TechTheft ISP Blacklist
The TechTheft ISP blacklist is a private IP blocklist. It lists network ranges under an internet boycott for unresolved abuse complaints.
Updated on 17 Jun 2026: We updated this guide to clarify TechTheft's private list scope, provider-level escalation, and mail authentication checks.
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Check if you are listed on TechTheft ISP Blacklist
And 143 other blocklists.
Spamhaus
0Spam
Cisco
NoSolicitado
URIBL
abuse.ro
ALPHANET
Anonmails
Ascams
BLOCKEDSERVERS
Calivent Networks
EFnet
JustSpam
Kempt.net
NordSpam
RV-SOFT Technology
Scientific Spam
Spamikaze
SpamRATS
SPFBL
Suomispam
System 5 Hosting
Team Cymru
Validity
www.blocklist.de Fail2Ban-Reporting Service
ZapBL
2stepback.dk
Fayntic Services
ORB UK
technoirc.org
TechTheftSpamhaus0SpamCiscoNoSolicitadoURIBLabuse.roALPHANETAnonmailsAscamsBLOCKEDSERVERSCalivent NetworksEFnetJustSpamKempt.netNordSpamRV-SOFT TechnologyScientific SpamSpamikazeSpamRATSSPFBLSuomispamSystem 5 HostingTeam CymruValiditywww.blocklist.de Fail2Ban-Reporting ServiceZapBL2stepback.dkFayntic ServicesORB UKtechnoirc.orgTechTheftSpamhaus0SpamCiscoNoSolicitadoURIBLabuse.roALPHANETAnonmailsAscamsBLOCKEDSERVERSCalivent NetworksEFnetJustSpamKempt.netNordSpamRV-SOFT TechnologyScientific SpamSpamikazeSpamRATSSPFBLSuomispamSystem 5 HostingTeam CymruValiditywww.blocklist.de Fail2Ban-Reporting ServiceZapBL2stepback.dkFayntic ServicesORB UKtechnoirc.orgTechTheftSpamhaus0SpamCiscoNoSolicitadoURIBLabuse.roALPHANETAnonmailsAscamsBLOCKEDSERVERSCalivent NetworksEFnetJustSpamKempt.netNordSpamRV-SOFT TechnologyScientific SpamSpamikazeSpamRATSSPFBLSuomispamSystem 5 HostingTeam CymruValiditywww.blocklist.de Fail2Ban-Reporting ServiceZapBL2stepback.dkFayntic ServicesORB UKtechnoirc.orgTechTheftSpamhaus0SpamCiscoNoSolicitadoURIBLabuse.roALPHANETAnonmailsAscamsBLOCKEDSERVERSCalivent NetworksEFnetJustSpamKempt.netNordSpamRV-SOFT TechnologyScientific SpamSpamikazeSpamRATSSPFBLSuomispamSystem 5 HostingTeam CymruValiditywww.blocklist.de Fail2Ban-Reporting ServiceZapBL2stepback.dkFayntic ServicesORB UKtechnoirc.orgTechTheftWhat is TechTheft ISP Blacklist?
The TechTheft ISP Blacklist (isp.bl.techtheft.info) is a private, DNSBL-style, IP-based blacklist that lists network ranges belonging to Internet Service Providers (ISPs) that TechTheft considers to be under an "internet boycott". The listing policy is described as semi-automatic, with additions based on data collected from their spam and network attack traps. Any internet asset that interacts with these traps can be listed, including email servers, DNS nameservers, and entire network IP blocks.
A listing typically occurs when a network abuse complaint has been made and, according to TechTheft, has not been resolved. Their policy is to block on sight, and they recommend that users firewall listed IPs where possible. As this is a private blocklist, it is only available for internal use by subscribers who are granted access by invitation only.
Who runs TechTheft ISP Blacklist?
The blacklist is run by an organization called TechTheft. They describe their mission as a fight against "Hi-Technology Theft", which includes spam, viral attacks, DDoS attacks, and IP or PC hijacking. The group advocates for a strict stance against sources of internet abuse, using the term "Internet Death Penalty" for cutting off offending sources and their supporters entirely. They aim to provide a collaboration point for others who want to combat technology abuse.
How do I get removed from TechTheft ISP Blacklist?
Removal from this blocklist depends on resolving the underlying issues that led to the listing. The core principle is that once the source of the abuse is stopped and all boycott conditions are met, the listing will be removed automatically. TechTheft provides a way to see open complaints related to your IP to help identify the problem.
