Every 'mobile proxy' claim is verified against the underlying ASN — and the gap between a real Tier-1 carrier IP and a datacenter IP wearing a mobile sticker decides whether you pass or get blocked. Here's how ASN classification, CGNAT reputation churn, MVNO drift, and carrier tiering actually work.
Every guide about mobile proxies eventually reduces to "buy mobile IPs, they don't get blocked." That was roughly true five years ago. In 2026 it's the wrong mental model, and it's why so many people buy "mobile proxies" that get instantly flagged by Cloudflare, DataDome, HUMAN, and Kasada.
The real unit that anti-bot vendors evaluate isn't the IP — it's the Autonomous System Number (ASN) that announces the IP, plus that ASN's rolling reputation. Two IPs that both start with 104. can live in wildly different neighborhoods: one on Verizon Wireless (AS22394, clean, trusted) and one on OVH (AS16276, hosting, flagged). Neither the IP number nor the "mobile proxy" label on your dashboard tells you which is which.
This is a working guide to what an ASN actually is, why detection engines rate them differently, how reputation is built and lost, what the carrier tiers look like in each major market, and — bluntly — how to tell if you're being sold a real carrier IP or a datacenter IP with a "mobile" sticker.
> Disclosure: we build xProxy — real-SIM 4G/5G mobile proxies on named carrier ASNs. This article is deliberately vendor-neutral about the technical detection side; the concepts apply to any provider, ours included.
An Autonomous System (AS) is any network on the internet that manages its own IP routing. Every AS has a globally unique Autonomous System Number (ASN) assigned by an RIR (ARIN in North America, RIPE in Europe, APNIC in Asia-Pacific, LACNIC in Latin America, AFRINIC in Africa).
Every public IP address on the internet is announced (via BGP) by exactly one ASN at any given time. You can look it up:
Or in Python:
Key insight: the ASN is a much stronger signal than the IP prefix, because reputation, category, and abuse history all attach to the ASN — not to any specific IP.
Every ASN on the internet has been classified by intelligence providers (IPinfo, MaxMind, Spur, IP2Location, ipdata) into a type. Anti-bot vendors buy this classification and apply per-type policies before your request even reaches TLS.
Typical type buckets:
| ASN type | Examples | Anti-bot treatment | |---|---|---| | mobile / cellular | AS21928 T-Mobile, AS22394 Verizon Wireless, AS12576 EE UK, AS15897 Vodafone DE | Trusted — assumed to be real subscribers, high CGNAT churn | | isp / residential | AS7922 Comcast, AS20115 Charter, AS2856 BT Retail | Trusted-ish — real users, but flag if IP appears in known scraping proxy pools | | business | Corporate leased lines | Neutral, unusual patterns get scored | | hosting / datacenter | AS16509 AWS, AS14061 DigitalOcean, AS16276 OVH, AS8075 Microsoft, AS15169 Google | Highly suspicious — challenges auto-served | | vpn | AS9009 M247 (many commercial VPNs), AS49505 Selectel | Flagged — VPN policies apply | | tor | AS4224, Tor exit relays | Almost always blocked | | education | Universities | Neutral | | government | Government ranges | Neutral |
The critical line for our purposes: mobile ASNs get baseline trust, hosting ASNs get baseline suspicion. If you have a "mobile proxy" that resolves to AS14061 DigitalOcean, you're getting hosting treatment regardless of what your provider called it in their dashboard. The reseller can call it whatever they want; MaxMind/IPinfo/Spur have already told Cloudflare/DataDome/HUMAN what it actually is.
The intelligence providers determine type from a few signals:
You can't fake most of these. That's why datacenter-to-mobile relabelling is so easy to detect — the RIR whois still says "OVH Hosting SAS," not "AT&T Mobility LLC."
Here's the mechanic that makes real mobile IPs so much more trust-friendly than any static residential or datacenter IP.
Mobile carriers don't have enough IPv4 addresses to give every subscriber a unique one. Instead they use Carrier-Grade NAT (CGNAT) — a small pool of public IPv4 addresses shared across thousands of subscribers, with the carrier's NAT translating between the internal private range and the public IP.