Genuine 4G Proxy or Fake: 6 Checks for Carrier, ASN, and CGNAT Before Purchase

Arbitrage marketers and SMM specialists pay 3-5 times more for mobile proxies than for residential ones — and they don’t always get what they pay for. Under the guise of “real 4G,” sellers often sell regular residential IPs or even datacenter addresses with a fake name. We break down 6 technical checks that will take 10 minutes and show whether this is a real mobile IP from the operator or a fake.

Why a Fake Mobile Proxy is a Problem

Mobile proxies are valued for one thing — a shared IP address is used simultaneously by hundreds or thousands of real subscribers of the operator. This creates a natural “reputation” for the IP: platforms like Facebook Ads, TikTok Ads, and Instagram see such an address as regular home traffic, not as a proxy server. If instead of a real mobile IP you were sold a residential (home Wi-Fi) or, worse, a datacenter address with a fake name, you are getting a completely different risk profile.

The consequences for the arbitrage marketer are felt immediately: Facebook Ads accounts get banned faster than expected, TikTok Ads flags the traffic as suspicious, and the ad account goes into “review” without explanation. An SMM specialist managing 20-30 client Instagram accounts risks getting mass bans on several profiles at once if they are all “sitting” on one fake mobile IP that turned out to be a cheap datacenter address.

The problem is exacerbated by the fact that many proxy sellers know: buyers rarely check technical details. The name “4G/LTE proxy” in the price list guarantees nothing — independent verification is required.

What Makes a Proxy a “Real 4G”

A real mobile proxy is technically structured as follows: a physical device (modem, router, or smartphone farm) connects to the operator's network via a SIM card, receives a dynamic IP address from the operator's pool, and distributes traffic through a proxy server. Key signs of authenticity:

• The IP belongs to an Autonomous System (ASN) of a real mobile operator — MTS, Beeline, Vodafone, T-Mobile, not a hosting provider;
• The address is behind CGNAT technology — dozens of real subscribers are hidden behind one external IP;
• Latency (ping) and jitter correspond to mobile network characteristics, not a fiber-optic datacenter;
• When geolocating the IP, a city or region is determined, not the address of a hosting company;
• When changing IP (rotation), the new address is issued from the same operator's pool, not “jumping” between different hosting countries.

Next — specific steps on how to check each of these points without a single line of code.

Check 1: ASN and IP Range Owner

ASN (Autonomous System Number) is a unique number of the network to which the IP address belongs. Each mobile operator has its own ASN or several ASNs registered specifically to it. Datacenters and hosting providers have their own ASNs, and they can be easily distinguished by the name of the organization.

How to check: open the website bgp.he.net or ipinfo.io, paste the proxy IP address into the search field. In the results, you will see a field “Organization” or “ASN Name.” If it says “MTS PJSC,” “Beeline,” “Vodafone Group,” “T-Mobile USA” — that’s a good sign. If you see “DigitalOcean,” “OVH SAS,” “Hetzner Online,” “Amazon AWS,” or any name with “Hosting,” “Datacenter,” “Cloud” — you are looking at a datacenter address passed off as 4G.

Pay special attention to residential providers: if the ASN belongs to a home broadband ISP (e.g., Comcast, Deutsche Telekom as a fixed provider, Rostelecom), this is a residential IP, not a mobile one — also a quality option for many tasks, but not what you are paying the price of a 4G proxy for.

Check 2: Signs of CGNAT

CGNAT (Carrier-Grade NAT) is a technology that operators use to “fit” thousands of subscribers onto a limited pool of public IPv4 addresses. It is CGNAT that creates the effect of a “shared” IP, making mobile proxies appear as organic traffic — the platform sees the same address from hundreds of different real users simultaneously.

How to check for CGNAT: use the service whatismyipaddress.com/cgnat-test or check the IP range for belonging to the block 100.64.0.0/10 — this is a specially reserved block for CGNAT (RFC 6598). However, it is important to understand: most mobile operators use CGNAT at the internal network level, and the external IP that the site sees is already the operator's public address. Therefore, a direct way to check is to look in WHOIS how many addresses are “hanging” in the same /24 or /22 block and how often this specific external IP changes for different users simultaneously (this can be estimated through IP history on services like iphub.info).

If the proxy provider gives you an “exclusive” IP that is assigned only to you and is not found anywhere else, while claiming it is mobile 4G — this is a warning sign. Real mobile pools are always shared because that’s how CGNAT works at operators.

Check 3: WHOIS, rDNS, and Operator Name

In addition to ASN, it is worth checking the reverse DNS record (rDNS) of the IP address. Many operators have something like *.mobile.mts.ru, *.lte.beeline.ru, or similar patterns indicating “mobile,” “lte,” “3g,” “4g,” “wireless” in rDNS. You can check rDNS through the service mxtoolbox.com/ReverseLookup.aspx — just paste the IP.

Also, take a look at the standard WHOIS query (via whois.domaintools.com) — it specifies “NetName” and “Organization.” A real mobile range usually has a NetName like “MTS-MOBILE-NET” or “VODAFONE-LTE-POOL.” If the WHOIS mentions the name of a little-known proxy company or hosting provider with no connection to a telecom operator — you are likely being deceived.

