Is 223.75.121.218:12120 a proxy? Yes.
223.75.121.218:12120 is a public SOCKS4 proxy in the HProxy free proxy list, exiting from China. It holds an excellent 100% uptime with a high 3956ms response time, and was last checked 11 min ago.
uptime
ChinaUptime & downtime
1
Days tracked
9
Checks run
0%
Downtime
0
Down days
How this one compares
Reliable enough to sit in the top 5% 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 4,737 proxies answering right now, the middle of the pack answers 14.9% of the checks we send it.
100%
of 9 checks answered
Pool median 14.9%. 223.75.121.218:12120 is in the top 5%.
3956ms
on its last response
Pool median 3,066ms.
0
days tracked, still in the live pool
Of the 195,312 free proxies we have watched stop working, half were gone within 28 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 195,312 endpoints that stopped working.
Middle halfMedianFull range
How quickly one answers
Response time on the last successful check, across the 4,737 proxies answering right now.
Where this address sits
Right now our free pool holds 6 other free proxies on China Mobile, and 600 in China. 223.75.121.218:12120 sits inside that set, so if it is not usable the pages below are where its closest alternatives are. At 3956ms it answers faster than the 4078ms median for China proxies (about 97% of it).
China Mobile is the 108th 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 412 addresses on AS9808, which is 0.07% of every address in the database and a small corner of the database. That makes it the 108th largest source of free proxies of every network we have ever seen. 7 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 now2%
- Answered before10%
- Never answered89%
- 1LimitedNetwork-ASAS213790227,266
- 2Amazon.com, Inc.AS1650928,781
- 3Cloudflare, Inc.AS1333522,186
- 4SECURED SERVERS LLCAS2045419,475
- 5Cloudflare, Inc.AS20924214,141
- 6Alibaba (US) Technology Co., Ltd.AS4510211,709
- 7GloboTech CommunicationsAS3666611,542
- 8ChinanetAS41348,413
99 networks between
108China MobileAS9808411
How to use this proxy
Route a request through 223.75.121.218:12120 over SOCKS4. Free proxies are shared and rotate out fast, so test before you rely on it.
curl -x socks4://223.75.121.218:12120 \
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 223.75.121.218:12120
223.75.121.218:12120 is in the live pool right now, and it stays there only for as long as it keeps answering.
Port 12120: 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.
It has answered every single check
Each check opens a real connection to 223.75.121.218:12120 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. 223.75.121.218:12120 has completed that handshake on all 9 attempts so far, which is rare on a free public proxy and worth treating with some suspicion until the record is longer. The handshake is attempted across HTTP, HTTPS, SOCKS4 and SOCKS5, which is how we know it spoke SOCKS4 and SOCKS5.
9 checks, 9 answered
That is 100% of the time, measured since August 18, 2026. Every one of those results, successes and failures alike, is a connection HProxy opened itself.
It is being re-tested continuously
223.75.121.218:12120 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 223.75.121.218:12120, and nothing it does not.
- First seen
- August 18, 2026
- Last checked
- August 18, 2026
- Next check due
- continuously
- Checks run
- 9
- Times it answered
- 9
- Spoke
- SOCKS4, SOCKS5
100%
answered 9 of 9 checks
Questions about 223.75.121.218:12120
Is 223.75.121.218:12120 a working proxy right now?
Yes. 223.75.121.218:12120 answered HProxy's automated check 11 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 223.75.121.218?
It speaks SOCKS4, SOCKS5, and our checks grade it elite. The port is 12120. Point your client at 223.75.121.218:12120 over socks4 to route a request through it.
Where is 223.75.121.218 located?
Traffic through it exits from China, on China Mobile (AS9808). That is where the destination site will think your request came from.
How fast is 223.75.121.218:12120?
It answered in 3956ms 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 223.75.121.218:12120 been?
Across 1 day of tracking it answered 100% 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 223.75.121.218:12120?
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 China Mobile?
6 other free proxies are live on China Mobile (AS9808) in our pool right now, alongside 223.75.121.218:12120. 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, 600 free proxies are exiting from China in our pool right now, answering in 4078ms 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.
223.75.121.218:12120 has answered 100% 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.
Other live free proxies
View all →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.