Is 66.59.197.63:4000 a proxy? Yes.
66.59.197.63:4000 is a public HTTP proxy in the HProxy free proxy list, exiting from United States. It holds a spotty 9% uptime, and was last checked 3 h ago.
uptime
United StatesUptime & downtime
6
Days tracked
256
Checks run
91%
Downtime
6
Down days
Other ports on this IP
66.59.197.63 is answering on 1 ports right now.
Ports like this one rarely travel alone. We hold 3 of them on 66.59.197.63 and have run 272 checks against them since August 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 66.59.197.63:4000 at 9.0% across 256 checks
How this one compares
256 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 4,737 proxies answering right now, the middle of the pack answers 14.9% of the checks we send it.
9%
of 256 checks answered
Pool median 14.9%. 66.59.197.63:4000 sits below it, which is ordinary for a public proxy.
256
real connection attempts
Each one opens a socket and waits up to 90 seconds. Slow and unreachable look identical if you stop listening early.
5
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 no other free proxies on Flexential Colorado, and 912 in United States. 66.59.197.63:4000 sits inside that set, so if it is not usable the pages below are where its closest alternatives are.
How many free proxies are on Flexential Colorado Corp.
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 14 addresses on AS13649, which is 0.00% of every address in the database and a small corner of the database. 1 of them is answering right now, so if this particular address is not usable, the network is a reasonable place to look for one that is.
- Answering now7%
- Answered before21%
- Never answered71%
- 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
- AS13649 sits outside the 250 largest networks we hold.
How to use this proxy
Route a request through 66.59.197.63:4000 over HTTP. Free proxies are shared and rotate out fast, so test before you rely on it.
curl -x http://66.59.197.63:4000 \
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 66.59.197.63:4000
66.59.197.63:4000 is in the live pool right now, and it stays there only for as long as it keeps answering.
Port 4000: 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 66.59.197.63:4000 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.
256 checks, 23 answered
That is 9% of the time, measured since August 13, 2026. Every one of those results, successes and failures alike, is a connection HProxy opened itself.
It is being re-tested continuously
66.59.197.63:4000 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 66.59.197.63:4000, and nothing it does not.
- First seen
- August 13, 2026
- Last checked
- August 18, 2026
- Next check due
- continuously
- Checks run
- 256
- Times it answered
- 23
- Spoke
- HTTP
9%
answered 23 of 256 checks
Questions about 66.59.197.63:4000
Is 66.59.197.63:4000 a working proxy right now?
Yes. 66.59.197.63:4000 answered HProxy's automated check 3 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 66.59.197.63?
It speaks HTTP. The port is 4000. Point your client at 66.59.197.63:4000 over http to route a request through it.
Where is 66.59.197.63 located?
Traffic through it exits from United States, on Flexential Colorado Corp. (AS13649). That is where the destination site will think your request came from.
How reliable has 66.59.197.63:4000 been?
Across 6 days of tracking it answered 9% 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 66.59.197.63:4000?
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 Flexential Colorado?
None other than 66.59.197.63:4000 at the moment. AS13649 (Flexential Colorado) has no other free proxies live in our pool right now, though that changes as we re-verify.
Are there other free proxies in United States?
Yes, 912 free proxies are exiting from United States in our pool right now, answering in 1692ms 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.
66.59.197.63:4000 answers 9% 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 →66.59.197.61:4000
SOCKS5 · United States · 6% · 2868ms
34.207.239.230:43491
SOCKS4 · United States · 14% · 304ms
3.19.213.118:8890
HTTPS · United States · 12% · 325ms
18.190.253.157:30967
HTTPS · United States · 12% · 328ms
18.222.132.180:2297
HTTPS · United States · 12% · 333ms
34.207.102.197:33131
HTTPS · United States · 17% · 342ms
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.