Is My IP Blacklisted, or My Domain? (The Difference)
If you're trying to figure out whether your IP is blacklisted or your domain is, the short answer is: they're two different problems with two different fixes. An IP blacklist usually means your emails aren't being delivered. A domain or website blocklist means browsers and security tools are warning visitors away from your site.
TL;DR: "Check if my IP is blacklisted" almost always points to an email-delivery problem — your mail server's IP landed on a spam blocklist (an RBL). A domain or website blocklist is different: Google Safe Browsing, which protects billions of devices (Google), or an antivirus engine has flagged your site so browsers warn visitors. Same word, "blacklist," but separate systems and separate fixes.
People mix these up constantly, and it's an easy mistake to make. Both get called a "blacklist," both feel alarming, and both can hurt your business. But an IP problem and a domain problem live in completely different places, get checked by different tools, and get cleared in different ways. This guide untangles the two so you stop chasing the wrong fix — and aims you at the right one.
Is my IP blacklisted, or is it my domain?
It's your IP if your emails are bouncing or landing in spam; it's your domain if browsers show warnings or your site disappears from search. IP blacklists (called RBLs) track mail-server reputation. Domain and website blocklists, like Google Safe Browsing, track whether your site looks dangerous. The symptom tells you which one you're dealing with.
Here's the quickest way to tell them apart. Ask yourself one question: what stopped working?
- Email stopped landing. Messages bounce back, go to spam, or get rejected with a code mentioning a blocklist. That's almost certainly an IP problem — your sending server's reputation.
- Visitors see a warning, or the site vanished from Google. A red "deceptive site ahead" screen, a "this site may be hacked" label in search, or an antivirus block. That's a domain or website problem.
The confusion is baked into the word itself. "Blacklist" got borrowed by two unrelated security communities — email anti-spam and web-safety — decades apart. So when you Google "am I blacklisted," you get a pile of email tools answering a website question, or the reverse. The trick is to stop searching the word and start searching the symptom.
If your problem is the website kind, you can check your domain against the major security blocklists for free in a few seconds. If it's the email kind, you'll want a different category of tool entirely — more on that below.
What is an IP blacklist (and why it's about email)?
An IP blacklist, properly called a DNSBL or RBL (Real-time Blackhole List), is a database of IP addresses known for sending spam or abuse. Mail servers check incoming messages against these lists and reject or filter anything from a listed IP. Spamhaus, one of the largest, reports that its data helps protect billions of mailboxes worldwide (Spamhaus).
The key thing to understand: an RBL listing is about the server that sends your mail, not your website. Even if your site is perfectly clean and fast, your sending IP can get listed because of how email left it.
What gets an IP listed?
Most listings trace back to a handful of causes, and many aren't your fault:
- A compromised account or device on your network sending spam without you knowing.
- A shared hosting IP where another customer on the same server spammed and dragged the whole IP down.
- Misconfigured mail settings — missing SPF, DKIM, or DMARC records that make legitimate mail look forged.
- Sudden volume spikes, like a big newsletter blast from a "cold" IP with no sending history.
In our experience running unflag, plenty of owners arrive in full "blacklist" panic only to discover they're on a mail RBL, not a website list. When we scan their domain across our catalog of security vendors, it comes back clean — the site loads fine, but their order confirmations and password resets stopped arriving. That's a mail-source problem, and the fix has nothing to do with website cleanup. We don't touch RBLs at all, so those folks need a different tool entirely.
How do I check if my IP is blacklisted?
You check an IP against RBLs using a dedicated mail-blacklist lookup, not a website scanner. Tools like MXToolbox or Spamhaus's own lookup let you paste your sending IP and see which RBLs list it. You'll need the actual IP your mail leaves from — often your host's or email provider's, not your home connection.
Once you know which RBLs flagged you, most have a delisting request form on their own site. You typically fix the root cause first — secure the account, fix your SPF/DKIM/DMARC, stop the spam source — then submit the delisting request. Like website blocklists, the RBL operator decides; there's no guaranteed instant removal.
What is a domain or website blocklist (and why it's about safety)?
A website blocklist flags your domain or URL as dangerous to visit, so browsers and security software warn people away. The biggest is Google Safe Browsing, which powers warnings across Chrome, Safari, Firefox, Android, and Gmail — protecting billions of devices (Google). Antivirus engines and threat-intel vendors keep their own separate lists too.
Unlike an email RBL, this is about what's on or served by your site — malware, injected phishing pages, deceptive content, or harmful downloads. A single flag here can hide your homepage behind a full-page red warning, and a large share of visitors turn back the moment they see one.
What triggers a website blocklist?
The usual culprits, in plain terms:
- A hack you can't see — attackers inject hidden phishing pages or redirect scripts, often through an outdated plugin. WordPress sites are the most common targets simply because WordPress runs a huge share of the web (W3Techs).
- Real malware served from the site, sometimes through a compromised ad or third-party script.
- Deceptive content — fake login forms or misleading buttons that trip social-engineering rules (Google Search Central).
- A false positive — a clean site caught by an overcautious automated guess, common with brand-new domains.
