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How Mobile Proxy IPs Work

In short

Why sites trust them

Mobile carriers let many real phones share one IP (CGNAT (carrier-grade NAT) means a mobile carrier lets many phones share the same public IP addresses. That is why websites rarely block a mobile IP.). A site cannot block that An IP address is the number that tells a website where a connection comes from. It works a bit like a return address. without blocking real people.

What sites see

A normal phone user on a mobile network. Not a A proxy is a middleman. Your app sends its traffic to the proxy, and the proxy passes it on to the website. The website sees the proxy’s IP address instead of yours., and not a server.

New IP on demand

Rotating means getting a new IP for the same proxy. The modem reconnects to the mobile network and gets another address, and your proxy settings do not change. and the modem reconnects. The carrier gives it a new IP in seconds. Your proxy port stays the same.

Why websites trust mobile IPs

A carrier has far more customers than public IPs. So it makes many phones share each IP. Your modem is one of those phones.

Many phones share one carrier IPSix phones on the same mobile carrier connect through one carrier network that shows a single shared IP address, 172.58.12.34 (demo data), to a website. If the website blocks that IP, every real phone behind it is blocked too, so sites rarely do it.T-Mobile USA · one shared IP172.58.12.34Block this IP?IP blockedYour modemwebsite.examplewebsite.exampleWelcome backAccess deniedUnusual traffic from your networkError 403

Everyday traffic: thousands of phones share one carrier IP, and the site sees normal visitors.

Illustration · demo data
  1. Everyday traffic: thousands of phones share one carrier IP, and the site sees normal visitors.
  2. Block this IP?
  3. Real customers blocked too. Every phone behind the IP is turned away.
  4. So sites rarely block mobile IPs.

The highlighted phone is your modem. CGNAT (carrier-grade NAT) means a mobile carrier lets many phones share the same public IP addresses. That is why websites rarely block a mobile IP. puts every phone behind one IP, so blocking the IP blocks them all. That is why sites rarely do it, and why a mobile IP is trusted.

How a website scores an IP

Before a site trusts a visitor, it runs a few checks on the IP and on the connection. Watch the same visit from a datacenter IP and from a mobile IP. To run a real check, open whoer.net through your proxy.

Check
Datacenter IP203.0.113.45Hosting Ltd (datacenter)
Mobile IP172.58.12.34T-Mobile USA
Network typeWhose network is the IP on?
Red flag: Hosting company’s network
Good sign: Mobile carrier’s network
Who shares itHow many real users sit behind it?
Red flag: Servers only, no real people
Good sign: Many real phones (CGNAT)
Abuse historyIs the IP on a blacklist?
Red flag: On a blacklist (demo)
Good sign: Not on a blacklist (demo)
Browser matchDo DNS and time zone fit the IP?
Red flag: DNS 8.8.8.8 does not fit the IP
Good sign: DNS 172.58.0.53 fits the IP
Connection fingerprint (TCP/OS)Does the TCP fingerprint match the browser’s OS?How?
Red flag: TCP says Linux, browser says Windows
Good sign: TCP/OS spoofing: Windows matches
The verdictWhat the site does
website.examplewebsite.exampleWelcome backAccess deniedUnusual traffic from your networkError 403Looks like a real person30%Proxy detected · datacenter IP
website.examplewebsite.exampleWelcome backAccess deniedUnusual traffic from your networkError 403Looks like a real person100%Looks like a real mobile user

The verdict: the datacenter IP is challenged or blocked. The mobile IP loads like any phone.

Illustration · demo data

How rotation gives you a new IP

Think of your proxy port as a road and the IP as the house at its end. Rotating moves you to a new house. The road stays the same, so nothing changes in your app.

  1. You ask for a new IPClick Rotate, set a timer, or call the API from your script.
  2. The modem reconnectsIt drops its mobile connection and joins the carrier network again. This takes a few seconds.
  3. The carrier gives it a new IPThe carrier hands out an address from its own pool. Your proxy port stays the same.
Rotation: a new IP behind the same proxy portYour app connects to the fixed proxy port :4001 of your modem. When you rotate, the modem loses its signal and reconnects, and the carrier gives it a new IP from its IP pool: 172.58.12.34 is replaced by 172.58.97.201 (demo data). The port stays the same.Your appyour-appWelcome backAccess deniedUnusual traffic from your networkError 403Your appPort stays the samewhoer.netWHOERMy IP172.58.12.34Dallas / United StatesISPT-Mobile USAProxyNoBlacklistNoNo proxy detectedMobile network

Your app uses one fixed proxy port. Traffic flows through your modem.

Illustration · demo data

Before: 172.58.12.34. After: 172.58.97.201. Proxy port: :4001, unchanged. Demo data.

IPv4 and IPv6. Most proxies use IPv4. If your carrier also supports IPv6, XProxy adds IPv6 ports next to them. Sometimes the carrier gives back the same IP. XProxy can flag that so you can rotate again.

All the ways to rotate: button, timer and API →

Mobile vs residential vs datacenter

What to compareDatacenterResidentialMobile
Where the IP comes fromA server in a data centerA real home internet lineA real SIM on a 4G/5G network
Who sits behind the IPOnly servers, no real peopleOne householdMany real phones, thanks to CGNAT
How sites treat itLow trust. A site can block the whole data center rangeMedium to high trust. Blocking it only affects one householdHighest trust. Blocking it would also block real phone users
Getting a new IPFixed. You need another proxyDepends on the providerRotate: the modem reconnects and gets one in seconds
What about the price? A mobile proxy needs a modem and a SIM plan, so renting one costs more than a datacenter proxy. Owning one is a different story: see what it costs →

What next?

Still stuck?A technician can look at your device with a one-time PIN, or chat with us on Telegram.
Remote supportTelegram @xproxyio