A clean IP is an address with nothing against it in the records a website checks. It is on no blocklist and has no recent abuse reports. It carries no proxy, VPN or Tor flag, and it belongs to a network that looks like a home or a business. Clean has no formal definition: it describes the address's record on the day you check. We ran four of these checks on the free proxies working on our list on October 22, 2026. Only 6 of 5,948 passed all four.
What is a clean IP?
"Clean IP" is a sellers' word, so it helps to pin it down. An address is clean when every record a site can read about it is empty or good. Some sellers also sell "virgin" addresses, meaning no customer has used them before, at a higher price.
Clean IP
a reputation label
An IP address with nothing against it in the records a website checks: no blocklist entry, no recent abuse reports, no proxy, VPN or Tor flag, and a network that looks like a home or a business.
Clean is a record, and records change. An address that passes today can fail next week.
What is a clean IP clean of?
Four records decide it, and each comes from a different source.
Blocklists. A DNS blocklist, or DNSBL, is a list of addresses published through DNS. Spamhaus defines it as "a list of IP address ranges or other information compiled and presented as a DNS zone". Spamhaus runs several, and its ZEN list combines the SBL, XBL, CSS and PBL zones. A mail server or a website checks an address with one DNS lookup. RFC 5782 describes the method: reverse the address's numbers, add the list's domain, and a reply such as 127.0.0.2 means the address is listed. Spamhaus answers its IP lists from the 127.0.0.0/24 range, so the exact reply also tells you which list matched.
Abuse reports. Some services collect reports from site operators. AbuseIPDB publishes a confidence score for each address. It calls the score "our calculated evaluation on how abusive the IP is based on the users that reported it".
Proxy, VPN and Tor flags. Reputation services keep lists of known exits. IPQualityScore calls scores of 75 and up "likely to be a proxy, VPN, or TOR connection". Our page on IP fraud scores compares how five services read those numbers.
The network. Every address belongs to a network with an ASN, and hosting networks are easy to spot. Six cloud companies alone publish 185,168,739 IPv4 addresses in their own range files, as we counted on October 22, 2026. Our page on datacenter vs residential proxies explains why that matters.
What do clean and virgin IPs cost?
Some sellers price the record into the address. Evomi sells its static residential IPs in three grades, which it says differ "by how many other customers have used the address":
IPBurger priced a Fresh Dedicated IP at $9.58 a month in our record of August 3, 2026, against $4.58 for a Private Dedicated IP. Paying more buys an empty record on the day you start, and the address's record from then on is yours to keep.
How many free proxies are clean?
Almost none. We run an IP reputation check on every working address of our free proxy list. At 07:40 UTC on October 22, 2026, 5,948 free proxies were working, and every one had a result. We applied four clean checks one after the other:
51% lost from Working free proxies
99% lost from Not on a hosting network
15% lost from No proxy, VPN or Tor flag
74% lost from No recent abuse
Taken one at a time, the checks failed most of them anyway. 51% sat on hosting networks, 99.3% carried a proxy, VPN or Tor flag, and 82% showed recent abuse. A free proxy is shared by everyone who finds it, and its record shows it. Our pages on whether free proxies are safe and on anonymous proxy detected errors cover the same list.
Why does a dirty IP fail before you do anything?
Every record above can be read from the address alone, before your request says anything. A site that checks reputation can refuse you on the first connection, however ordinary the request is. Cloudflare counts IP reputation and IP rate limiting among the "traditional defenses", and it wrote in 2024 that rotation lets attackers bypass them. Sites now add other signals, which our guide to how websites detect proxies covers. The address checks still come first and cost the site the least.
A blocked address is also a wasted request. Our guide on avoiding IP bans covers what to do when an address is refused.
Why do home IP addresses get listed?
A home address can be dirty without its owner doing anything. Spamhaus explains one reason in its own FAQ on residential proxies. Spamhaus lists a home address when its mail traffic shows "this IP or a device behind it is part of a Residential PROXY Network". It adds that the device "is usually a device like a smartphone, streaming stick (e.g., Fire TV) or a device on your guest network".
