Is 72.217.5.73:3129 a proxy? Yes, it was.
72.217.5.73:3129 was a public proxy in the HProxy free proxy pool, exiting from United States on Cox Communications Inc.. Across 890 checks it answered 6% of the time, and it has since gone dark (last answered June 27, 2026), so it is not a usable proxy right now.
across all 890 checks
United StatesUptime & downtime
14
Days tracked
318
Checks run
14.2%
Downtime
8
Down days
How this one compares
It worked sometimes, for 13 days, and then it stopped.
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 3,846 proxies answering right now, the middle of the pack answers 15.2% of the checks we send it.
6%
of 890 checks answered
Pool median 15.2%. 72.217.5.73:3129 sits below it, which is ordinary for a public proxy.
890
real connection attempts
Each one opens a socket and waits up to 90 seconds. Slow and dead look identical if you stop listening early.
13
days from first sighting to last answer
Of the 192,619 free proxies we have watched stop working, half were gone within 28 days of us first seeing them.
June 14, 2026
First listed by our sources
Published as a working proxy by 39 of the public lists HProxy tracks. Being listed is a claim, not a test.
June 27, 2026
Stopped answering
It answered our checks for 13 days before it went quiet.
June 30, 2026
Moved to the permanent record
It left the live pool here. Nothing is deleted: the address keeps this page and stays in the re-check rotation.
August 11, 2026
Most recent re-test
HProxy has opened 890 real connections to this endpoint in total. The sweep reaches every address in the database roughly once every 24 hours.
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 192,619 endpoints that stopped working.
Middle halfMedianFull range
How quickly one answers
Response time on the last successful check, across the 3,846 proxies answering right now.
Continuous monitoring
How HProxy checks 72.217.5.73:3129
HProxy has checked 72.217.5.73:3129 890 times and it answered 52 of those. Every one of those was a real connection attempt, never a lookup.
39 public sources published it
72.217.5.73 appears in 39 of the public proxy sources HProxy tracks. Lists copy from each other constantly, so an address showing up in many of them says a lot about how widely it was republished and very little about whether it ever worked.
Port 3129: Squid, second instance
Port 3129 is Squid's second port. When an address is already serving Squid on 3128, this is where the second instance normally sits.
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 72.217.5.73:3129 and gives it up to 90 seconds to answer. Slow is not the same as dead, 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, so a proxy is never missed because we guessed the wrong protocol.
890 checks, 52 answered
That is 6% of the time, measured since June 14, 2026. Every one of those results, successes and failures alike, is a connection HProxy opened itself.
We are still watching for it to come back
Being archived does not stop the testing. 72.217.5.73:3129 answered before, so it is exactly the kind of address that can return, and the sweep works through the whole database and reaches every address roughly once every 24 hours. Its last check was on August 11, 2026, so the next one is due within a day of that. The moment it answers again it is promoted straight back into the live free proxy list, automatically, with no manual step.
This endpoint
The record
Everything HProxy holds on 72.217.5.73:3129, and nothing it does not.
- First seen
- June 14, 2026
- Last checked
- August 11, 2026
- Next check due
- within 24 hours
- Checks run
- 890
- Times it answered
- 52
- Stopped answering
- June 27, 2026
6%
answered 52 of 890 checks
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Where this address sits
Right now our free pool holds 67 other free proxies on Cox, and 908 in United States. 72.217.5.73:3129 sits inside that set, so if it is not usable the pages below are where its closest alternatives are.
Cox Communications Inc. is the 24th 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 1,875 addresses on AS22773, which is 0.32% of every address in the database and a meaningful pocket of the database. That makes it the 24th largest source of free proxies of every network we have ever seen. 67 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 now4%
- Answered before<1%
- Never answered96%
- 1LimitedNetwork-ASAS213790227,266
- 2Amazon.com, Inc.AS1650926,197
- 3Cloudflare, Inc.AS1333522,185
- 4SECURED SERVERS LLCAS2045419,475
- 5Cloudflare, Inc.AS20924214,136
- 6Alibaba (US) Technology Co., Ltd.AS4510211,650
- 7GloboTech CommunicationsAS3666611,542
- 8ChinanetAS41348,361
15 networks between
24Cox Communications Inc.AS227731,875
Questions about 72.217.5.73:3129
Is 72.217.5.73:3129 a working proxy?
No, not any more. It was a working public proxy in HProxy's free pool and has since gone dark, last answering on June 27, 2026. We still re-test it periodically in case it returns.
Was 72.217.5.73 ever actually a proxy?
Yes. We ran 890 checks against it and it answered 52 of them, about 6% of the time, over 13 days on our list.
What is the hostname for 72.217.5.73?
Its reverse DNS record is ip72-217-5-73.ph.ph.cox.net. That is what the address itself publishes about who operates it, which is often more telling than the network name: hosting providers name their machines by region and instance type, and a residential line usually carries its ISP's own pattern.
Where was 72.217.5.73 hosted?
Gilbert, Arizona, United States, Cox Communications Inc. (AS22773). It is a residential or ISP address rather than a datacenter one.
Why keep a page for an address that no longer works?
Because "was this address ever a proxy, and when" is a real question. If you are looking at this IP in a firewall log or an abuse report, the dates and the check counts here are the answer. HProxy's public proxy IP list keeps every address it has ever tracked and carries on re-testing them, so deleting this record would throw all of that away.
How many free proxies are on Cox?
67 other free proxies are live on Cox (AS22773) in our pool right now, alongside 72.217.5.73:3129. 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 United States?
Yes, 908 free proxies are exiting from United States in our pool right now, answering in 2689ms at the median. If this address is not usable, that list is the place to look for a working one.
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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.