ImproWare Swinog Realtime URI Blacklist (URIBL)
The ImproWare Swinog Realtime URIBL is a domain blocklist (or blacklist) for spam domains. It typically has a low impact on email delivery.
Updated on 17 Jun 2026: We added SWINOG lookup details and tightened the delisting guidance.
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Check if you are listed on ImproWare Swinog Realtime URI Blacklist (URIBL)
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 ImproWare Swinog Realtime URI Blacklist (URIBL)?
The ImproWare Swinog Realtime URI Blacklist (URIBL) is a domain-based blocklist. Unlike IP-based blacklists, this list focuses on the links and domains found inside an email. It lists domain names that have appeared in the body or headers of unsolicited email, commonly known as spam.
This blacklist is built from spamtrap sources. When a spam message reaches a spamtrap, URLs are extracted, checked against a whitelist, and added to the ImproWare Swinog Realtime URI Blacklist (URIBL) when they match its listing rules. Email administrators use this blocklist to score or filter incoming email. If a message contains a domain listed on this blacklist, the receiving system can tag, quarantine, or reject the message based on local policy.
Who runs ImproWare Swinog Realtime URI Blacklist (URIBL)?
The list is operated by ImproWare AG, a Swiss IT company based in Pratteln, Switzerland. ImproWare publishes several antispam DNSBL services, including dnsrbl.swinog.ch, spamrbl.swinog.ch, and uribl.swinog.ch.
For this page, the important service is uribl.swinog.ch, the URI blacklist that checks domains found in message content. It is separate from IP-based blocklists that focus on the mail server that connected to the recipient.
How do I get removed and delisted from ImproWare Swinog Realtime URI Blacklist (URIBL)?
Before requesting removal from any blocklist, identify and resolve the underlying issue that caused the listing. For a URIBL, this means finding out why your domain appeared in spam content. Common causes include a compromised website, a redirect abused by spammers, an affiliate or tracking domain used in unwanted mail, or your own marketing email being reported as spam.
ImproWare provides a manual delisting process through its antispam page. Key points about the removal procedure are:
- There is no charge to request removal from this blacklist.
- Most removal requests are processed within 48 hours.
- You cannot submit a removal request more than once per week.
- The removal process is intended for email administrators, domain owners, and server owners. Regular email users should contact their mail provider instead.
Use the ImproWare antispam page to check a URI address and submit the relevant removal request after the cause has been fixed.
How to check and use ImproWare Swinog URIBL
The lookup zone for the list is uribl.swinog.ch. A mail filter queries domains found inside message URLs against that zone, so a positive result points to URI reputation, not the IP address that sent the email.
Mail filters can use a URIRHSBL-style DNS lookup for this check. Keep any score conservative, because the right action depends on local spam policy and false positive tolerance.
DNS lookup examplebash
# Replace example.com with the domain found in the message URL. dig example.com.uribl.swinog.ch A
A returned A record means the queried domain is listed. Do not query the sending mail server IP for this URI blacklist, because SWINOG URIBL checks domains found in URLs and message content.
What's the impact of being listed on ImproWare Swinog Realtime URI Blacklist (URIBL)?
The impact of being listed on the ImproWare Swinog Realtime URI Blacklist (URIBL) is usually low. A listing means any email containing your domain name in the message body or headers has a higher chance of being filtered, blocked, or sent to the recipient's spam folder by systems that use this blacklist.
The delivery effect depends on whether the recipient's mail filter checks uribl.swinog.ch and how much weight it gives the result. Treat the listing as a warning sign, fix the source of the spam association, then request delisting so the same domain does not keep triggering blocklist or blacklist checks.
