TechTheft Domain Blacklist

TechTheft Domain Blacklist is an IP blocklist that identifies spam-support domains and virus-infected hosts to mitigate high-technology theft.

Updated on 17 Jun 2026: We updated this guide with clearer diagnosis steps for a private IP-based blocklist and more practical delisting guidance.

Summarize with

Check if you are listed on TechTheft Domain Blacklist

And 143 other blocklists.

Spamhaus

0Spam

Abusix

Barracuda Networks

Cisco

Mailspike

NoSolicitado

SURBL

UCEPROTECT

URIBL

8086 Consultancy

abuse.ro

ALPHANET

Anonmails

Ascams

BLOCKEDSERVERS

Brukalai.lt

Calivent Networks

dan.me.uk

DrMx

DroneBL

EFnet

Fabel

GBUdb

ImproWare

JIPPG Technologies

Junk Email Filter

JustSpam

Kempt.net

Mail Baby

NordSpam

nsZones

Polspam

RV-SOFT Technology

Schulte

Scientific Spam

Spam Eating Monkey

Spamikaze

SpamRATS

SPFBL

Suomispam

System 5 Hosting

Taughannock Networks

Team Cymru

Tornevall Networks

Validity

www.blocklist.de Fail2Ban-Reporting Service

ZapBL

2stepback.dk

Fayntic Services

ORB UK

RedHawk

technoirc.org

TechTheft

Spamhaus

0Spam

Abusix

Barracuda Networks

Cisco

Mailspike

NoSolicitado

SURBL

UCEPROTECT

URIBL

8086 Consultancy

abuse.ro

ALPHANET

Anonmails

Ascams

BLOCKEDSERVERS

Brukalai.lt

Calivent Networks

dan.me.uk

DrMx

DroneBL

EFnet

Fabel

GBUdb

ImproWare

JIPPG Technologies

Junk Email Filter

JustSpam

Kempt.net

Mail Baby

NordSpam

nsZones

Polspam

RV-SOFT Technology

Schulte

Scientific Spam

Spam Eating Monkey

Spamikaze

SpamRATS

SPFBL

Suomispam

System 5 Hosting

Taughannock Networks

Team Cymru

Tornevall Networks

Validity

www.blocklist.de Fail2Ban-Reporting Service

ZapBL

2stepback.dk

Fayntic Services

ORB UK

RedHawk

technoirc.org

TechTheft

Spamhaus

0Spam

Abusix

Barracuda Networks

Cisco

Mailspike

NoSolicitado

SURBL

UCEPROTECT

URIBL

8086 Consultancy

abuse.ro

ALPHANET

Anonmails

Ascams

BLOCKEDSERVERS

Brukalai.lt

Calivent Networks

dan.me.uk

DrMx

DroneBL

EFnet

Fabel

GBUdb

ImproWare

JIPPG Technologies

Junk Email Filter

JustSpam

Kempt.net

Mail Baby

NordSpam

nsZones

Polspam

RV-SOFT Technology

Schulte

Scientific Spam

Spam Eating Monkey

Spamikaze

SpamRATS

SPFBL

Suomispam

System 5 Hosting

Taughannock Networks

Team Cymru

Tornevall Networks

Validity

www.blocklist.de Fail2Ban-Reporting Service

ZapBL

2stepback.dk

Fayntic Services

ORB UK

RedHawk

technoirc.org

TechTheft

Spamhaus

0Spam

Abusix

Barracuda Networks

Cisco

Mailspike

NoSolicitado

SURBL

UCEPROTECT

URIBL

8086 Consultancy

abuse.ro

ALPHANET

Anonmails

Ascams

BLOCKEDSERVERS

Brukalai.lt

Calivent Networks

dan.me.uk

DrMx

DroneBL

EFnet

Fabel

GBUdb

ImproWare

JIPPG Technologies

Junk Email Filter

JustSpam

Kempt.net

Mail Baby

NordSpam

nsZones

Polspam

RV-SOFT Technology

Schulte

Scientific Spam

Spam Eating Monkey

Spamikaze

SpamRATS

SPFBL

Suomispam

System 5 Hosting

Taughannock Networks

Team Cymru

Tornevall Networks

Validity

www.blocklist.de Fail2Ban-Reporting Service

ZapBL

2stepback.dk

Fayntic Services

ORB UK

RedHawk

technoirc.org

TechTheft

Spamhaus

0Spam

Abusix

Barracuda Networks

Cisco

Mailspike

NoSolicitado

SURBL

UCEPROTECT

URIBL

8086 Consultancy

abuse.ro

ALPHANET

Anonmails

Ascams

BLOCKEDSERVERS

Brukalai.lt

Calivent Networks

dan.me.uk

DrMx

DroneBL

EFnet

Fabel

GBUdb

ImproWare

JIPPG Technologies

Junk Email Filter

JustSpam

Kempt.net

Mail Baby

NordSpam

nsZones

Polspam

RV-SOFT Technology

Schulte

Scientific Spam

Spam Eating Monkey

Spamikaze

SpamRATS

SPFBL

Suomispam

System 5 Hosting

Taughannock Networks

Team Cymru

Tornevall Networks

Validity

www.blocklist.de Fail2Ban-Reporting Service

ZapBL

2stepback.dk

Fayntic Services

ORB UK

RedHawk

technoirc.org

TechTheft

What is TechTheft Domain Blacklist?

