Ascams DNSBL Block List
The Ascams DNSBL blocklist (blacklist) identifies IPs involved in spam and malicious activity using a reputation scoring system.
Updated on 18 Jun 2026: We updated this guide with clearer Ascams removal rules, recurrence checks, and practical mail authentication steps.
Summarize with
Check if you are listed on Ascams DNSBL Block List
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 the Ascams DNSBL blocklist?
The Ascams DNSBL blocklist (dnsbl.ascams.com) is an IP-based blacklist used as a DROP list. A system using it is meant to drop or block connections from listed IPs, not just tag the traffic as suspicious.
Ascams lists IP addresses and IP resources connected to hacking, malware distribution, general abuse, and spam. It also includes non-managed IP ranges, hijacked ASNs, and dynamic IP ranges that Ascams considers unsafe to receive connections from.
Listings on this blocklist fall into two main categories, which matters when you are deciding whether to wait, investigate, or request manual removal.
- Permanent listings require a manual delisting request before Ascams removes the IP.
- Temporary listings are removed automatically once the IP stops hitting Ascams spam traps. For a temporary listing, fix the leak first and then allow the listing to clear.
Who runs Ascams DNSBL blocklist?
The Ascams DNSBL blocklist is operated by Ascams, an organization run by an individual named Del. Ascams maintains a reputation scoring system for a large number of IPv4 addresses and IP resources.
When a score is requested for an IP, Ascams cross-references it with other data providers to keep the information current. The score uses data points such as bounce messages, PTR records, SPF records, RBL listings, reverse DNS, and records of scam or malware activity. Ascams members can request manual re-evaluations and can sometimes view the data contributing to an IP's score.
How do I get removed from Ascams DNSBL blocklist?
The removal process from the Ascams DNSBL blocklist depends on whether your listing is temporary or permanent. Temporary listings are removed automatically once the abusive traffic stops. For these, the main task is to plug the leak that caused the trap hits.
For permanent listings, delisting is manual and requires an investigation for each IP address. Removal is free for resources that qualify, but there are no instant delisting options. Removals can take 7 to 30 days or longer.
Before you request removal, investigate why the IP was listed and resolve the underlying issue. Ascams expects you to check the basics first.
- Confirm whether you recently acquired the IP address or have been its exclusive user for years.
- Check whether you control all traffic originating from the IP address.
- Review email server and web server logs to identify the source of the abuse.
- Confirm the mail server is not an open relay, reverse DNS matches forward DNS, and SPF records are present for sending domains.
- Check whether the IP provider has a history of responding to abuse reports and cleaning problem ranges.
If you are not a member, follow the email checklist exactly. Ascams says requests that do not comply are discarded, and multiple requests can be treated as abuse.
- Send the request from the official abuse-c email address listed in the public WHOIS record for the IP.
- Request removal for one single IP address per 30-day period. Ascams does not accept IP range removal requests through this process.
- Send the email to dnsbl@ascams.com with the subject line "Removal" followed by the IP address. Include complete contact information and a clear explanation for the request.
The success of your delisting request also depends on the reputation of the IP resource owner. If the owner has a poor Ascams score, a client or renter of the IP may not be able to get the listing removed without the owner's direct involvement. Check the IP reputation before paying for a new server or taking over a transferred IP resource.
How to stop an Ascams DNSBL listing from coming back
Ascams listings are usually tied to traffic, not the brand name on a domain. A clean DNSBL removal request has a better chance when you can show that the listed IP no longer sends abusive traffic and that the network owner can keep it clean.
- Review outbound SMTP logs for compromised mailboxes, high-volume scripts, weak authentication, and unusual sending patterns.
- Check web server logs for hacked forms, vulnerable CMS plugins, injected mail scripts, and malware callbacks.
- Confirm reverse DNS, forward DNS, HELO/EHLO identity, SPF, DKIM, and DMARC alignment for legitimate mail streams.
- Separate shared hosting or dynamic customer traffic from production mail infrastructure so one compromised tenant does not damage the same sending IP.
- Keep evidence of the fix, including timestamps, affected accounts, removed malware, closed relays, and abuse reports handled by the IP owner.
For mail tied to your own domains, Suped's DMARC reporting can help compare aggregate reports with outbound mail logs so you can identify authorized senders, unknown sources, and authentication failures. It will not remove an Ascams blacklist entry by itself, because the listing is still tied to IP-level abuse.
What's the impact of being listed on Ascams DNSBL blocklist?
The impact of being on the Ascams DNSBL blocklist is usually limited unless your recipients use this blacklist (or blocklist) in their mail or network filtering. It is not known as a list that large mailbox providers commonly use for broad consumer mailbox filtering.
The impact can still be severe for any network that does use it. Because Ascams DNSBL is a DROP list, those systems can reject or block all connection attempts from the listed IP address. That can cause email delivery failures and blocked network traffic for those specific recipients.
Other Ascams DNSBL blocklists
Ascams Block Scoring List
Organization
Ascams
Zone
block.ascams.com
Type
Score
Impact
Low
Delisting
Manual
Ascams Mix Scoring Black List (SBL)
Organization
Ascams
Zone
mix.ascams.com
Type
Score
Impact
Low
Delisting
Manual
Ascams Super Block Scoring List
Organization
Ascams
Zone
superblock.ascams.com
Type
Score
Impact
Low
Delisting
Manual
