Is 3.21.129.156:53534 a proxy? Yes.
3.21.129.156:53534 is a public HTTPS proxy in the HProxy free proxy list, exiting from United States. It holds a spotty 6% uptime with a quick 122ms response time, and last answered our checker 1 hr ago.
uptime
Other ports on this IP
3.21.129.156 is answering on 10 ports right now.
Ports like this one rarely travel alone. We hold 20 of them on 3.21.129.156 and have run 2,837 checks against them since October 3, 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 3.21.129.156:33353 at 12.3% across 383 checks
| Port | Uptime | Answered | Status |
|---|---|---|---|
| 33353 | 12.3% | 47 / 383 | In the live pool |
| 8000 | 10.8% | 57 / 528 | In the live pool |
| 1081 | 9.4% | 32 / 340 | Not responding |
| 44480 | 4.4% | 11 / 249 | Not responding |
| 2085 | 3.4% | 8 / 236 | In the live pool |
| 8111 | 3.1% | 6 / 196 | Not responding |
| 51847 | 3.0% | 6 / 201 | In the live pool |
| 8118 | 2.8% | 7 / 251 | In the live pool |
| 7540 | 1.7% | 3 / 177 | Not responding |
| 33776 | 1.1% | 2 / 181 | Not responding |
| 6847 | 37.5% | 3 / 8 | In the live pool |
| 245 | 18.8% | 3 / 16 | In the live pool |
How this one compares
17 checks in, its uptime is ordinary for a free proxy.
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 7,930 proxies answering right now, the middle of the pack answers 31.2% of the checks we send it.
6%
of 17 checks answered
Pool median 31.2%. 3.21.129.156:53534 sits below it, which is ordinary for a public proxy.
122ms
on its last response
Pool median 5,356ms, so this one is roughly 44x quicker than typical.
7
days tracked, still in the live pool
Of the 395,561 free proxies we have watched stop working, half were gone within 22 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 395,561 endpoints that stopped working.
Middle halfMedianFull range
How quickly one answers
Response time on the last successful check, across the 7,930 proxies answering right now.
Where this address sits
Right now our free pool holds 88 other free proxies on Amazon, and 20,906 in United States. 3.21.129.156:53534 sits inside that set, so if it is not usable the pages below are where its closest alternatives are. At 122ms it answers faster than the 3229ms median for United States proxies (about 4% of it).
Amazon.com, Inc. is the 5th 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 49,848 addresses on AS16509, which is 5.5% of every address in the database and a substantial share of everything HProxy tracks. That makes it the 5th largest source of free proxies of every network we have ever seen. 89 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 now<1%
- Answered before80%
- Never answered20%
- 1LimitedNetwork-ASAS213790227,474
- 2SECURED SERVERS LLCAS19437120,032
- 3M247AS900977,352
- 4SECURED SERVERS LLCAS2045456,868
- 5Amazon.com, Inc.AS1650949,848
- 6Cloudflare, Inc.AS1333522,932
- 7Cloudflare, Inc.AS20924214,281
- 8Alibaba (US) Technology Co., Ltd.AS4510212,386
How to use this proxy
Route a request through 3.21.129.156:53534 over HTTPS. Free proxies are shared and rotate out fast, so test before you rely on it.
curl -x https://3.21.129.156:53534 \
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 3.21.129.156:53534
3.21.129.156:53534 is in the live pool right now, and it stays there only for as long as it keeps answering.
Port 53534: Ephemeral port range
This is a throwaway port number, the kind a computer hands out for a few minutes and then takes back. Anything published on one tends to move or disappear when its host restarts, which is a large part of why public proxy lists rot so fast.
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 3.21.129.156:53534 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 HTTPS.
17 checks, 1 answered
That is 6% of the time, measured since October 6, 2026. Every one of those results, successes and failures alike, is a connection HProxy opened itself.
It is being re-tested continuously
3.21.129.156:53534 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 3.21.129.156:53534, and nothing it does not.
- First seen
- October 6, 2026
- Last checked
- October 13, 2026
- Next check due
- continuously
- Checks run
- 17
- Times it answered
- 1
- Spoke
- HTTPS
6%
answered 1 of 17 checks
Questions about 3.21.129.156:53534
Is 3.21.129.156:53534 a working proxy right now?
Yes. 3.21.129.156:53534 answered HProxy's automated check 1 hr 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 3.21.129.156?
It speaks HTTPS, and our checks grade it elite. The port is 53534. Point your client at 3.21.129.156:53534 over https to route a request through it.
Where is 3.21.129.156 located?
Traffic through it exits from Columbus, United States, on Amazon.com, Inc. (AS16509). That is where the destination site will think your request came from.
How fast is 3.21.129.156:53534?
It answered in 122ms 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 3.21.129.156:53534 been?
Across 8 days of tracking it answered 6% 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 3.21.129.156:53534?
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 Amazon?
88 other free proxies are live on Amazon (AS16509) in our pool right now, alongside 3.21.129.156:53534. 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 United States?
Yes, 20,906 free proxies are exiting from United States in our pool right now, answering in 3229ms 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
Free proxies fail. This is what that looks like.
3.21.129.156:53534 answers 6% of the time, and that is ordinary for a public proxy. Nothing here is a service anybody sells you, which is why the numbers swing and why the list turns over constantly.
Other live free proxies
View all
18.190.253.157:27719
HTTPS · United States · 10% · 95ms
18.188.168.99:59853
HTTPS · United States · 13% · 139ms
3.134.245.77:12438
HTTPS · United States · 23% · 147ms
35.183.78.223:56105
HTTPS · Canada · 17% · 189ms
18.191.250.90:4194
HTTPS · United States · 3% · 190ms
35.183.127.162:20948
HTTPS · Canada · 4% · 190ms
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.