Is 51.16.4.39:51277 a proxy? Yes.
51.16.4.39:51277 is a public HTTP proxy in the HProxy free proxy list, exiting from Israel. It holds a spotty 0% uptime, and last answered our checker now.
uptime
IsraelOther ports on this IP
51.16.4.39 is answering on 64 ports right now.
Ports like this one rarely travel alone. We hold 304 of them on 51.16.4.39 and have run 411,138 checks against them since July 23, 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 51.16.4.39:19443 at 18.0% across 3,170 checks
| Port | Uptime | Answered | Status |
|---|---|---|---|
| 19443 | 18.0% | 570 / 3,170 | In the live pool |
| 8227 | 13.9% | 327 / 2,353 | Not responding |
| 23756 | 13.8% | 328 / 2,371 | Not responding |
| 49034 | 13.3% | 370 / 2,784 | Not responding |
| 9958 | 13.1% | 337 / 2,578 | Not responding |
| 5145 | 12.8% | 337 / 2,624 | Not responding |
| 53015 | 12.3% | 339 / 2,746 | In the live pool |
| 1935 | 12.2% | 344 / 2,828 | Not responding |
| 17191 | 12.1% | 382 / 3,158 | Not responding |
| 22510 | 12.0% | 353 / 2,943 | Not responding |
| 2092 | 12.0% | 352 / 2,945 | Not responding |
| 55083 | 11.9% | 353 / 2,969 | Not responding |
How this one compares
2 attempts. Not one connection.
Being published on a proxy list is a claim that an address works. It is not a test, and nobody in that chain is obliged to have tried it. We tried 2 times, which is why the answer on this page is a flat no rather than a maybe.
0%
of 2 checks answered
Pool median 38.4%. 51.16.4.39:51277 sits below it, which is ordinary for a public proxy.
2
real connection attempts
Each one opens a socket and waits up to 90 seconds. Slow and unreachable look identical if you stop listening early.
1
days in our records, never once answering
It is not in the lifespan figures at all: those cover the 441,077 endpoints that worked at least once before they stopped.
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 441,077 endpoints that stopped working.
Middle halfMedianFull range
How quickly one answers
Response time on the last successful check, across the 6,567 proxies answering right now.
Where this address sits
Right now our free pool holds 83 other free proxies on Amazon, and 273 in Israel. 51.16.4.39:51277 sits inside that set, so if it is not usable the pages below are where its closest alternatives are.
Amazon.com, Inc. is the 4th 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 58,942 addresses on AS16509, which is 6.1% of every address in the database and a substantial share of everything HProxy tracks. That makes it the 4th largest source of free proxies of every network we have ever seen. 84 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 before75%
- Never answered25%
- 1LimitedNetwork-ASAS213790227,474
- 2SECURED SERVERS LLCAS19437120,032
- 3M247AS900999,647
- 4Amazon.com, Inc.AS1650958,942
- 5SECURED SERVERS LLCAS2045456,868
- 6Cloudflare, Inc.AS1333522,945
- 7Cloudflare, Inc.AS20924214,287
- 8Alibaba (US) Technology Co., Ltd.AS4510212,501
How to use this proxy
Route a request through 51.16.4.39:51277 over HTTP. Free proxies are shared and rotate out fast, so test before you rely on it.
curl -x http://51.16.4.39:51277 \
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 51.16.4.39:51277
51.16.4.39:51277 is in the live pool right now, and it stays there only for as long as it keeps answering.
Port 51277: 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 failure here was measured, not assumed
Each check opens a real connection to 51.16.4.39:51277 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. Nothing about this record is inherited from the list that published the address. 2 times HProxy tried, and 2 times the connection did not complete inside that budget, which is why the answer on this page is a flat no rather than a maybe. The handshake is attempted across HTTP, HTTPS, SOCKS4 and SOCKS5, which is how we know it spoke HTTP.
2 checks, zero connections
Not one of those 2 attempts reached a working proxy. The address stays in the database with that result attached, because "we tried 2 times and it never answered" is a far more useful answer than silence for anyone who found 51.16.4.39 somewhere and wants to know what it is.
It is being re-tested continuously
51.16.4.39:51277 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 51.16.4.39:51277, and nothing it does not.
- First seen
- November 11, 2026
- Last checked
- November 12, 2026
- Next check due
- continuously
- Checks run
- 2
- Times it answered
- 0
- Spoke
- HTTP
0%
never answered across 2 attempts
Questions about 51.16.4.39:51277
Is 51.16.4.39:51277 a working proxy right now?
Yes. 51.16.4.39:51277 answered HProxy's automated check now 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 51.16.4.39?
It speaks HTTP. The port is 51277. Point your client at 51.16.4.39:51277 over http to route a request through it.
Where is 51.16.4.39 located?
Traffic through it exits from Tel Aviv, Israel, on Amazon.com, Inc. (AS16509). That is where the destination site will think your request came from.
How reliable has 51.16.4.39:51277 been?
Across 2 days of tracking it answered 0% 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 51.16.4.39:51277?
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?
83 other free proxies are live on Amazon (AS16509) in our pool right now, alongside 51.16.4.39:51277. 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 Israel?
Yes, 273 free proxies are exiting from Israel in our pool right now, answering in 653ms 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.
51.16.4.39:51277 answers 0% 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
3.21.247.154:13873
HTTPS · United States · 1% · 62ms
3.134.245.77:3118
HTTPS · United States · 2% · 78ms
3.21.129.156:28252
HTTPS · United States · 2% · 79ms
18.188.168.99:57972
HTTPS · United States · 7% · 89ms
18.222.231.188:9249
HTTPS · United States · 5% · 91ms
18.224.94.46:9404
HTTPS · United States · 4% · 92ms
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.