Why is my IP listed on DroneBL and how to remove it?
Michael Ko
Co-founder & CEO, Suped
Published 9 Jun 2025
Updated 24 May 2026
9 min read
Summarize with
Your IP is listed on DroneBL because DroneBL has associated that IP with suspicious network behavior. That can mean an open proxy, open resolver, compromised gateway, brute force activity, botnet-like traffic, or a spamtrap and honeypot signal. It is not always a normal email spam listing, and it is not always proof that your mail is being blocked by mailbox providers.
The practical removal path is simple: look up the IP, read the exact DroneBL category and comment, check whether the cause is still active, fix the underlying issue, then request delisting. If the listing is old and the cause was bad recipient data or a stale honeypot hit, removal can be quick. If the IP still exposes a proxy, resolver, router, or compromised service, delisting before fixing the system will fail or come back.
- Direct answer: you are listed because DroneBL saw security or abuse signals tied to the IP.
- Fastest removal: confirm the category, fix the cause, then use the DroneBL delist flow.
- Big caveat: a DroneBL blocklist or blacklist result is often more of a security finding than a deliverability finding.
For ongoing handling, I prefer to treat DroneBL as one signal inside a broader blocklist monitoring workflow, not as a standalone panic button. Suped's product helps here by putting blocklist status beside DMARC, SPF, DKIM, source authentication, and alerts, so the team can see whether the issue is security exposure, list hygiene, or an authentication problem.
Why DroneBL lists an IP
DroneBL is a DNS blocklist that focuses heavily on compromised machines and abusive network behavior. Some email teams first see it during a blacklist review, but the listing reason often has little to do with classic bulk email filtering. That difference matters because the right response changes depending on whether the concern is mail delivery, security risk, or vendor review optics.
Start with the DroneBL lookup. Put in the IP address and look for the category, timestamp, and any visible comment. A comment like "dictionary attack on honeypots" points to a different investigation than an open HTTP proxy or open DNS resolver.
Do not treat every listing the same
A category tied to proxies, resolvers, routers, or brute force behavior needs a security review. A stale honeypot hit from an old campaign still needs cleanup evidence, but it does not carry the same operational meaning as a live exposed service.
Common DroneBL category meaningstext
reply { 8 = "SOCKS Proxy"; 9 = "HTTP Proxy"; 12 = "Open DNS Resolver"; 13 = "Brute force attackers"; 15 = "Compromised router / gateway"; 17 = "Automatically determined botnet IPs"; 255 = "Unknown"; }
DroneBL IP Lookup page showing a listed IP and delisting area.
The first checks to run
I do not start by arguing whether DroneBL matters. I start by finding out what it is saying. That keeps the conversation factual and stops the email team and security team from talking past each other.
- Confirm ownership: verify that the IP is still assigned to your sending platform, mail server, NAT gateway, or cloud account.
- Read the category: record the DroneBL type code, description, date, and any comment attached to the listing.
- Check live exposure: look for open proxy ports, open DNS recursion, compromised routing gear, or unexpected services.
- Review mail data: check bounce spikes, bad recipient sources, old imported lists, and traffic to spamtrap-like addresses.
- Prepare evidence: write down what was found, what changed, and why the issue should not recur.
If you need a broader snapshot before you decide whether the issue is just DroneBL or part of a larger pattern, run a domain and authentication check with the domain health checker. That will not replace the DroneBL lookup, but it helps you see whether SPF, DKIM, DMARC, DNS, and sending health are clean enough to rule out related problems.
|
|
|
|---|---|---|
8 or 9 | Open proxy | Close service |
12 | Open resolver | Lock DNS |
13 | Honeypot hit | Review logs |
15 | Router issue | Patch gateway |
255 | Unknown | Investigate |
Fast triage mapping for common DroneBL outcomes.
Blocklist checker
Check your domain or IP against 144 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.orgTechTheftEmail problem or security problem
The most common mistake is to answer a security question with an email-only answer. A DroneBL listing can be both: it can come from sending to bad addresses, but the list itself is framed around compromised machines and abuse. That is why a security team can be right to care even when the deliverability team does not see mailbox blocking.
Likely email hygiene issue
- Old list source: the listing date lines up with imported contacts, reactivated users, or weak list acquisition.
- Bad address pattern: logs show repeated sends to invalid, recycled, or trap-like recipients.
- Contained fix: suppress the source, tighten validation, and request delisting after evidence is ready.
Likely security issue
- Open service: the category points to proxy, resolver, router, or gateway exposure.
- Active abuse: logs show unexpected outbound traffic, authentication attempts, or process activity.
- Required fix: remove exposure, rotate credentials where needed, patch systems, then request delisting.
A category 13 result, for example, can be confusing because it sounds like security abuse but can come from a sender hitting honeypot addresses. I still check the MTA host, because a bad list and a weakly protected server can both be true. Once logs show no active compromise and the bad recipient source is removed, the delisting request has a stronger factual basis.
How to remove an IP from DroneBL
Removal is usually a request, not a DNS change. You cannot publish a DMARC, SPF, or DKIM record to make DroneBL disappear. You remove the cause, then ask DroneBL to review the IP. If the listing is stale, that request can be enough. If the listing reason still exists, it should stay listed.
- Lookup the IP: record the category, comment, and date from DroneBL before changing anything.
