Is 16.18.37.186:21 a proxy? Yes.
16.18.37.186:21 is a public HTTP proxy in the HProxy free proxy list, exiting from Switzerland. It holds a spotty 13% uptime, and was last checked 9 h ago.
uptime
SwitzerlandUptime & downtime
7
Days tracked
358
Checks run
87.4%
Downtime
7
Down days
Other ports on this IP
16.18.37.186 is answering on 128 ports right now.
Ports like this one rarely travel alone. We hold 131 of them on 16.18.37.186 and have run 232,393 checks against them since May 14, 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 16.18.37.186:21411 at 14.0% across 3,363 checks
| Port | Uptime | Answered | Status |
|---|---|---|---|
| 21411 | 14.0% | 470 / 3,363 | In the live pool |
| 3018 | 13.8% | 466 / 3,371 | In the live pool |
| 53313 | 13.5% | 435 / 3,223 | In the live pool |
| 22518 | 13.4% | 443 / 3,311 | In the live pool |
| 28072 | 13.3% | 449 / 3,384 | In the live pool |
| 47207 | 13.0% | 437 / 3,360 | In the live pool |
| 6577 | 13.0% | 433 / 3,331 | In the live pool |
| 45761 | 13.0% | 423 / 3,263 | In the live pool |
| 8070 | 12.9% | 418 / 3,247 | In the live pool |
| 53902 | 12.9% | 432 / 3,358 | In the live pool |
| 3129 | 12.9% | 450 / 3,498 | In the live pool |
| 11273 | 12.8% | 425 / 3,320 | In the live pool |
How this one compares
367 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 9,349 proxies answering right now, the middle of the pack answers 13.8% of the checks we send it.
13%
of 367 checks answered
Pool median 13.8%. 16.18.37.186:21 sits below it, which is ordinary for a public proxy.
367
real connection attempts
Each one opens a socket and waits up to 90 seconds. Slow and unreachable look identical if you stop listening early.
7
days tracked, still in the live pool
Of the 193,359 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 193,359 endpoints that stopped working.
Middle halfMedianFull range
How quickly one answers
Response time on the last successful check, across the 9,349 proxies answering right now.
Where this address sits
Right now our free pool holds 5,468 other free proxies on Amazon, and 168 in Switzerland. 16.18.37.186:21 sits inside that set, so if it is not usable the pages below are where its closest alternatives are.
Amazon.com, Inc. is the 2nd 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 27,096 addresses on AS16509, which is 4.6% of every address in the database and a substantial share of everything HProxy tracks. That makes it the 2nd largest source of free proxies of every network we have ever seen. 5,469 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 now20%
- Answered before59%
- Never answered21%
- 1LimitedNetwork-ASAS213790227,266
- 2Amazon.com, Inc.AS1650927,093
- 3Cloudflare, Inc.AS1333522,185
- 4SECURED SERVERS LLCAS2045419,475
- 5Cloudflare, Inc.AS20924214,140
- 6Alibaba (US) Technology Co., Ltd.AS4510211,678
- 7GloboTech CommunicationsAS3666611,542
- 8ChinanetAS41348,373
How to use this proxy
Route a request through 16.18.37.186:21 over HTTP. Free proxies are shared and rotate out fast, so test before you rely on it.
curl -x http://16.18.37.186:21 \
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 16.18.37.186:21
16.18.37.186:21 is in the live pool right now, and it stays there only for as long as it keeps answering.
Port 21: System port
Ports below 1024 are protected. On most systems you need administrator rights to open one at all. So whatever is answering here was set up by someone with full control of that machine, not by some ordinary program that happened to be running.
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 16.18.37.186:21 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.
367 checks, 47 answered
That is 13% of the time, measured since August 6, 2026. Every one of those results, successes and failures alike, is a connection HProxy opened itself.
It is being re-tested continuously
16.18.37.186:21 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 16.18.37.186:21, and nothing it does not.
- First seen
- August 6, 2026
- Last checked
- August 13, 2026
- Next check due
- continuously
- Checks run
- 367
- Times it answered
- 47
- Spoke
- HTTP
13%
answered 47 of 367 checks
Questions about 16.18.37.186:21
Is 16.18.37.186:21 a working proxy right now?
Yes. 16.18.37.186:21 answered HProxy's automated check 9 h 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 16.18.37.186?
It speaks HTTP. The port is 21. Point your client at 16.18.37.186:21 over http to route a request through it.
Where is 16.18.37.186 located?
Traffic through it exits from Zurich, Switzerland, on Amazon.com, Inc. (AS16509). That is where the destination site will think your request came from.
How reliable has 16.18.37.186:21 been?
Across 8 days of tracking it answered 13% 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 16.18.37.186:21?
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?
5,468 other free proxies are live on Amazon (AS16509) in our pool right now, alongside 16.18.37.186:21. 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 Switzerland?
Yes, 168 free proxies are exiting from Switzerland in our pool right now, answering in 204ms 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.
16.18.37.186:21 answers 13% 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 →
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.