Is 1.231.81.166:3128 a proxy? Yes.
1.231.81.166:3128 is a public HTTP proxy in the HProxy free proxy list, exiting from South Korea. It holds an excellent 99% uptime with a high 1132ms response time, and was last checked 17 min ago.
uptime
South KoreaOther ports on this IP
1.231.81.166 is answering on 1 ports right now.
Ports like this one rarely travel alone. We hold 2 of them on 1.231.81.166 and have run 7,530 checks against them since May 13, 2026. When an address turns up on public lists across this many ports, each port is published as its own entry, so each one gets its own record here.
Best responding ports
Best on this IP is 1.231.81.166:3128 at 99.0% across 7,445 checks
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 5,756 proxies answering right now, the middle of the pack answers 28.8% of the checks we send it.
99%
of 6,170 checks answered
Pool median 28.8%. 1.231.81.166:3128 is in the top 5%.
1132ms
on its last response
Pool median 8,072ms, so this one is roughly 7x quicker than typical.
126
days tracked, still in the live pool
Of the 280,561 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 280,561 endpoints that stopped working.
Middle halfMedianFull range
How quickly one answers
Response time on the last successful check, across the 5,756 proxies answering right now.
Where this address sits
Right now our free pool holds 1 other free proxy on SK Broadband, and 74 in South Korea. 1.231.81.166:3128 sits inside that set, so if it is not usable the pages below are where its closest alternatives are. At 1132ms it answers faster than the 2236ms median for South Korea proxies (about 51% of it).
How many free proxies are on SK Broadband Co Ltd
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 143 addresses on AS9318, which is 0.02% of every address in the database and a small corner of the database. 2 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 before14%
- Never answered85%
- 1LimitedNetwork-ASAS213790227,474
- 2SECURED SERVERS LLCAS1943779,187
- 3SECURED SERVERS LLCAS2045448,087
- 4Amazon.com, Inc.AS1650944,562
- 5M247AS900926,530
- 6Cloudflare, Inc.AS1333522,925
- 7Cloudflare, Inc.AS20924214,275
- 8Alibaba (US) Technology Co., Ltd.AS4510212,267
- AS9318 sits outside the 250 largest networks we hold.
How to use this proxy
Route a request through 1.231.81.166:3128 over HTTP. Free proxies are shared and rotate out fast, so test before you rely on it.
curl -x http://1.231.81.166:3128 \
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 1.231.81.166:3128
1.231.81.166:3128 is in the live pool right now, and it stays there only for as long as it keeps answering.
Port 3128: Squid default
Port 3128 is the default for Squid, the most widely installed proxy software in the world. Most addresses published on 3128 are Squid servers that were meant to serve one office or one network and ended up reachable by everybody.
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 1.231.81.166:3128 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 and HTTPS.
6,170 checks, 6,127 answered
That is 99% of the time, measured since May 13, 2026. Every one of those results, successes and failures alike, is a connection HProxy opened itself.
It is being re-tested continuously
1.231.81.166:3128 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 1.231.81.166:3128, and nothing it does not.
- First seen
- May 13, 2026
- Last checked
- September 16, 2026
- Next check due
- continuously
- Checks run
- 6,170
- Times it answered
- 6,127
- Spoke
- HTTP, HTTPS
99%
answered 6,127 of 6,170 checks
Questions about 1.231.81.166:3128
Is 1.231.81.166:3128 a working proxy right now?
Yes. 1.231.81.166:3128 answered HProxy's automated check 17 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 1.231.81.166?
It speaks HTTP, HTTPS, and our checks grade it transparent. The port is 3128. Point your client at 1.231.81.166:3128 over http to route a request through it.
Where is 1.231.81.166 located?
Traffic through it exits from Dongdaemun, South Korea, on SK Broadband Co Ltd (AS9318). That is where the destination site will think your request came from.
How fast is 1.231.81.166:3128?
It answered in 1132ms 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 1.231.81.166:3128 been?
Across 86 days of tracking it answered 99% 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 1.231.81.166:3128?
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 SK Broadband?
1 other free proxy is live on SK Broadband (AS9318) in our pool right now, alongside 1.231.81.166:3128. 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 South Korea?
Yes, 74 free proxies are exiting from South Korea in our pool right now, answering in 2236ms 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.
1.231.81.166:3128 has answered 99% 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 all211.209.210.50:1080
SOCKS4 · South Korea · 8% · 996ms
221.141.140.132:8118
HTTP · South Korea · 23% · 5523ms
140.238.14.161:8080
HTTP · South Korea · 100% · 611ms
146.56.110.131:8118
HTTP · South Korea · 15% · 867ms
220.116.142.217:80
HTTP · South Korea · 63% · 889ms
112.216.54.226:12121
HTTP · South Korea · 39% · 1135ms
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.