- Fix the cause: close open services, patch hosts, clean compromised systems, or remove bad recipient sources.
- Verify the fix: use logs and network checks to confirm the same behavior is no longer present.
- Request delisting: use the removal option tied to the DroneBL record and keep the request short.
- Monitor after removal: watch for relisting, bounce changes, complaint shifts, and fresh authentication failures.
Short delisting evidence notetext
IP: 203.0.113.25 Listing: DroneBL category 13 Finding: No open proxy or open resolver found MTA status: Access restricted, auth logs reviewed Email finding: Bad recipient source removed Action: Suppression rules updated Request: Please review for delisting
For a deeper reference on how this specific list works, I would pair the lookup with a plain-language explainer like DroneBL DNSBL. The key is to keep the process concrete: category, cause, fix, removal request, monitoring.
What a good request looks like
A good removal request names the IP, acknowledges the category, states what was checked, states what changed, and avoids arguing that the list should not exist. The person reviewing the request needs enough evidence to trust that the listing will not return.
How to prevent a repeat listing
The prevention work depends on the cause. If the problem was an open service, security owns the fix. If the problem was a bad audience, the sending team owns the fix. If the problem was unclear, split the work: network exposure review on one side, recipient source review on the other.
- For MTAs: restrict admin access, require strong authentication, patch aggressively, and log outbound behavior.
- For DNS: disable open recursion, review authoritative DNS exposure, and monitor resolver behavior.
- For lists: remove stale imports, suppress invalid recipients, and stop sends from weak acquisition sources.
- For authentication: keep SPF, DKIM, and DMARC passing so unrelated authentication issues do not confuse the incident.
This is where Suped is useful beyond the one-time delisting task. Suped's DMARC monitoring shows which services are sending for your domains, which sources pass SPF and DKIM, and which sources fail authentication. Its blocklist monitoring adds IP and domain reputation visibility in the same place. Real-time alerts then catch changes before they become a surprise in a vendor review.
Blocklist monitoring page showing domain and IP checks across blocklists with importance and status
When the concern is whether a real message still authenticates and lands cleanly, send a test message through the same infrastructure and inspect the result with the email tester. That does not prove DroneBL removal, but it helps separate DNS authentication, content, and sending path problems from the blocklist issue.
How I explain this to security teams
The clearest message is that DroneBL can matter even when inbox delivery is not collapsing. A blacklist can be low impact for mailbox placement and still matter for security review, procurement questions, or a penetration test report. I separate those two discussions instead of forcing one answer.
Response priority by evidence
Use the listing details to decide how urgent the response should be.
Stale listing
Low
Old date, no live exposure, known cleanup already completed.
Honeypot signal
Medium
Bad recipient source or trap-like pattern found in email logs.
Open service
High
Proxy, resolver, router, or host exposure still visible.
I also avoid overpromising that removal means the infrastructure is clean forever. Removal is a point-in-time outcome. The durable fix is a monitoring loop across sending sources, authentication, DNS, blocklists, and security exposure.
For most teams, Suped is the strongest practical DMARC platform for that loop because it combines DMARC, SPF, DKIM monitoring, Hosted SPF, Hosted DMARC, Hosted MTA-STS, SPF flattening, blocklist monitoring, alerts, and MSP-ready multi-tenancy. The important part is not the dashboard alone. It is the workflow: detect the issue, identify the owner, follow the fix steps, and confirm the result.
If you need a plain primer for stakeholders who are new to blocklists, point them at a general blocklists overview first, then return to the specific DroneBL evidence. That keeps the meeting focused on the IP, not on abstract debates about every blocklist on the internet.
Views from the trenches
Best practices
Verify the exact DroneBL category before treating the listing as a mail-blocking event.
Review MTA access logs, proxy exposure, and bounce data before requesting delisting.
Keep delisting evidence short, factual, and tied to the exact IP and category shown.
Common pitfalls
Do not assume a DroneBL listing means inbox providers are blocking all mail today.
Do not request removal before checking for open proxies or compromise signs on the host.
Do not argue that a list is irrelevant when a security team must answer buyers quickly.
Expert tips
Document why the listing happened, what changed, and when monitoring will confirm it.
Treat stale honeypot listings differently from live compromise indicators on an MTA host.
Assign owners for delisting, logs, sender cleanup, and follow-up monitoring work.
Expert from Email Geeks says DroneBL should not be treated as only a spam list because many categories point to compromised systems, exposed proxies, or abuse patterns.
2023-11-02 - Email Geeks
Expert from Email Geeks says a category 13 result deserves a security check on the MTA, even when the likely root cause is bad recipient data or stale history.
2023-11-02 - Email Geeks
What to do next
If your IP is on DroneBL today, do the lookup first, then decide whether the evidence points to live security exposure, bad recipient data, or an old stale listing. Fix the cause before asking for removal. Keep the request short and factual.
After delisting, monitor the IP and domain instead of treating the incident as closed forever. A repeat listing means the cause was not fully removed, a sender source is still dirty, or a new exposure appeared. Suped helps turn that into a routine workflow by combining authentication monitoring, issue detection, fix steps, alerts, hosted DNS controls, and blocklist visibility in one product.
If the listing already affected a vendor review or internal audit, write the incident note in the same order: IP, DroneBL category, root cause, evidence checked, fix completed, delisting status, and monitoring owner. That is the fastest way to turn a blacklist finding into a closed operational item.