An important nuance: some proxy sellers legally rent mobile traffic from operators through affiliate programs (this is a normal and working model), and in such cases, WHOIS will still show the operator, not the proxy company, because the IP physically belongs to the telecom provider, just routed through the seller's proxy server.

Check 4: Speed, Latency, and Jitter

A real 4G/LTE connection has a characteristic “mobile” network profile: latency (ping) is usually higher than that of a datacenter fiber, and there is jitter — fluctuations in latency from packet to packet. A datacenter IP almost always shows a stable low ping (1-15 ms to nearby servers) and minimal jitter because it is a dedicated server with a wired connection.

How to check: connect the proxy in an anti-detect browser or through a terminal and perform a test on speedtest.net or fast.com. Pay attention to three parameters:

• Latency (ping) 30-80 ms — typical for mobile networks; less than 10 ms — suspicious, looks like a datacenter near the test server;
• Jitter above 5-10 ms — normal for LTE, stable 0-1 ms — a sign of wired connection;
• Upload/download speed fluctuates from test to test — characteristic of a real mobile network with variable base station load.

This method does not provide a 100% guarantee by itself, but in combination with the ASN check, it excellently confirms or disproves the claimed type of proxy.

Check 5: Online IP Check Services

There are specialized services that aggregate ASN data, connection type (mobile/broadband/hosting), and the risk score of the IP address. The most useful for this task are:

• ipqualityscore.com — directly indicates “Connection Type: Mobile” or “Data Center” and provides a fraud score;
• whoer.net — shows the provider, IP type, and presence in blacklists;
• ip-score.com — assesses the likelihood that the IP is used as a proxy/VPN;
• iphub.info — marks the IP as “Residential/Mobile” (block: 0) or “Non-residential/Hosting” (block: 1).

Practice shows: if at least 2 out of 4 services mark the IP as “Data Center” or “Hosting,” and not “Mobile” or “Cellular,” the seller has deceived you. Check not just one IP from the pool, but at least 5-10 different addresses — sometimes sellers mix in some real mobile IPs with the main datacenter pool to pass the test successfully.

Check 6: Behavior During IP Rotation

The last and most practical check is to see how the proxy behaves during rotation. Request the seller to change the IP (or wait for automatic rotation) and repeat checks 1-3 for the new address. In a real mobile pool, the new IP almost always belongs to the same operator and the same region — just a different base station or another subscriber from the same CGNAT pool.

If after rotation the ASN suddenly changes from “MTS Mobile” to “DigitalOcean” or the country jumps from Russia to the Netherlands without any apparent reason — this is a clear sign that the provider mixes different types of IPs in one pool and sells this as “mobile proxies.” Such instability is especially dangerous for SMM agencies: an Instagram account tied to a Russian number suddenly logs in with a Dutch datacenter IP — a direct path to blocking for “suspicious activity.”

Table: Mobile vs Residential vs Datacenter Proxies

Parameter	Mobile Proxies	Residential Proxies	Datacenter Proxies
ASN	Telecom Operator (MTS, Vodafone)	Home ISP (Rostelecom, Comcast)	Hosting (OVH, Hetzner, AWS)
CGNAT	Yes, always	Rarely	No
Latency	30-100 ms, jitter present	15-60 ms	1-15 ms, stable
Trust Level of Platforms	Maximum	High	Low, often in blacklists
Best Task	Facebook/TikTok Ads, banking services	SMM, Instagram, marketplace scraping	Mass scraping without strict anti-fraud protection

How to Check Proxies Directly in Dolphin Anty or AdsPower

It is more convenient to check proxies directly in the anti-detect browser where you will be working with them — this way you immediately see the real fingerprint of the profile. The algorithm for Dolphin Anty, AdsPower, Multilogin, or GoLogin is roughly the same:

1. Create a new profile → go to the “Proxies” section → select SOCKS5 or HTTP type and paste the data (IP, port, username, password);
2. Click the “Check Proxy” button — most anti-detects immediately show the country, city, and provider based on ASN data;
3. Launch the profile and open a tab on ipinfo.io or whoer.net right inside the profile;
4. Compare the “Organization”/“ISP” field with the name promised by the proxy seller;
5. Check for WebRTC leak — in some anti-detects, this check is built into the fingerprint report, ensure that the real IP does not “leak” through WebRTC.

If the anti-detect browser itself identifies the proxy as “Datacenter” or “Hosting” in the automatic report — trust this assessment, it is based on the same ASN databases that you would check manually.

Checklist Before Buying Mobile Proxies

Conclusion

The difference between a real mobile proxy and a fake is not always visible at first glance — but the 6 checks from this article (ASN, CGNAT, WHOIS/rDNS, speed and jitter, online services, behavior during rotation) take no more than 10-15 minutes and protect against losing advertising budget due to unexpected bans. The rule is simple: never pay for a large proxy package without prior verification of at least one test IP using the described methodology.

If you really need maximum similarity to organic traffic for Facebook Ads, TikTok Ads, or banking accounts — choose mobile proxies with transparent ASN ties to the operator. For SMM tasks and managing dozens of Instagram or TikTok accounts, where stability and price are more important than the maximum level of platform trust, residential proxies are an excellent choice. And for mass scraping of marketplaces without strict anti-fraud systems — datacenter proxies, which provide maximum speed at minimal cost.