T-Mobile proxies — live AS21928 mobile exits across the US

What T-Mobile is now, versus what it was in 2019

The T-Mobile most US retail and ad-tech integrity stacks score in 2026 is the post-Sprint merger entity. The April 2020 merger folded Sprint's subscriber base, 2.5 GHz spectrum, and tower footprint into AS21928, and the next three years saw the carrier decommission the legacy Sprint core and re-announce most of the combined pool under T-Mobile's own ASN. As of this writing, Sprint's old public-IP allocations are effectively gone; the carrier you are buying exits on through Proxaro is the current AS21928 fabric.

As of 2025 Q3 reporting, T-Mobile overtook Verizon in total US wireless subscribers — the first year in modern telecom history that either carrier has held that position over Verizon. Industry estimates put T-Mobile at roughly 35% of US wireless retail connections; Verizon at ~34%; AT&T at ~27%. The integrity-scoring implication: T-Mobile is the most statistically-common "real user" carrier signal on US-originating mobile traffic.

The AS21928 footprint

AS21928 announces approximately 12 million IPv4 addresses across ~491 IPv4 prefixes and ~410 IPv6 prefixes per peeringdb as of 2025. That's among the largest single-ASN announcements on the public internet — a scale that matters because per-IP rate-limiting from a target against a CGNAT address takes down thousands of real phones per block. Serious US targets accordingly do not block T-Mobile IPs en masse; the blast radius is unacceptable.

T-Mobile's CGNAT pool mechanics:

• Per-IP subscriber count: typically 4,000–20,000 real users behind a single public IPv4 address, depending on market density and time of day. T-Mobile runs wider pools than Verizon or AT&T in dense metros.
• IPv6 default: the carrier's 5G SA core assigns IPv6 first, falling back to IPv4 via 464XLAT for v4-only destinations. If your target accepts IPv6, a T-Mobile SA exit gets you there natively.
• Rotation cadence: every tower handshake can change the public IP your subscriber CGNAT's through. Sticky sessions on T-Mobile hold in practice up to ~20 min; Proxaro documents 15 to be honest.

Where T-Mobile is strongest

T-Mobile's coverage advantage is clearest in:

• Urban standalone 5G: the carrier hit continuous SA coverage in every major metro first. NYC's five boroughs, LA's full basin, Seattle-Tacoma, Denver, Phoenix, Chicago, Miami, Atlanta, Dallas, Houston, San Diego — all have live T-Mobile SA as of 2025.
• Post-Sprint 2.5 GHz mid-band: the 2.5 GHz layer T-Mobile inherited from Sprint now runs across most of the country and delivers the best capacity-to-latency tradeoff of any US mobile carrier.
• Low-band 600 MHz rural reach: when carriers compare LTE coverage maps, T-Mobile's 600 MHz footprint is the one that surprised Verizon in the 2022–2024 competitive reset.

For Proxaro purposes, T-Mobile is the right pick when:

• You want the highest-volume US mobile trust signal on retail / adtech integrity stacks
• Your target accepts IPv6 and you want native v6 routing
• You're working against TikTok or Instagram US and want the ASN those platforms weight as canonical mobile

T-Mobile and TikTok / Instagram 2026

T-Mobile has been the carrier-of-record for a disproportionate share of US TikTok and Instagram creator traffic for two reasons: a large millennial + Gen-Z subscriber base, and the CGNAT scale that makes platform-level IP blocking of T-Mobile allocations untenable. Meta's 2025 integrity rollout specifically distinguishes "carrier ASN + carrier DNS + carrier route" from "carrier ASN announced via third-party path," and T-Mobile exits that route through the legitimate T-Mobile core clear that check cleanly.

MVNOs on T-Mobile

Mint Mobile, Metro by T-Mobile, Google Fi, and a tier of regional resellers ride on T-Mobile's host network. They announce under their own ASNs but route through the same eNodeBs and core. Some platforms down-score Mint and Metro explicitly; others weight them the same as T-Mobile. Proxaro's T-Mobile pool is host-carrier-only by default; pass carrier-host-only=false if you want MVNO pass-through included.

Pricing and pool access

T-Mobile ASN pinning is available on Carrier and above. Recommended starting state pools: Washington (T-Mobile's home state), California, Texas, Florida, New York.

References

• peeringdb.com — AS21928 T-Mobile USA, Inc. network details
• bgp.tools AS21928 — prefix announcement inventory
• Statista: "Largest US network operators market share 2025"
• T-Mobile investor reports Q3 2025 — subscriber net-add figures