Multiple accounts on the same IP address: is it a problem? Having multiple accounts on the same IP address is normal and usually fine, because households, offices and mobile carriers put many people behind one address. It becomes a problem when the platform limits accounts and the accounts also share cookies, a fingerprint or payment details. ![One address, many accounts, beside a screenshot: a proxy check result in Mosaic: latency, exit address, ISP, HTTPS tunnelling and reputation](https://mosaicbrowser.com/covers/multiple-accounts-on-the-same-ip-address.webp) An IP address is the public address your traffic leaves the internet from, and it is shared far more often than people assume. Your partner's Instagram and yours arrive from the same home router. Forty employees reach Gmail from one office address. A mobile carrier can put thousands of phones behind a handful of addresses. So multiple accounts on the same IP address is the ordinary state of the internet, and no platform can treat it as proof of anything by itself. ## Why so many people share one address There are not enough IPv4 addresses for every device, so networks share them. Your router gives each phone and laptop at home a private address and sends everything out through one public one. Carriers do the same thing a level up, with carrier-grade NAT. The block they use for it, `100.64.0.0/10`, was set aside in 2012 by [RFC 6598](https://www.rfc-editor.org/rfc/rfc6598) "to accommodate the needs of Carrier-Grade NAT (CGN) devices". Behind that, one public address can belong to a whole neighbourhood of customers. Google's own help page reflects this. When it shows a sign-in from a place you have never been, it says that "usually happens when you use your account on a mobile network, but it can happen on other networks as well" ([How IP addresses work on Google](https://support.google.com/accounts/answer/6076654?hl=en), read 2 November 2026). If Google cannot place a phone by its IP, it cannot assume two accounts on one IP are one person either. Mosaic is a desktop app Email yourself the link and open it on your computer. [How it works: Provider minting](https://mosaicbrowser.com/features/proxy-providers) ## When multiple accounts on the same IP address do matter The IP counts for more in three situations. ### The platform limits accounts Reddit says you are "more than welcome to create multiple Reddit accounts" ([Reddit Help](https://support.reddithelp.com/hc/en-us/articles/204535759-Is-it-ok-to-create-multiple-accounts), read 2 November 2026), so a shared IP there is irrelevant. X allows up to ten accounts "for different, non-duplicative purposes" ([X Help Center](https://help.x.com/en/rules-and-policies/authenticity), read 2 November 2026). A marketplace that allows one seller account per business reads the same address very differently. Mosaic keeps accounts you are entitled to run apart; it does not change what a platform allows. ### The accounts also share other things Platforms combine signals. One IP plus one browser, so the same cookies and the same fingerprint, plus the same payment card is one person by any reading. The IP is the cheapest of those signals to check and the weakest alone, which is why it is rarely the only one. The full set is in [how websites detect multiple accounts](https://mosaicbrowser.com/guides/how-do-websites-detect-multiple-accounts). ### The accounts belong to different businesses An agency signing in to twelve clients' ad accounts from one office address is a normal pattern, and the ad platforms built agency access for it. A freelancer who runs clients' shops from home is in the same position. The accounts belong to unrelated businesses, and the shared IP is the only reason they look connected. Some agencies prefer to give each client's work its own exit in the client's own country, so the platform sees the account where its business is. ## What a shared IP does not tell a site It does not tell a site that two accounts are on one computer. Ten laptops in a coworking space share an address and nothing else. Separate machines have separate fingerprints and separate cookies, which is why a single home with three people does not look like one user. That cuts the other way too. Giving each account its own IP while it runs in the same browser changes little, because the browser still reports one machine and may still carry the other account's cookies. A new address on top of a shared fingerprint is a half-fix: it changes the weakest of the three signals and leaves the other two. ## How to give each account its own address If the accounts should look as separate as they are, each one needs its own exit: 1. One proxy per account, not one proxy for all of them. A single proxy for every account is a shared IP again, just a different one. A VPN is the same: every app on the computer leaves from its exit. 2. An exit in the account's own region. An account that has always signed in from Manchester and suddenly appears from Texas has a new oddity, even if it is no longer sharing. 3. A sticky session. Residential proxies rotate unless told not to, and an account whose address changes every few minutes looks stranger than one that shares a home router. 