Ethical Residential Proxies: What Massive Blocks by Default, and How Exceptions Work

An ethical residential proxy network doesn't only get consent from the people whose devices carry the traffic. It also publishes what that traffic can't be used for. Massive blocks nine categories of destination on its residential network by default, for every customer, from the day the account opens. Malware and phishing hosts are on the list, and so are banks, crypto exchanges, gambling sites, and streaming platforms. Some customers have a legitimate reason to reach a blocked category, such as fraud investigation or brand protection, and for them there is a reviewed exception process. Some things have no exception at all. This report sets out the published policy, what a blocked request looks like, and how to ask for access.

Key Takeaways

• Massive's residential network blocks nine destination categories at the network layer by default, using lists from third-party, industry-standard blocklist providers (Massive, policy last updated July 16, 2026).
• Exceptions are granted per customer and per category, after due diligence, and are re-reviewed every time the lists refresh.
• Child sexual abuse material, prohibited activity, and sanctioned jurisdictions are never subject to exception.
• A request blocked by content policy fails with 452 Disallowed Content; a blocked port fails with 453 Port Forbidden (Massive Docs).

What makes a residential proxy network ethical?

An ethical residential proxy network gets informed, opt-in consent from the people whose devices carry the traffic, and it vets the customers who send that traffic. On the consent side, every device on Massive's network opted in through the Massive SDK, and our opt-in network report explains how that works.

Consent is only half of it. Massive's public reference, Best Practices for Consent-Based Residential Network Services (adopted for public release July 16, 2026), puts it this way: the model "rests on informed consumer consent on one side and rigorous customer vetting on the other." It recommends baseline standards for any operator in four areas:

1. Consumer consent and disclosure
2. Consumer data protection
3. Device-level technical safeguards
4. Customer vetting and abuse prevention

Under the fourth, it recommends "published prohibited uses" and use-case review "against a published acceptable use policy." Publishing what the network blocks is how a buyer, a site owner, or a device owner can check that side for themselves.

Why publish what we block?

Because a network's limits are part of what you buy. If you are evaluating a web access vendor, you should know before you sign which destinations will fail, why, and what you can do about it. If you are a site owner, you should know which kinds of sites a network refuses to route traffic to at all. "We block bad stuff" is not an answer to either question.

This is the fourth entry in our transparency series. The opt-in network report covers where the devices come from, and the Q3 2026 network integrity update covers compliance. The domain blocking report covers the blocklist each customer controls for their own traffic. This one covers the blocks Massive applies to everyone.

Which blocked destination categories apply to every customer?

Per the published Blocked Destination Categories policy, these are blocked at the network layer:

The category lists come from "third-party, industry-standard blocklist providers" and are "refreshed automatically on the provider's release cycle." In practice, a domain can move into or out of a blocked category without any change on Massive's side, because the provider reclassified it.

No per-category rationale is published. The docs state the general aim: the network "is intended to optimize delivery of content that could be reasonably considered 'family friendly'" to a worldwide user base (Massive Docs). The network itself runs on devices whose owners opted in through the Massive SDK, as our opt-in network report explains, so every routed request leaves from one of those people's connections.

What is prohibited no matter where the request goes?

Destinations are one list. Behavior is another. These activities are prohibited under the Acceptable Use Policy regardless of destination:

• Denial-of-service and distributed denial-of-service attacks
• Malware, ransomware, spyware, and adware distribution
• Child sexual abuse material, and activity targeting minors
• Spam and unsolicited bulk email
• Credential stuffing and unauthorized network scanning
• Content-filtering circumvention
• Cracking, warez, and ROM distribution
• Activity violating applicable law or third-party rights

Massive also does not knowingly do business with people or entities subject to comprehensive sanctions administered by OFAC, the EU (EU Sanctions Map), the UK (UK sanctions list), or the UN. Named targets include Cuba, Iran, North Korea, Syria, and the regions of Crimea, Donetsk, Luhansk, Kherson, and Zaporizhzhia.

What else is restricted at the protocol level?

Separate from destination categories, the residential network has technical limits (Massive Docs):

• UDP traffic isn't allowed.
• Only standard ports 80 and 443 are open. https://example.com/ works; http://example.com:8080 does not.
• Port 25 can't be opened. For email testing, customers can request access to port 587 or 465.

These limits sit on top of the category blocks, so a request can fail for two different reasons. A destination can be allowed by category and still be unreachable because it listens on a non-standard port. Per the error reference, a blocked port returns 453 Port Forbidden, and "support can enable others" (Massive Docs). So if a target serves an API on port 8080 or 8443, expect a 453 rather than a 452, and ask support about port access instead of a category exception.

