How to check a mobile proxy’s carrier and ASN before you trust it

A provider hands you a host, a port, a username, a password, and the word mobile somewhere on the page. None of that proves the ip you are about to route traffic through belongs to a real phone on a real carrier. There is one check that settles it, and it takes about a minute.

I run a hardware proxy farm in Singapore, real phones on real sims from Singtel, M1, and StarHub. So when someone asks me whether an ip is actually mobile, I do not read the label. I read who owns the network behind the ip, because the network registry does not lie even when the sales page does.

What an asn actually is

An asn is an autonomous system number. It is a number that identifies a network on the internet, and every block of ip addresses is announced to the world by some network that owns an asn and a registered name. Singtel has one. A cloud hosting company has one. The asn is the registered identity of whoever actually runs the wires your traffic exits through.

That matters because when you use a proxy, the website you visit sees the exit ip, looks up its asn, and from that asn knows the network owner. A real mobile carrier and a datacenter host have completely different asns. So the asn behind your exit ip tells the site, and tells you, who is really hosting your connection.

Reading the owner with a whois or asn lookup

Route your traffic through the proxy, hit a neutral ip intelligence endpoint, and read back the exit ip and the network owner it reports. Then run a whois or an asn lookup on that ip and read the organization field straight from the registry. You are looking for one thing only, who owns this block of addresses.

curl -x http://user:pass@host:port https://ipinfo.io
whois 203.0.113.45 | grep -i org

A real Singapore mobile proxy comes back owned by a carrier. You will see Singtel, M1, or StarHub in the organization name, on the asn those carriers announce their mobile ranges from. That is what a genuine mobile exit looks like from outside, a carrier name, on a carrier asn, in the country you paid for.

The datacenter tell

Now run the same lookup on a datacenter ip wearing a mobile label. The organization comes back as a cloud provider, a hosting company, or some server brand you know from renting virtual machines. The word mobile is nowhere in the registry. It was only ever on the sales page. That mismatch, a hosting asn under a mobile label, is the single clearest tell that the so called mobile proxy is just a datacenter ip with a sticker on it.

This is not a small ripoff. The only thing you are really buying from a mobile proxy is the reputation of the ip. Sites trust an address full of real subscribers far more than a rack of servers, so a datacenter ip gets blocked where a carrier ip gets through. If you paid mobile prices and the asn says hosting, you got the wrong product, and it fails at the exact moment you needed it.

Why the ip-type databases are only a hint

A lot of tools hand you a tidy field that just says mobile, residential, or hosting. That is a useful first read, but those databases are guesses built from patterns, and they can be wrong or stale. A block can change hands, a carrier can reassign ranges, and the database can lag reality for months.

The asn is harder to fake than the type label, because it comes straight from how the network announces itself, not from a third party classifying it after the fact. So when the type field and the asn disagree, believe the asn and read the registered owner of the block. That is the closest thing to ground truth you can get from outside the network.

Check again after it rotates

Here is the part most people miss. Checking the asn once, on your first request, is not enough. A mobile proxy rotates on purpose, the ip changes the way a real phone changes address on the carrier. So the real test is what the ip looks like after a rotation, not just on the first connection.

Pull the exit ip and check the asn, then force or wait for a rotation and check the asn on the new ip. A real mobile proxy keeps landing on the same carrier, the same family of asns, because every one of those ips is a real phone on the same network. If the first ip is a clean carrier asn but after rotation it jumps to a hosting asn, you caught a pool that is part real and part datacenter, and you only saw it because you checked twice.

The repeatable routine

This is the routine I would run on any provider, including mine:

1. route through the proxy and hit a neutral endpoint to read the exit ip and reported owner
2. run a whois or asn lookup on that ip and read the organization field from the registry
3. force or wait for a rotation, then run the same two lookups again
4. confirm every exit lands on a real carrier asn and never on a hosting asn

The tools are boring and free, which is the point. A command line whois, a public ip intelligence endpoint that returns the asn and owner, or any web asn lookup that takes an ip and shows the announcing network. You need the exit ip and one minute.

Why this one check is enough

Almost every other claim a seller makes is hard to verify from outside. This one is not. The asn is public, it is registered, and it is the same answer the websites you care about will read. Run this check and a mislabeled proxy has nowhere to hide. You stop trusting the word mobile and start trusting the network registry, which marketing cannot edit.

If you want to run this against a real Singapore mobile farm, that is what I offer, real sg mobile ips on Singtel, M1, and StarHub, sticky sessions that hold an ip for as long as your task needs, and dns that routes through the tunnel so nothing leaks around it. Start a free trial and use code YT30. Run the whois yourself, read the carrier asn, confirm it stays on a carrier after rotation, and only then decide to trust it. I would rather you verify my ips than take my word for it.

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