URIBL Multi Domain Name Blacklist
URIBL Multi is a composite blocklist (or blacklist) aggregating domains from URIBL sources to identify domains used for unsolicited email.
Updated on 17 Jun 2026: We updated this guide with URIBL Multi DNS responses, public DNS limits, and clearer delisting steps.
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Check if you are listed on URIBL Multi Domain Name Blacklist
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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 the URIBL Multi Domain Name Blacklist?
The URIBL Multi Domain Name Blacklist, with the zone name multi.uribl.com, is a composite URI and domain DNS blacklist (DNSBL), also known as a right-hand side blocklist (RHSBL). It combines several individual URIBL lists into one query zone so receiving filters can check domains found in message content against a single source.
URIBL lists domains that appear in spam message bodies, not the IP address that sent the email. A listing does not make URIBL block mail directly. Mailbox providers and mail server administrators decide how to score, quarantine, reject, or accept messages that contain a listed domain.
The multi.uribl.com zone is rebuilt when its included component zones are updated. The public URIBL lists most relevant to Multi are:
- black.uribl.com lists domains URIBL associates with spammer-controlled use, including domains found in URIs from unsolicited bulk or commercial email (UBE/UCE).
- grey.uribl.com lists domains found in UBE/UCE that can also have legitimate uses or honor opt-out requests. This blocklist can create false positives depending on how a receiving system defines spam.
- red.uribl.com is an automated monitoring list for domains that appear in mail flow, are not on black.uribl.com, and are very new, monitored, or using WHOIS privacy.
- white.uribl.com is separate from multi.uribl.com. It is not currently bitmasked into Multi, so it requires a separate query if a receiver chooses to use it.
URIBL distributes data through Public DNS, RSS feeds, and Data Feed access for high-volume users.
How URIBL Multi DNS responses work
A multi.uribl.com lookup returns NXDOMAIN when the queried domain is not listed. When it is listed, URIBL returns a 127.0.0.X address where the last number identifies the matching list or an access issue.
Common multi.uribl.com responsestext
Response Meaning NXDOMAIN Domain not listed 127.0.0.2 Listed on black.uribl.com 127.0.0.4 Listed on grey.uribl.com 127.0.0.8 Listed on red.uribl.com 127.0.0.14 Testpoint response for black, grey, and red 127.0.0.1 Query blocked, often due to excessive public DNS use 127.0.0.255 Public mirror access blocked for the resolver
Blocked-query responses are not domain reputation categories. They mean the DNS resolver or querying IP has hit URIBL's public mirror limits or access controls. High-volume senders and filtering providers should not rely on the public mirrors for heavy query traffic.
URIBL usually strips hostnames before listing domains, with exceptions for heavily abused hosted domains. URIBL can also list an IP address when the IP appears as the destination inside a message-body URI. For that case, query the reversed IPv4 value, such as 4.3.2.1.multi.uribl.com for 1.2.3.4.
Who runs the URIBL Multi Domain Name Blacklist?
The URIBL Multi Domain Name Blacklist is operated by URIBL.COM. URIBL.COM is an independent project that distributes information about domain names as they relate to unsolicited email. Its data is intended to supplement existing anti-spam systems.
URIBL.COM maintains its lists, but it does not register domains, host websites, or suspend domain names. Some domain registrars use URIBL data to place holds on domains listed on black.uribl.com, but that action is controlled by the registrar.
How do I get delisted from the URIBL Multi Domain Name Blacklist?
If your domain is on this blacklist, use the official lookup and submission form on the URIBL website to request removal. URIBL does not provide feedback on why a domain was listed, does not whitelist by request, and does not respond to delisting requests sent by email.
Before requesting delisting, resolve the issue that caused the listing. For a URI blocklist, that often means checking compromised pages, abused redirects, tracking links, user-generated content, affiliate traffic, and any mail campaigns that included the listed domain.
- Use the lookup tool on the URIBL website to confirm the domain's listing status.
- Investigate where the listed domain appears in recent email, especially links, redirects, image hosts, and landing pages.
- Remove or disable abusive content before submitting the delist request.
- Register for an account on the URIBL website because an account is required for delisting submissions.
- Use the same lookup form to submit the request. You can submit it here.
What is the impact of a URIBL Multi listing?
The impact of being on the URIBL Multi Domain Name blocklist is usually medium, but it depends on the receiving system and the list that matched. Messages containing a listed domain are more likely to be scored as spam, placed in the junk folder, quarantined, or rejected by receiving mail servers.
The severity varies by sub-list. A black.uribl.com listing has the highest risk and can lead some registrars to place a domain on hold. Grey and red listings also affect deliverability, but they are generally less severe and depend more heavily on the recipient's filtering policy.
Passing SPF, DKIM, and DMARC does not clear a URIBL listing. Those checks authenticate the sender and confirm domain identity relationships, while URIBL evaluates domains and URI destinations inside the message content.
Other 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 Red Domain Name Blacklist
Organization
URIBL
Zone
red.uribl.com
Type
Domain
Impact
Medium
Delisting
Manual