What does a blocked request look like?

Massive-generated errors use their own status codes, so you can tell a policy block from a problem at the target site. Codes 452 to 454 and 470 to 477 come from inside Massive. Any other code, including a plain 500, 502, or 503, came from the target site and is passed through unchanged. Every Massive-generated error also carries an X-Massive-Reason header with a short, machine-readable cause (Massive Docs).

471 isn't a policy block. It's in the table because it is the other Massive-side failure people most often mistake for one.

SOCKS5 connections have no headers, so a policy block there shows as reply code 0x04, and a forbidden port as 0x0A. If you need the specific reason, use the HTTP(S) endpoint.

When a request fails, check it in this order:

1. 452: a content policy block. Find the category on the policy page, then request an exception if your use case qualifies.
2. 453: a port block. Ask support about port access; a category exception won't help.
3. 471: routing, not policy. Loosen your geo or routing parameters and try again.
4. Any code outside 452 to 454 and 470 to 477: it came from the target site, so debug the target, not Massive.

A 452 is a decision, not an outage. Retrying it won't change the result, and a retry loop on a blocked destination only burns requests. Log it, and route it to whoever owns your vendor relationship.

If your retry logic predates the current error codes

The error reference includes a "Previously" column showing which code each Massive-generated error used to return (Massive Docs). Reading it as a migration table shows how much the old codes hid. Under the old scheme, a 503 could mean five different things on Massive's side, and a 502 could mean three, on top of any 502 or 503 passed through from the target site. A policy block and a closed port both came back as 452.

For proxy errors in general, including the standard codes, see our guide to fixing and troubleshooting common proxy errors. If your client retries every 5xx the same way, it will now see codes it doesn't recognize. Map each one to its own action, and keep any rule that treats a 452 as retryable out of your code.

How do exceptions work?

The categories are "the default posture applied to every customer at onboarding." A customer can get a category-level exception "where a legitimate business need is established and verified through Massive's customer due diligence process" (Massive).

Five use cases are recognized as possibly needing a blocked category: threat intelligence, open-source intelligence, security research, brand protection, and fraud investigation. A brand protection team, for example, may need to reach gambling or adult sites that misuse its trademarks.

Four rules govern every exception:

1. Scoped. Exceptions are granted per customer and per category, scoped to the verified use case, and documented in the customer's agreement.
2. Reviewed on arrival. Requests are reviewed as they come in.
3. Re-reviewed on every refresh. Existing exceptions are checked again each time the category lists update.
4. Revocable. Access is withdrawn if the use case changes or the terms aren't met.

To start, check which category applies to your target on the policy page. The knowledge base lists the steps: submit a request through the Massive Help Desk, complete the KYC (Know Your Customer) process, provide documents verifying your identity and business, and wait for approval (Massive Docs). Policy questions and category exception requests can also go to legal@joinmassive.com.

What is never open to exception?

Three things. On the first, the language is absolute: child sexual abuse material "is never subject to exception or waiver, under any circumstance, for any customer, for any stated purpose. There is no review path and no approval path. Requests are declined and the account is escalated." The prohibited activity list and the sanctioned jurisdictions are also "not subject to exception."

The exception process described above stops at the category list. No use case, contract size, or due diligence result moves child sexual abuse material, the prohibited activity list, or sanctioned jurisdictions into scope. If a request touches one of them, there is nothing to apply for.

What this report doesn't cover

This report describes the published policy and documentation as of October 2026. It doesn't report how many exceptions have been requested or granted, or how many requests were blocked. We don't publish those figures yet. The policy page is titled "Massive Residential Proxy Network: Blocked Destination Categories," and this report keeps to that scope. It doesn't say whether the same list applies to the Web Render API, so ask support before assuming it does. For the controls customers apply to their own traffic, see the domain blocking report.

The bottom line

• For an ethical residential proxy network, published limits matter as much as consent. Nine blocked destination categories apply by default to every customer, from third-party lists that refresh automatically.
• Exceptions exist for verified needs, granted per customer and per category, and re-checked on every list refresh.
• Child sexual abuse material, prohibited activity, and sanctioned jurisdictions are never open to exception. Treat a 452 as a policy decision, not an error to retry.

Sources

• Massive, "Blocked Destination Categories", last updated July 16, 2026
• Massive Docs, "Usage restrictions"
• Massive Docs, "Error Types", including the "Previously" column, checked October 10, 2026
• U.S. Treasury, OFAC Sanctions Programs and Country Information; EU Sanctions Map; UK Government, The UK Sanctions List
• Massive Docs, "How can I request access to restricted content for legitimate business needs?"