Is 123.57.213.24:3539 a proxy? Yes.
123.57.213.24:3539 is a public HTTP proxy in the HProxy free proxy list, exiting from China. It holds a strong 92% uptime with a high 2754ms response time, and was last checked 16 min ago.
ChinaHow this one compares
Reliable enough to sit in the top quarter of everything we are watching.
Every free proxy list quotes an uptime figure. Almost none of them tell you what a normal one looks like, so here is ours: across the 6,029 proxies answering right now, the middle of the pack answers 24.9% of the checks we send it.
92%
of 4,361 checks answered
Pool median 24.9%. 123.57.213.24:3539 is in the top quarter.
2754ms
on its last response
Pool median 7,725ms, so this one is roughly 3x quicker than typical.
69
days tracked, still in the live pool
Of the 279,722 free proxies we have watched stop working, half were gone within 26 days of us first seeing them.
What normal looks like
Every number above is measured against these two.
A percentage on a proxy list means nothing without the shape of the thing it came from. These are the two distributions the rest of this page compares against, drawn from HProxy's own checks rather than from anybody's marketing page.
How long one lasts
Days from the first time we saw an address to the last time it answered, across 279,722 endpoints that stopped working.
Middle halfMedianFull range
How quickly one answers
Response time on the last successful check, across the 6,029 proxies answering right now.
Where this address sits
Right now our free pool holds 25 other free proxies on Alibaba, and 569 in China. 123.57.213.24:3539 sits inside that set, so if it is not usable the pages below are where its closest alternatives are. At 2754ms it is slower than the 2334ms median for China proxies.
Hangzhou Alibaba Advertising Co.,Ltd. is the 19th largest source of free proxies we have ever measured.
Open proxies cluster rather than spreading evenly across the internet. Hosting providers and cloud platforms run enormous numbers of near-identical servers, so a handful of networks end up carrying a disproportionate share of every public proxy list, including ours. HProxy tracks 4,310 addresses on AS37963, which is 0.55% of every address in the database and a meaningful pocket of the database. That makes it the 19th largest source of free proxies of every network we have ever seen. 26 of them are answering right now, so if this particular address is not usable, the network is a reasonable place to look for one that is.
- Answering now1%
- Answered before55%
- Never answered45%
- 1LimitedNetwork-ASAS213790227,474
- 2SECURED SERVERS LLCAS1943779,187
- 3SECURED SERVERS LLCAS2045447,629
- 4Amazon.com, Inc.AS1650944,546
- 5Cloudflare, Inc.AS1333522,925
- 6M247AS900922,204
- 7Cloudflare, Inc.AS20924214,275
- 8Alibaba (US) Technology Co., Ltd.AS4510212,260
10 networks between
19Hangzhou Alibaba Advertising Co.,Ltd.AS379634,310
How to use this proxy
Route a request through 123.57.213.24:3539 over HTTP. Free proxies are shared and rotate out fast, so test before you rely on it.
curl -x http://123.57.213.24:3539 \
https://api.ipify.org?format=json
Not a terminal person? Pick your device and we walk you through it, nothing assumed.
Continuous monitoring
How HProxy checks 123.57.213.24:3539
123.57.213.24:3539 is in the live pool right now, and it stays there only for as long as it keeps answering.
Port 3539: Registered port range
This port sits in the middle range, where any ordinary program can listen without special permission. The number itself carries no reserved meaning, which tells you somebody picked it on purpose instead of accepting a default.
Every check is a real connection
HProxy does not read this address off somebody else's list and pass it on. Each check opens a real connection to 123.57.213.24:3539 and gives it up to 90 seconds to answer. Slow is not the same as unreachable, and plenty of working proxies take half a minute to reply. Anything that does not answer in that budget counts as a failure and is recorded as one, which is why the percentage on this page moves rather than sitting at a marketing number. The handshake is attempted across HTTP, HTTPS, SOCKS4 and SOCKS5, which is how we know it spoke HTTP.
4,361 checks, 4,030 answered
That is 92% of the time, measured since July 8, 2026. Every one of those results, successes and failures alike, is a connection HProxy opened itself.
It is being re-tested continuously
123.57.213.24:3539 is in the live rotation, so it is re-tested continuously rather than on a daily cycle. If it stops answering it is marked down immediately, and if it stays down for 3 days it moves into the public proxy database with its full record intact. Nothing is deleted at any point.
This endpoint
The record
Everything HProxy holds on 123.57.213.24:3539, and nothing it does not.
- First seen
- July 8, 2026
- Last checked
- September 15, 2026
- Next check due
- continuously
- Checks run
- 4,361
- Times it answered
- 4,030
- Spoke
- HTTP
92%
answered 4,030 of 4,361 checks
Questions about 123.57.213.24:3539
Is 123.57.213.24:3539 a working proxy right now?
Yes. 123.57.213.24:3539 answered HProxy's automated check 16 min ago and is in the live free proxy pool as we publish this page. It is re-tested every few minutes, so open this page again for its current state rather than trusting a copy of it.
What kind of proxy is 123.57.213.24?
It speaks HTTP, and our checks grade it transparent. The port is 3539. Point your client at 123.57.213.24:3539 over http to route a request through it.
Where is 123.57.213.24 located?
Traffic through it exits from Beijing, China, on Hangzhou Alibaba Advertising Co.,Ltd. (AS37963). That is where the destination site will think your request came from.
How fast is 123.57.213.24:3539?
It answered in 2754ms on the last check. Free public proxies are shared, so real-world speed varies with how many other people are using it at the same moment.
How reliable has 123.57.213.24:3539 been?
Across 70 days of tracking it answered 92% of our checks. The chart on this page shows every day we have recorded for it, including the days it was down.
Is it safe to use 123.57.213.24:3539?
Treat it the way you would any public proxy: it is operated by someone we have no relationship with, it is shared with strangers, and anything you send unencrypted over it can be read. Fine for a quick geo check or a scrape of public data, never for logins, payments or anything private.
How many free proxies are on Alibaba?
25 other free proxies are live on Alibaba (AS37963) in our pool right now, alongside 123.57.213.24:3539. Networks that host one open proxy usually host several, which is why the whole AS is worth browsing rather than just this address.
Are there other free proxies in China?
Yes, 569 free proxies are exiting from China in our pool right now, answering in 2334ms at the median. If this address is not usable, that list is the place to look for a working one.
Where to go next
Upgrade to the paid network
This one is good, and it will still disappear.
123.57.213.24:3539 has answered 92% of our checks, which puts it well above most of what we track. It is still a public endpoint with nobody standing behind it: nobody agreed to serve you, no capacity is set aside for you, and there is no warning on the day it stops. Fine for a test, a bad foundation for anything that has to work tomorrow.
About this list & IP removal
Every proxy here is aggregated from publicly available sources. We do not scan or collect these IP addresses ourselves: we verify entries that are already public (live status, latency, uptime) and store nothing else about the devices behind them. The list is provided as-is, with no warranty, for lawful use only, on the basis of our legitimate interest in a free, transparent proxy directory (Art. 6 (1) (f) GDPR). Never route passwords or sensitive data through a public proxy. If an IP address is yours and you'd like it removed, email legal@hproxy.com and we'll take it down (Art. 21 GDPR). Full details on the report abuse page.