Is 51.146.240.4:3128 a proxy? Yes.
51.146.240.4:3128 is a public HTTPS proxy in the HProxy free proxy list, exiting from United Kingdom. It holds a strong 92% uptime with a high 1943ms response time, and was last checked 1 min ago.
uptime
United KingdomOther ports on this IP
51.146.240.4 is answering on 2 ports right now.
Ports like this one rarely travel alone. We hold 2 of them on 51.146.240.4 and have run 14 checks against them since August 26, 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 51.146.240.4:3128 at 92.3% across 13 checks
How this one compares
Reliable enough to sit in the top quarter of everything we are watching.
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 5,328 proxies answering right now, the middle of the pack answers 15.6% of the checks we send it.
92%
of 13 checks answered
Pool median 15.6%. 51.146.240.4:3128 is in the top quarter.
1943ms
on its last response
Pool median 3,017ms, so this one is roughly 2x quicker than typical.
0
days tracked, still in the live pool
Of the 194,951 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 194,951 endpoints that stopped working.
Middle halfMedianFull range
How quickly one answers
Response time on the last successful check, across the 5,328 proxies answering right now.
Where this address sits
Right now our free pool holds no other free proxies on CATERING UK LIMITED, and 686 in United Kingdom. 51.146.240.4:3128 sits inside that set, so if it is not usable the pages below are where its closest alternatives are. At 1943ms it is slower than the 1428ms median for United Kingdom proxies.
How many free proxies are on CATERING UK LIMITED
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 2 addresses on AS215152, 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 now50%
- Never answered50%
- 1LimitedNetwork-ASAS213790227,266
- 2Amazon.com, Inc.AS1650931,652
- 3Cloudflare, Inc.AS1333522,201
- 4SECURED SERVERS LLCAS2045419,475
- 5Cloudflare, Inc.AS20924214,143
- 6Alibaba (US) Technology Co., Ltd.AS4510211,738
- 7GloboTech CommunicationsAS3666611,542
- 8ChinanetAS41348,454
- AS215152 sits outside the 250 largest networks we hold.
How to use this proxy
Route a request through 51.146.240.4:3128 over HTTPS. Free proxies are shared and rotate out fast, so test before you rely on it.
curl -x https://51.146.240.4:3128 \
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 51.146.240.4:3128
51.146.240.4:3128 is in the live pool right now, and it stays there only for as long as it keeps answering.
Port 3128: Squid default
Port 3128 is the default for Squid, the most widely installed proxy software in the world. Most addresses published on 3128 are Squid servers that were meant to serve one office or one network and ended up reachable by everybody.
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 51.146.240.4:3128 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 HTTPS.
13 checks, 12 answered
That is 92% of the time, measured since August 26, 2026. Every one of those results, successes and failures alike, is a connection HProxy opened itself.
It is being re-tested continuously
51.146.240.4:3128 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 51.146.240.4:3128, and nothing it does not.
- First seen
- August 26, 2026
- Last checked
- August 26, 2026
- Next check due
- continuously
- Checks run
- 13
- Times it answered
- 12
- Spoke
- HTTPS
92%
answered 12 of 13 checks
Questions about 51.146.240.4:3128
Is 51.146.240.4:3128 a working proxy right now?
Yes. 51.146.240.4:3128 answered HProxy's automated check 1 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 51.146.240.4?
It speaks HTTPS, and our checks grade it elite. The port is 3128. Point your client at 51.146.240.4:3128 over https to route a request through it.
Where is 51.146.240.4 located?
Traffic through it exits from Lytham St Annes, United Kingdom, on CATERING UK LIMITED (AS215152). That is where the destination site will think your request came from.
How fast is 51.146.240.4:3128?
It answered in 1943ms 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 51.146.240.4:3128 been?
Across 1 day of tracking it answered 92% 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 51.146.240.4:3128?
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 CATERING UK LIMITED?
None other than 51.146.240.4:3128 at the moment. AS215152 (CATERING UK LIMITED) 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 Kingdom?
Yes, 686 free proxies are exiting from United Kingdom in our pool right now, answering in 1428ms 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
This one is good, and it will still disappear.
51.146.240.4:3128 has answered 92% of our checks, which puts it well above most of what we track. It is still a public endpoint with nobody standing behind it: nobody agreed to serve you, no capacity is set aside for you, and there is no warning on the day it stops. Fine for a test, a bad foundation for anything that has to work tomorrow.
Other live free proxies
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HTTPS · United Kingdom · 12% · 67ms
13.41.196.179:42293
HTTPS · United Kingdom · 13% · 70ms
134.209.18.113:3129
HTTP · United Kingdom · 88% · 180ms
81.168.119.85:443
HTTP · United Kingdom · 89% · 185ms
82.102.11.164:3460
HTTP · United Kingdom · 49% · 210ms
81.19.210.10:80
HTTP · United Kingdom · 41% · 499ms
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.