Is 172.99.187.33:4145 a proxy? Yes.
172.99.187.33:4145 is a public SOCKS4 proxy in the HProxy free proxy list, exiting from Puerto Rico. It holds a spotty 18% uptime with a high 3855ms response time, and last answered our checker 12 min ago.
uptime
Puerto RicoHow this one compares
4,651 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 6,109 proxies answering right now, the middle of the pack answers 41% of the checks we send it.
18%
of 4,651 checks answered
Pool median 41%. 172.99.187.33:4145 sits below it, which is ordinary for a public proxy.
3855ms
on its last response
Pool median 5,163ms.
139
days tracked, still in the live pool
Of the 428,279 free proxies we have watched stop working, half were gone within 20 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 428,279 endpoints that stopped working.
Middle halfMedianFull range
How quickly one answers
Response time on the last successful check, across the 6,109 proxies answering right now.
Where this address sits
Right now our free pool holds no other free proxies on Natural G.C. Inc., and 18 in Puerto Rico. 172.99.187.33:4145 sits inside that set, so if it is not usable the pages below are where its closest alternatives are. At 3855ms it answers faster than the 4789ms median for Puerto Rico proxies (about 80% of it).
How many free proxies are on Natural G.C. Inc.
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 1 address on AS396899, 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 now100%
- 1LimitedNetwork-ASAS213790227,474
- 2SECURED SERVERS LLCAS19437120,032
- 3M247AS900996,419
- 4SECURED SERVERS LLCAS2045456,868
- 5Amazon.com, Inc.AS1650955,636
- 6Cloudflare, Inc.AS1333522,941
- 7Cloudflare, Inc.AS20924214,285
- 8Alibaba (US) Technology Co., Ltd.AS4510212,458
- AS396899 sits outside the 250 largest networks we hold.
How to use this proxy
Route a request through 172.99.187.33:4145 over SOCKS4. Free proxies are shared and rotate out fast, so test before you rely on it.
curl -x socks4://172.99.187.33:4145 \
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 172.99.187.33:4145
172.99.187.33:4145 is in the live pool right now, and it stays there only for as long as it keeps answering.
Port 4145: SOCKS4, common
Port 4145 is everywhere in free proxy lists, nearly always as SOCKS4. No standards body ever gave it that job. It stuck because everyone copied everyone else, so treat the number as a strong hint rather than a promise.
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 172.99.187.33:4145 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 SOCKS4.
4,651 checks, 848 answered
That is 18% of the time, measured since June 14, 2026. Every one of those results, successes and failures alike, is a connection HProxy opened itself.
It is being re-tested continuously
172.99.187.33:4145 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 172.99.187.33:4145, and nothing it does not.
- First seen
- June 14, 2026
- Last checked
- October 31, 2026
- Next check due
- continuously
- Checks run
- 4,651
- Times it answered
- 848
- Spoke
- SOCKS4
18%
answered 848 of 4,651 checks
Questions about 172.99.187.33:4145
Is 172.99.187.33:4145 a working proxy right now?
Yes. 172.99.187.33:4145 answered HProxy's automated check 12 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 172.99.187.33?
It speaks SOCKS4, and our checks grade it elite. The port is 4145. Point your client at 172.99.187.33:4145 over socks4 to route a request through it.
Where is 172.99.187.33 located?
Traffic through it exits from San Juan, Puerto Rico, on Natural G.C. Inc. (AS396899). That is where the destination site will think your request came from.
How fast is 172.99.187.33:4145?
It answered in 3855ms 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 172.99.187.33:4145 been?
Across 90 days of tracking it answered 18% 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 172.99.187.33:4145?
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 Natural G.C. Inc.?
None other than 172.99.187.33:4145 at the moment. AS396899 (Natural G.C. Inc.) has no other free proxies live in our pool right now, though that changes as we re-verify.
Are there other free proxies in Puerto Rico?
Yes, 18 free proxies are exiting from Puerto Rico in our pool right now, answering in 4789ms 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.
172.99.187.33:4145 answers 18% 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 allAbout 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.