URIBL Red Domain Name Blacklist
URIBL Red is an automated domain blacklist and blocklist for domains flagged in email traffic that are new, use WHOIS privacy, or are under observation.
Updated on 17 Jun 2026: We tightened the URIBL Red guidance around URI-based checks, delisting, and likely deliverability impact.
Summarize with
Check if you are listed on URIBL Red Domain Name 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 URIBL Red Domain Name Blacklist?
The URIBL Red Domain Name Blacklist is a domain name blocklist managed by URIBL.COM. Unlike more severe blacklists, it is automated and acts as a caution signal. URIBL says Red contains domains that appear in mail flow, are not listed on URIBL Black, and match monitoring, domain age, or WHOIS privacy criteria.
A domain might be added because it is under monitoring, very new, or using WHOIS privacy features that hide ownership details. Because Red is automated, URIBL advises caution: legitimate domains can appear on this blacklist. Most filtering systems should use Red as one input in a spam score, not as the sole reason to reject email.
Who runs URIBL Red Domain Name Blacklist?
URIBL Red is operated by URIBL.COM. URIBL collects and publishes data about domain names associated with unsolicited bulk email (UBE) and unsolicited commercial email (UCE). Its data is distributed through public DNS, RSS feeds, private rsync data feeds, and Datafeed over DNS for higher-volume users.
URIBL Red is part of URIBL's public list set, alongside URIBL Black, Grey, White, and multi.uribl.com. multi.uribl.com combines the public list responses, except White, so receiving systems can make one DNS query and read the returned bit value.
How URIBL Red is checked
URIBL Red is a URI blacklist and blocklist. It checks domains and destination IP addresses found in links inside an email body. It does not list the IP address that sent the message, and it does not mean the sender's mail server is on an IP blacklist.
For domains, URIBL usually strips the host part before listing or querying, so a full URL with a subdomain and path should be reduced to the registrable domain before lookup. URIBL can list subdomains for heavily abused shared hosting domains, so use the same parsing logic as your mail filter or the official lookup workflow when investigating a real listing.
URIBL Red DNS exampleBASH
# Query a domain against multi.uribl.com host -t A example.com.multi.uribl.com # 127.0.0.8 means the domain is on URIBL Red # NXDOMAIN means the queried domain is not listed
How do I get delisted from URIBL Red Domain Name Blacklist?
To remove your domain from this blocklist, use the official lookup and submission workflow on the URIBL website. Emailing URIBL directly with a delisting request will not receive a response. Before requesting removal, fix the condition that caused the listing, such as a compromised website, unwanted redirects, abusive links in outbound email, or a newly registered domain being used too aggressively.
The lookup tool requires a registered account before you can submit a removal request. URIBL also states that it will not provide trap data, listing evidence, or a whitelist by request.
- Submit through the official form. Delisting requests must go through the URIBL website. You can start on its admin portal. You will need an account to proceed.
- Confirm the listing source. Make sure the domain is listed by URIBL before you treat it as a URIBL Red problem. A receiving system can use several DNS-based lists at the same time.
- Fix the mail and web cause first. Check outbound campaigns, link shorteners, compromised pages, tracking domains, redirects, and domains that were registered shortly before sending.
- Do not expect a reason. URIBL says it does not provide feedback loops or disclose reported and trap data.
- Do not request whitelisting. URIBL's internal whitelist is for its own administration and is not a reputation endorsement.
What is the impact of a URIBL Red listing?
The impact of a URIBL Red listing is usually medium. Red is an automated warning list (blacklist) tied to domains in message links, domain age, monitoring status, and WHOIS privacy. It is less severe than a confirmed abusive-domain listing, but it can still influence filtering decisions.
URIBL states that its lists are intended to help anti-spam systems tag messages rather than block mail directly. In practice, a receiving system can add negative score, send the message to spam, quarantine it, or reject it if other signals are also poor. Treat a Red listing as a sign to review the domains in your email body, not just SPF, DKIM, DMARC, or sending IP reputation.
For legitimate senders, the common fix is to clean up the linked domain behavior: remove compromised URLs, stop sending with brand-new tracking domains, avoid unnecessary redirects, and keep registration details consistent. Then submit the delisting request once the domain no longer matches the Red criteria.
Other URIBL blocklists
URIBL Black Domain Name Blacklist
Organization
URIBL
Zone
black.uribl.com
Type
Domain
Impact
Medium
Delisting
Manual
URIBL Grey Domain Name Blacklist
Organization
URIBL
Zone
grey.uribl.com
Type
Domain
Impact
Medium
Delisting
Manual
URIBL Multi Domain Name Blacklist
Organization
URIBL
Zone
multi.uribl.com
Type
Domain
Impact
Medium
Delisting
Manual