Sharing is the second reason. Spamhaus tells the owner of a listed address behind CGNAT that the traffic "is likely coming from another customer sharing the same address pool". Our page on carrier-grade NAT explains how carriers share one address among many subscribers.
Why do clean IP checks disagree?
Each service keeps its own records and draws its own lines. Scamalytics suggests extra checks from a score of 20 and calls 0 to 19 low risk. IPQualityScore starts calling a score suspicious at 75. A blocklist that collects spam sources says nothing about scraping, and a report service only knows what its users filed. The same address can therefore pass one check and fail another on the same day.
Read every result against its own scale, and weight the records your target is likely to use. A mail server cares about spam lists. A shop's checkout cares about fraud scores and proxy flags.
How do you check if an IP is clean?
Check each record, using the address you will actually use:
- The network. Our IP lookup shows an address's network and ASN, and whether it is a known proxy.
- The fraud score. Our free proxy checker app shows the fraud score of the exit you connect through.
- Blocklists. Spamhaus offers a Reputation Checker and a Blocklist Tester on its own site.
- Abuse reports. AbuseIPDB shows the reports filed against an address.
- Your target. No list knows every site's private rules, so send a few real requests and read what comes back.
With a rotating line, each new connection can bring a new address, so check a sample of exits.
Can a datacenter IP be clean?
On the blocklists, yes. A dedicated datacenter address that nobody has abused can be on no list and carry no reports. It still fails the network check on any site that screens hosting addresses, because its network is public. On our free list, more than half of the datacenter addresses scored 75 or more on the fraud check. That was in the 06:57 UTC read. Whether that matters depends on the site, which our page on datacenter vs residential proxies covers.
Is a residential IP always clean?
No address is clean by type alone. A residential address starts on a consumer network. In our 06:57 UTC read that day, free proxies on consumer networks scored better. Their median fraud score was 55, against 80 on datacenter networks. The address's own history decides the rest, and the reasons above show how a home address picks one up.
We make no promise about the record of any exit, ours included, so check the one you get. Our residential proxies cost $0.50 per GB for one GB and $0.44/GB at 2,000 GB+, and residential pricing lists every tier. Our page on what a residential proxy is covers how they work.
Does a clean IP get you past bot protection?
It clears the address checks and nothing else. Sites also read your TLS fingerprint, your headers and your behavior. Cloudflare wrote in 2024 that its model caught 95% of the requests in one distributed residential proxy attack. A clean address paired with a scripting library's fingerprint and machine-perfect timing still stands out.
How long does an IP stay clean?
Until someone dirties it. Reputation follows recent behavior: IPQualityScore says its scores of 90 and up "indicate recent or excessive abuse". An address that passes today can fail next week, so check again before you depend on it.
What this page could not check
- One reputation check. The free proxy results come from one IP reputation check on our list, read at 07:40 UTC. The working list changes every few minutes.
- No blocklist queries. We did not query Spamhaus or AbuseIPDB for the free proxies, so the four checks use our check's flags and score.
- No paid networks. We did not check any paid proxy network, ours included.
- Private rules. No public record shows a site's own blocklists.
- Check by January 22, 2027. Lists, scores and services change.
Sources
- RFC 5782: DNS Blacklists and Whitelists. IETF, February 2010.
- Spamhaus: FAQ on DNSBL usage and FAQ on residential proxies, read October 22, 2026.
- AbuseIPDB: API documentation, read October 22, 2026.
- IPQualityScore: Proxy and VPN Detection API, response parameters, read October 22, 2026.
- Using machine learning to detect bot attacks that use residential proxies. Cloudflare blog, June 24, 2024.
- Published IP range files of AWS, Microsoft Azure, Google Cloud, Oracle Cloud, DigitalOcean and Linode, downloaded October 22, 2026.
- HProxy free proxy list: IP reputation check of the working free proxies, October 22, 2026.
