Is 3.99.158.157:17543 a proxy? Yes.
3.99.158.157:17543 is a public HTTP proxy in the HProxy free proxy list, exiting from Canada. It holds a spotty 11% uptime, and was last checked 1 h ago.
CanadaUptime & downtime
7
Days tracked
393
Checks run
88.3%
Downtime
7
Down days
Continuous monitoring
How HProxy checks 3.99.158.157:17543
3.99.158.157:17543 is in the live pool right now, and it stays there only for as long as it keeps answering. Here is exactly what HProxy does to it, and how often.
Port 17543: Registered port range
This port sits in the registered range, which any user-level program may listen on without special rights. It carries no reserved meaning of its own, so the number tells you the proxy was configured deliberately on a chosen port rather than on a system 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 an actual connection to 3.99.158.157:17543 and waits up to 4 seconds for the other end to complete a proxy handshake. 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.
2,275 checks, 255 answered
That is 11% of the time, measured since June 23, 2026. Every one of those results, successes and failures alike, is a connection HProxy opened itself.
It is being re-tested continuously
3.99.158.157:17543 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 3.99.158.157:17543, and nothing it does not.
- First seen
- June 23, 2026
- Last checked
- August 3, 2026
- Next check due
- continuously
- Checks run
- 2,275
- Times it answered
- 255
- Spoke
- HTTP
11%
answered 255 of 2,275 checks
How to use this proxy
Route a request through 3.99.158.157:17543 over HTTP. Free proxies are shared and rotate out fast, so test before you rely on it.
curl -x http://3.99.158.157:17543 \
https://api.ipify.org?format=json
Other live free proxies
View all →
Where this address sits
Right now our free pool holds 5,541 other free proxies on Amazon, and 299 in Canada. 3.99.158.157:17543 sits inside that set, so if it is not usable the pages below are where its closest alternatives are.
What HProxy holds on Amazon.com, Inc.
Open proxies are not spread evenly across the internet. They cluster, because one misconfigured template, one cheap hosting reseller or one leaked image tends to produce hundreds of identical machines on the same network. HProxy tracks 7,017 addresses on AS16509, which is 1.2% of every address in the database and a substantial share of everything HProxy tracks. 16,118 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 now88%
- Answered before12%
Questions about 3.99.158.157:17543
Is 3.99.158.157:17543 a working proxy right now?
Yes. 3.99.158.157:17543 answered HProxy's automated check 1 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 3.99.158.157?
It speaks HTTP. The port is 17543. Point your client at 3.99.158.157:17543 over http to route a request through it.
Where is 3.99.158.157 located?
Traffic through it exits from Montreal, Canada, on Amazon.com, Inc. (AS16509). That is where the destination site will think your request came from.
How reliable has 3.99.158.157:17543 been?
Across 42 days of tracking it answered 11% 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 3.99.158.157:17543?
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?
5,541 other free proxies are live on Amazon (AS16509) in our pool right now, alongside 3.99.158.157:17543. 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 Canada?
Yes, 299 free proxies are exiting from Canada in our pool right now, answering in 454ms 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
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Free IPs are shared and rotate out fast, so success rates swing. The paid network gives you dedicated-clean pools that hold up under load.
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.