Four proxy routes are arranged as distinct network cards with a shared evidence key
Original illustration for Relay Signal Review. Guide and sources checked October 23, 2026.

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Proxy labels describe different dimensions. Datacenter, residential and mobile usually describe network ownership or the type of exit. HTTP, HTTPS and SOCKS5 describe transport behavior. VPN and Tor describe other tunneling or routing systems. A useful vendor comparison states which dimension each field represents.

  1. 1Name ownership
  2. 2Name transport
  3. 3Name observed use
A practical sequence for the question covered in this guide.

Datacenter proxies

Datacenter exits use hosting or cloud networks. Ownership is comparatively easy to identify from ASN and infrastructure data, but hosting is not identical to proxying. Monitoring, server integrations and ordinary cloud workloads also originate from datacenters. The detector should separate hosting context from observed relay use where possible.

Residential and ISP proxies

Residential exits use addresses assigned to consumer ISPs. Some commercial products also use the term ISP proxy for static addresses that appear residential but run in hosted environments. Registry ownership alone cannot prove whether a household address is relaying traffic, so observed use, recency and live visit evidence are especially important.

Mobile proxies

Mobile exits use carrier networks and may sit behind carrier-grade NAT. Many unrelated subscribers can share visible infrastructure, and addresses can change naturally. A mobile or carrier label should not be converted into automatic risk. Test whether the product distinguishes normal carrier traffic from observed proxy service use.

SOCKS5 and HTTP proxies

SOCKS5 operates below HTTP and does not need to inject headers such as X-Forwarded-For or Via. A detector that relies on those headers will miss clean SOCKS5 tunneling. HTTP header anomalies can still be useful when present, but they are one signal rather than a complete method.

VPN, Tor and privacy relays

VPNs and Tor have different network structures and privacy goals. Apple Private Relay separates IP and browsing information and is designed as a privacy service. Correctly identifying a relay is different from proving account abuse. Keep the connection type visible and combine it with the actual application event.

Comparison checklist

  • Does the product distinguish hosting from observed proxy use?
  • Are residential and mobile fields available in the selected plan?
  • Are SOCKS5 connections covered without relying on HTTP headers?
  • Is provider attribution separate from risk?
  • Are observation time, confidence and unknown states exposed?
  • Can the result be associated with device and account activity?

Proxy types compared by ownership, protocol and evidence

Comparison of the methods and conditions discussed in this section.
Term What it describes Detection evidence to inspect
Datacenter proxy An exit hosted on infrastructure networks Hosting ownership plus evidence of proxy use
Residential proxy Traffic relayed through consumer connections Observed proxy use, provider association or live session evidence
Mobile proxy An exit on a carrier network Carrier context plus observed relay activity; carrier NAT alone is insufficient
ISP or static residential proxy A commercial exit associated with ISP addressing Address ownership and observed use, checked separately
HTTP proxy Application transport for HTTP requests or tunnels Provider observations and connection/session evidence
SOCKS5 proxy A transport protocol for relaying application traffic Methods that do not depend on HTTP headers
Tor exit The outbound endpoint of a Tor circuit Maintained exit observations and specific Tor fields
Privacy relay A privacy service that intermediates requests A dedicated relay label and legitimate-use handling

The SOCKS5 definition comes from RFC 1928. It specifies a protocol, not a residential or datacenter ownership category. A SOCKS5 endpoint can use either kind of address. A vendor saying it detects residential proxies has not thereby described how it handles SOCKS5, IPv6 or mobile exits.

Why mobile does not mean proxy

RFC 6598 reserves shared address space for service-provider NAT deployments. Carrier NAT lets multiple subscribers share public egress, which makes address reuse a poor substitute for user identity. Marking all carrier traffic as mobile proxy traffic would mix ordinary connectivity with observed relay use.

The same distinction applies to hosting. A cloud-hosted monitoring service can be legitimate and still have a hosting ASN. Decide whether the product promises ownership classification, proxy observation or abuse detection, then evaluate the corresponding claim. The methodology keeps taxonomy, corroboration and false-positive discipline as separate categories for this reason.

What to ask a vendor about coverage

Ask for the exact output fields for residential, mobile, VPN, Tor, relay, hosting and unknown cases. Ask whether the fields describe a historical address association or the current connection. Finally, request examples from the plan being considered: a website's manual checker and its paid API may expose different evidence. Use the checkers directory to find an evaluation route, then follow the evaluation guide.

FAQ

Is an ISP proxy the same as a residential proxy?

Terminology varies. Ask the vendor how it defines each field, whether it reflects ownership or observed use, and which networks are included. Do not compare names without comparing definitions.

Can a SOCKS5 proxy be detected from HTTP headers?

Not reliably. SOCKS5 does not need to add HTTP forwarding headers. Detection needs IP intelligence, connection evidence, live session signals or a combination.

Is Private Relay a proxy?

It is a privacy relay that changes what sites can see about the user’s network. Products may classify it separately. Its presence alone should not be treated as proof of fraud.

Sources

Sources reviewed October 23, 2026.

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