How to remove your IP from GBUdb Truncate

Truncate has no delist button. It is a statistical reputation list that clears itself once the bad mail stops. Here is what to fix and how long it takes.

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What it is

The list, in plain terms.

GBUdb Truncate is a DNS blocklist published at the zone truncate.gbudb.net by ARM Research Labs, LLC. GBUdb stands for the "Good, Bad, Ugly database", a real-time, collaborative IP reputation system built into the Message Sniffer anti-spam engine. Truncate is the strictest slice of that data, exposed as an RFC 5782 compliant DNSBL.

It lists IP addresses, not domains. The list is not a database of entries someone curates — it is generated live from the statistics that thousands of Message Sniffer nodes share about the IPs sending mail through them. An IP appears on Truncate only when substantially all recent traffic from it looks like spam, scams, viruses or other malware.

Because the listing criteria are deliberately severe, receivers that use Truncate typically reject connections from a listed IP outright. That makes a listing worth clearing quickly, but there is nothing to submit: maintenance is entirely automatic and there is no provision for manual addition or removal.

Why you get listed

What a listing on GBUdb Truncate means.

Overwhelmingly bad traffic An IP is listed when more than 95% of all recorded events for it, across all active GBUdb nodes, indicate a bad message — spam, scam, virus or other malware — and there are enough events for the statistics to be considered reliable.

A compromised or abused host That pattern usually means the machine on the IP is infected, hosting a spam or malware operation, or relaying for one. Truncate does not distinguish intent; it reflects what the traffic looks like to the collaborative network.

A fast-moving outbreak Data is collected in real time and the zone is rebuilt every 10 minutes, so an IP can be added within 10 minutes of an outbreak. A sudden spike of bad mail from a newly compromised host is enough.

How to get removed

Delisting, in order.

Removal is free. Fix the cause first — a listing you clear without a fix comes straight back.

1 Confirm the listing. Look your IP up against truncate.gbudb.net. A DNS answer of 127.0.0.2 confirms the IP is listed; no answer means it is not. Any DNSBL lookup tool works, or query the reversed IP directly, for example 25.113.0.203.truncate.gbudb.net.
2 Find and stop the source of the bad mail. This is the only action that removes the listing. Identify what is sending spam or malware from the IP: a compromised account or CMS, a malware infection, an open relay or proxy, or a hijacked application. Clean or close it so the IP stops emitting messages that trigger the listing criteria.
3 Let the reputation decay. There is no removal request to file. Every 24 hours the good and bad event counts for an IP are halved, so as clean traffic replaces the bad traffic the confidence in the listing falls until the IP drops off on its own. Do not look for a form — none exists, by design.
4 Re-check before you resume sending. Query truncate.gbudb.net again and confirm you no longer get 127.0.0.2. If the bad traffic restarts, the statistics will relist the IP within minutes, so only ramp up once the cause is genuinely resolved.

The official route

Straight to the source.

Removal happens on GBUdb Truncate's own tool — never through a paid service.

GBUdb Truncate removal tool ↗

Return codes

127.0.0.2 Listed — the IP produces almost exclusively spam, scams, viruses or other malware in the global GBUdb network

How long it takes

Removal is automatic and driven by statistical decay, not a request. Once the bad activity stops and no further bad events are recorded, the confidence figure falls until the IP is no longer listed — in most cases within a day or two. If the listing followed a severe outbreak with a large volume of bad messages, it can take a week or more for the IP to be forgotten.

Common questions

About GBUdb Truncate, specifically.

How do I request removal from GBUdb Truncate? You cannot. ARM Research Labs states there is no provision for manual removal or delisting requests. The list is generated automatically from live statistics, so the only way off is to stop the traffic that got you listed and let the reputation age out.

Does GBUdb charge to delist my IP? No. There is no delisting process to pay for, and removal is entirely automatic. Any service that offers to remove you from Truncate for a fee is a scam — no third party can influence the statistics or speed up the decay.

How long does it take to get off truncate.gbudb.net? Usually a day or two after the bad activity stops. The event counts for an IP are halved every 24 hours, so the listing fades once clean traffic replaces the bad. A severe outbreak can take a week or more to be forgotten.

Why is my IP on Truncate when I did not send spam? Truncate reflects what the traffic from the IP looked like to thousands of Message Sniffer nodes, not intent. A compromised account, an infected host, an open relay or a hijacked application on the IP can produce the bad mail that triggers a listing without your knowledge. Find and stop it.

I got removed but was relisted — why? Because the bad traffic returned. Data is collected in real time and the zone updates every 10 minutes, so if the underlying compromise is still active the IP is relisted almost immediately. Removal is not a fix; resolving the source is.

What does a 127.0.0.2 response from Truncate mean? It is the single listing code. It means the queried IPv4 address produces almost exclusively spam, scams, viruses or other malware based on statistics in the global GBUdb network. No answer means the IP is not listed.

The bounce behind the listing.

554 5.7.1 message rejected → The permanent bounce a listing most often triggers — what it means and how to clear it. 550 5.7.1 blocked → A rejection on reputation grounds — usually the same listing, seen from the sender side. Blacklist checker → Re-check your domain and every sending IP once the cause is fixed.

Do not fix it blind.

See every list you are on and every authentication problem behind the listing in one 40-second check — then let monitoring tell you the day a listing comes back.

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