4. A check before you sign in. A proxy sold as German can exit elsewhere. [Checking a proxy before you use it](https://mosaicbrowser.com/guides/how-to-check-a-proxy-before-you-use-it) covers the location, the blocklists and whether the address is residential. Chrome takes its proxy from the computer's network settings unless told otherwise, so every Chrome profile shares one, and step 1 is where most setups fall over. [Using a different proxy for each Chrome profile](https://mosaicbrowser.com/guides/use-a-different-proxy-for-each-chrome-profile) explains why Chrome makes this awkward and what works. ## Doing it in Mosaic Each Mosaic profile carries its own proxy, so accounts in different profiles never share an exit unless you give them the same one. With a proxy seller's gateway, paste one line in Proxies › Add provider and every profile mints its own session id, which means its own exit, chosen by country, state or city where the seller's line has a word for it. Mosaic checks the proxy before every launch and refuses to open a profile behind one that has not answered and tunnelled, so a failed proxy never quietly falls back to your home address. ![A proxy check result in Mosaic: latency, exit address, ISP, HTTPS tunnelling and reputation](https://mosaicbrowser.com/shots/proxy-check.png) *The exit a site will see, checked before launch* The profile's timezone and language are then set from where the exit actually is. The address is still only one signal: [the proxy providers page](https://mosaicbrowser.com/features/proxy-providers) shows the minting step, and the cookies, fingerprint and account details still need to be kept apart. ## Sources 1. [RFC 6598: IANA-Reserved IPv4 Prefix for Shared Address Space](https://www.rfc-editor.org/rfc/rfc6598), read November 2, 2026 2. [Google Account Help: How IP addresses work on Google](https://support.google.com/accounts/answer/6076654?hl=en), read November 2, 2026 3. [Reddit Help: Is it ok to create multiple accounts?](https://support.reddithelp.com/hc/en-us/articles/204535759-Is-it-ok-to-create-multiple-accounts), read November 2, 2026 4. [X Help Center: Authenticity](https://help.x.com/en/rules-and-policies/authenticity), read November 2, 2026 ## Questions ### Can two people in one home use the same platform on one Wi-Fi? Yes. Two people in one home have two accounts on one IP address every day, and platforms see that constantly. Each person's own account follows the platform's normal rules. ### Will a VPN give each account its own IP address? No. A VPN moves every app on the computer to one new address. All your accounts then share the VPN's exit instead of your home one, and that exit is shared with the VPN's other customers too. ### How do I see the IP address a site sees? Any what-is-my-IP page shows the public address your traffic leaves from. In Mosaic, each proxy check shows the exit address, its location and its ISP before a profile opens. ### Is a residential proxy better than a datacentre one for this? For consumer platforms, usually, because the exit belongs to a home connection. A datacentre address is fine for many jobs, but it tells a site the visitor is on a server. ## Related [How do websites detect multiple accounts?](https://mosaicbrowser.com/guides/how-do-websites-detect-multiple-accounts): Websites detect multiple accounts by what two accounts share: cookies, the IP address, the browser fingerprint, payment and phone details, and habits. [How to use a different proxy for each Chrome profile](https://mosaicbrowser.com/guides/use-a-different-proxy-for-each-chrome-profile): Chrome has no proxy setting per profile. Use a proxy extension in each profile, or launch Chrome with its own data folder and --proxy-server. [How to manage multiple accounts on one computer](https://mosaicbrowser.com/guides/manage-multiple-accounts-on-one-computer): Manage multiple accounts on one computer with the platform's own switcher, a browser profile or container per account, or an anti-detect browser for clients. [How to check a proxy before you use it](https://mosaicbrowser.com/guides/how-to-check-a-proxy-before-you-use-it): Check that a proxy answers and tunnels, where its exit really is, whether the address is residential or blocklisted, and that the browser stays behind it. [Residential proxy: an exit on a home internet connection](https://mosaicbrowser.com/glossary/residential-proxy): A residential proxy sends your traffic out through an address an ISP assigned to a home connection, so sites see a household rather than a data center. [Provider accounts: one gateway line, one exit per profile](https://mosaicbrowser.com/features/proxy-providers): Paste your proxy seller's gateway line once and Mosaic mints a separate session for every profile, so each one browses from its own exit address.   ## Run this guide on your own accounts Every Mosaic profile is a fingerprint, a proxy exit and a cookie jar that agree with each other, kept on your computer. Free holds 3 profiles. Pro is $49 a month for any number. Mosaic is a desktop app Email yourself the link and open it on your computer.