The TechTheft Domain Blacklist is a semi-automatic, IP-based blocklist (blacklist). Despite the domain-focused name, its blocking decisions are tied to IP addresses that host or support abusive domains. Listings are added automatically from spam trap data and also incorporate domains listed by spamsites.org. This blocklist focuses on identifying and blocking the infrastructure that supports spam and other malicious activity, not just the source of spam emails.

According to its operators, this is a private list available only for internal use by trusted subscribers who receive access by invitation only. That means a normal public blacklist lookup will not always confirm whether TechTheft is involved. Its policy is to block IPs associated with spam supporters, which can cause collateral damage on densely populated hosts. This blacklist targets a wide range of abusive sources:

IP addresses of machines hosting domains owned by known spammers.
IPs of domains included on the spamsites.org list.
Domains selling software or services created for spammers.
Services offering "bulletproof hosting" for malicious actors.
Virus-infected machines, compromised websites, and web crawling agents.

Who runs TechTheft Domain Blacklist?

TechTheft describes itself as a collaborative effort by administrators and hobbyists dedicated to fighting "Hi-Technology Theft", which includes spam, viral attacks, and IP hijacking. The group's philosophy is to implement an "Internet Death Penalty" against sources and supporters of internet abuse. Their policy is to block the source of abuse and the infrastructure that enables it, instead of only filtering abusive messages after they arrive.

How do I check whether TechTheft is affecting delivery?

Because TechTheft Domain Blacklist is private, the most reliable evidence usually comes from SMTP bounce messages, mail server logs, or the recipient's postmaster team. Look for rejection text that names TechTheft, references spam-support hosting, or points to an IP-based blacklist decision. If the bounce only says the message was rejected by policy, ask the recipient's mail administrator which blocklist or blacklist rule matched.

Check the sending IP first, not only the visible domain in the email address. Shared hosting, forwarded mail, compromised websites, and third-party sending infrastructure can all connect your domain to an IP with a poor reputation. Review recent sending logs, web server changes, malware scans, and abuse reports before assuming the listing is a false positive.

How do I get removed and delisted from TechTheft Domain Blacklist?

Removal from the TechTheft Domain Blacklist is automatic. There is no manual delisting request form or public contact path. A listing is removed only when the underlying issue has been resolved. The operators state that a listing will disappear when the "domain or spammer dies", so the practical path is to remove the abuse source and keep it from returning.

Before a listing can clear, confirm that you can receive and act on abuse complaints. Maintain a working abuse@ mailbox for your domain, keep WHOIS or RDAP abuse contacts current for any IP ranges you control, and make sure your hosting provider forwards abuse reports quickly. Then fix the source of the complaint, such as a compromised website, spam-support service, infected host, open relay, or abusive customer on a shared IP.

Once the abuse stops and active complaints are resolved, the affected IP should age out of the blocklist automatically. If you use a shared host or cloud provider, you may need to move outbound mail to a clean, dedicated sending IP or ask the provider to remove the abusive account from the server.

What's the impact of being listed on TechTheft Domain Blacklist?

The internet-wide impact of this specific blacklist is limited because it is a private list used by a select group of trusted subscribers. It will not affect delivery everywhere, but it can block mail completely at networks and services that subscribe to it. For senders trying to reach those recipients, the impact can be severe until the listed IP is cleaned up or replaced. The operators also note a risk of "some collateral damage on dense hosts", meaning legitimate senders sharing an IP with a bad actor can be affected.