One important scope note: website blocklists flag URLs and domains, not standalone files. If an antivirus tool flagged a downloaded program or an EXE you distribute, that's a file-detection issue and a separate process — not the same thing as your website being blocklisted.
How do I check if my domain is blacklisted?
You check a domain using a website-blocklist scanner that queries the security vendors directly. Paste your domain — not an IP — and it reports who's flagging the site. Our free blacklist checker scans your domain across the major security vendors at once, and the walkthrough on how to check if your domain is blacklisted explains how to read the results.
In our experience running unflag, the pattern is consistent: when a website is flagged, it's rarely just one vendor. We scan each domain across our maintained catalog of 124 active security vendors — antivirus engines, web blocklists, and a handful of search-engine and RBL sources — and flagged sites usually show up on several lists at once, because many vendors share threat signals. That's why fixing the website kind of blocklist means dealing with multiple vendors, not one. It's also why, after payment, we generate a unique removal request for each flagging vendor rather than a single template.
How are the fixes different for each?
The fixes share one principle — fix the root cause, then request removal — but the steps, tools, and reviewers are entirely separate. An IP delisting goes through RBL operators and is about mail-server hygiene. A website delisting goes through security vendors like Google Safe Browsing, whose review is manual and done in Search Console, and is about cleaning the site itself.
Here's the practical split:
| If it's your... | The problem is | You fix it by |
|---|---|---|
| IP | Email reputation (RBL listing) | Securing the mail source, fixing SPF/DKIM/DMARC, then requesting RBL delisting |
| Domain / website | Site safety (Safe Browsing, AV) | Cleaning the site, then requesting review with each flagging vendor |
For the website side specifically, the order matters and there are no shortcuts. You clean the site first — remove injected content, close the security hole, update everything. Only then do you request a review. Asking for a review while malware is still present just gets you re-flagged when the vendor re-scans.
Google's part is manual and lives in Search Console: you confirm the fix in the Security Issues report and submit a review request. There's no API, no instant button, and no service can automate it or guarantee a delisting — the vendor re-crawls on its own schedule and makes the call. What you can control is submitting a clean, accurate request to every vendor that flagged you.
This is exactly where the two worlds diverge most. One mail RBL listing is usually one form on one site. A website flag is often several vendors at once, each with its own review process. That fan-out is why website delisting feels so much more tangled than email delisting — it's not harder, there's just more of it. In our experience running unflag, the real work isn't any single vendor; it's covering every flagging vendor in the right way. Some accept a removal email, others (like AVG or ESET) only take a web form, and Google Safe Browsing is a manual Search Console review — so they can't all be handled the same way.
If your site is clean and you're facing a stack of separate vendor reviews, you can have unflagdomain email every flagging vendor a removal request for one €39 payment, with your address as the reply-to so responses come straight to you. To be clear about scope: we don't scan or clean your site, and we don't touch email RBLs — you handle the cleanup, we handle reaching every website vendor that flagged you.
Quick recap: which one is it?
If email is the symptom, start with an IP/RBL lookup; if the website is the symptom, start with a domain blocklist scan. Roughly half the "am I blacklisted?" confusion we see comes down to checking the wrong system first. Match the tool to the symptom and you'll find the real problem far faster than searching the word "blacklist" alone.
A two-line gut check before you do anything else:
- Emails bouncing or in spam? → IP problem. Use a mail-blacklist (RBL) lookup.
- Browser warnings or missing from search? → Domain problem. Use a website blocklist checker.
Both are fixable, and neither means your business is over. The mistake that costs the most time isn't the listing itself — it's spending a week fixing email reputation when your real issue was a hacked WordPress plugin, or scrubbing a clean website when your mail server was the thing that got listed. Identify which one first; everything else follows from there.
Use a dedicated mail-blacklist (RBL) lookup like MXToolbox or Spamhaus's own tool, not a website scanner. Paste your sending IP — usually your host's or email provider's, not your home connection. The tool shows which RBLs list it, and most have their own delisting request form once you've fixed the cause.
No. An IP blacklist (RBL) is about your mail server's reputation and affects email delivery — bounces and spam folders. A domain or website blocklist, like Google Safe Browsing, flags your site as dangerous so browsers warn visitors. Same word, two unrelated systems with separate tools and separate fixes.
That's a classic IP-blacklist symptom, not a website problem. Your sending server's IP likely landed on an RBL — from a compromised account, a shared hosting neighbor, or missing SPF, DKIM, and DMARC records. Fix the mail configuration and root cause, then request delisting from the RBLs that flagged you.
Use a website-blocklist scanner that queries security vendors directly, and paste your domain rather than an IP. Our free blacklist checker scans your domain across the major vendors at once and shows exactly who's flagging it. That tells you how many separate reviews you'll need to clear the site.
No. unflagdomain handles website blocklists only, not email IP/RBL listings, and it doesn't scan or clean your site. Google's Safe Browsing review is manual in Search Console and can't be automated. Once your site is clean, unflagdomain emails every flagging website vendor a removal request — but vendors decide, and no delisting is guaranteed.