AT&T Lines: Network Facts for Developers

An AT&T line from Mobile Proxies US exits on an address owned by AT&T Mobility, autonomous system AS20057, from a SIM in a device we run in one of eight US metros. In GET /proxies/my it is a licence with carrier AT&T, a city, a network tier, a host and ports, a login and a rotation link. This page records what a developer needs to know about AT&T addresses specifically: how they are identified, how they are shared, where they geolocate, how rotation behaves and what the line costs.

Identification

A reverse lookup or an ASN query on the exit IP returns AT&T Mobility, AS20057, country US. Connection-type fields in geolocation and reputation services read mobile or cellular. The address is IPv4 at the proxy exit. Your tests should assert the ASN and the connection type; these two fields are what destination sites use to put the request in the mobile bucket.

Shared by design

AT&T places many handsets behind each public IPv4 address through carrier-grade NAT. The exit IP of your line is also the address of other AT&T subscribers in the same region at the same moment. Consequences: reputation scores reflect the crowd rather than your traffic; destinations are reluctant to block the address because they would block their own customers; a returning address in their logs is ordinary. Your line is still exclusive to you at the device and SIM level; sharing happens one layer up, at the carrier.

Geolocation behaviour

Country and state resolve correctly in every metro. City resolution is usually the metro itself, with one documented exception: AT&T's New England traffic exits through its New York gateway, so an AT&T line in Boston reads as New York in most databases (a Verizon line in Boston reads as Boston). Elsewhere, an occasional regional reading is possible after AT&T re-plans address blocks and databases lag. Assert country and state in code; log the city.

Rotation semantics on AT&T

A rotate request (a GET on rotation_link, the dashboard, the bot or the timer) makes the modem drop and re-attach its data session. AT&T assigns a new address from the pool serving that gateway, typically within a few seconds, occasionally up to about half a minute under load. Do not retry a rotation that is still running. The address is sticky when left alone, for as long as AT&T's network keeps the session, which is normally hours. There is no limit on how many rotations you make; min_time_change_ip gives the wait the rotation link holds a line to, and phone lines have their own cooldown of 1 to 2 minutes.

Endpoints and protocols

Each AT&T line has an HTTP(S) endpoint, a SOCKS5 endpoint (TCP and UDP), a username and password, and a VLESS link for an encrypted tunnel. Both proxy ports share the same exit IP; a rotation changes it for both. Use socks5h in clients so DNS resolves on the carrier side. Chromium-based headless browsers take the HTTP endpoint with credentials passed at launch, or a local unauthenticated SOCKS port from an xray gateway built from the VLESS link.

Metros, devices and speed

AT&T lines are available in New York, Los Angeles, Chicago, Houston, Phoenix, Miami, Boston and North Carolina. The device is a 4G or 5G USB modem, a cellular router or an Android phone, chosen at checkout. 4G reads up to 25 Mbps download, 5G up to 50 Mbps; both vary with cell load. The 5G+ add-on, on 5G lines only, describes an average of 70 Mbps or more download on selected lines and is not guaranteed. Moves between metros are free and keep the remaining time.

When AT&T is the right carrier

Reproducing a report from an AT&T user. Jobs where a widely used consumer carrier with ordinary reputation is wanted and metro-exact city strings are not essential. Tests that need AS20057 specifically. If the job needs the city to read the metro reliably, T-Mobile is the better buy; if a report names Verizon, buy Verizon.

Prices and access

4G: $5 a day, $29 a week, $66 a month. 5G: $6 a day, $33 a week, $77 a month. Hourly: 4G $2 for the first two hours then $2 an hour, 5G $3 then $3 an hour, up to four hours, never renewing, with the hours counting toward a day plan if the line is kept all day. Pay by card, PayPal, Bitcoin, USDT including TRC-20, Ethereum, Zelle or bank wire. The line is live when payment clears and appears in the dashboard at cp.mobileproxiesus.com and in GET /proxies/my immediately.

AT&T proxy questions