Before requesting delisting, take these steps:
- Use the complaint information from TechTheft to find the root cause of the listing, such as a compromised machine, misconfigured server, open relay, or abusive user on your network.
- Fix every active complaint and remove the source of the abuse completely before expecting the blacklist or blocklist entry to clear.
- Maintain a functioning abuse@ address for the IP network and the relevant domain name, and monitor it so future complaints are handled quickly.
- If the listed range belongs to a hosting provider or ISP, open a ticket with that provider's abuse desk because they control the network-level remediation.
The material for this private list does not give a manual delisting link or public appeal process. Removal is automatic once all abuse complaints are resolved.
What to check before delisting
Before treating this as a standard email blacklist removal task, confirm the exact scope of the listing. TechTheft ISP Blacklist can involve provider-level network ranges, so the owner of one affected domain or mail server does not always control the fix.
- Confirm whether the listed asset is your sending IP, your provider's IP range, a DNS nameserver, or another internet-facing system.
- Check for current abuse signals before escalating, including spam traps, malware traffic, open proxies, open relays, and compromised hosts.
- For outbound email, verify SPF, DKIM, and DMARC alignment for every legitimate sender. Suped's DMARC reporting can help map sending sources and separate authentication failures from blacklist symptoms.
- If only one recipient organization blocks the connection, document the rejection message and confirm whether that organization uses TechTheft internally.
What's the impact of being listed on TechTheft ISP Blacklist?
The impact of being listed on the TechTheft ISP Blacklist is generally low because it is a private blacklist (or blocklist) available only to invited subscribers. The effect depends on how a subscriber uses the list. A subscriber can reject SMTP connections, block traffic at a firewall, or filter access to DNS and web services tied to a listed network range.
For most senders and site owners, this specific listing has no broad deliverability impact. It matters when you are sending email to, or receiving traffic from, an organization that specifically subscribes to and enforces this list.
Other blocklists
TechTheft Bad Whois Blacklist
Organization
TechTheft
Zone
bad.whois.bl.techtheft.info
Type
Domain
Impact
Inactive
Delisting
Manual
TechTheft Blacklist
Organization
TechTheft
Zone
bl.techtheft.info
Type
IP
Impact
Inactive
Delisting
Manual
TechTheft Bogon Blacklist
Organization
TechTheft
Zone
bogon.bl.techtheft.info
Type
IP
Impact
Inactive
Delisting
Manual
TechTheft Conferr Blacklist
Organization
TechTheft
Zone
conferr.bl.techtheft.info
Type
IP
Impact
Inactive
Delisting
Manual
TechTheft Domain Blacklist
Organization
TechTheft
Zone
domain.bl.techtheft.info
Type
IP
Impact
Inactive
Delisting
Manual
TechTheft Expanded Blacklist
Organization
TechTheft
Zone
expanded.bl.techtheft.info
Type
IP
Impact
Inactive
Delisting
Manual
TechTheft Nana Blacklist
Organization
TechTheft
Zone
nana.bl.techtheft.info
Type
IP
Impact
Inactive
Delisting
Manual
TechTheft Other Blacklist
Organization
TechTheft
Zone
other.bl.techtheft.info
Type
IP
Impact
Inactive
Delisting
Manual
TechTheft Robot Blacklist
Organization
TechTheft
Zone
robot.bl.techtheft.info
Type
IP
Impact
Inactive
Delisting
Manual
TechTheft Scanning Blacklist
Organization
TechTheft
Zone
scanning.bl.techtheft.info
Type
IP
Impact
Inactive
Delisting
Manual
TechTheft Source Blacklist
Organization
TechTheft
Zone
source.bl.techtheft.info
Type
IP
Impact
Inactive
Delisting
Manual
TechTheft Support Blacklist
Organization
TechTheft
Zone
support.bl.techtheft.info
Type
IP
Impact
Inactive
Delisting
Manual
TechTheft Virus Blacklist
Organization
TechTheft
Zone
virus.bl.techtheft.info
Type
IP
Impact
Inactive
Delisting
Manual
TechTheft Watchlist Blacklist
Organization
TechTheft
Zone
watchlist.bl.techtheft.info
Type
IP
Impact
Inactive
Delisting
Manual
TechTheft Web Blacklist
Organization
TechTheft
Zone
web.bl.techtheft.info
Type
IP
Impact
Inactive
Delisting
Manual
