How-To

How to check if your domain or IP is blacklisted (and what to do)

Inboxlogy5 min readUpdated 2026-10-26

In short: To check for a blacklisting, enter your sending IP or domain into a free Blacklist Checker. It queries major DNSBLs and shows which list you, if any. If you are listed, fix the cause first, then request delisting on each operator's site. Checking regularly catches reputation problems before they sink a campaign.

On this page

  1. Find your sending IP first
  2. How to check step by step
  3. What to do if you're listed
  4. Prevent future listings

Find your sending IP first

Blacklists often list IPs, so you need the IP your mail actually sends from. You can find it in a sent message's header (the originating Received line) or from your sending tool's settings. If you send through a provider on shared IPs, check both your domain and, where possible, the shared IP.

How to check step by step

  1. Open the Blacklist Checker. Go to the free Inboxlogy Blacklist Checker.
  2. Enter your IP or domain. Paste the sending IP or your domain.
  3. Click Check. The tool queries major DNSBLs in parallel.
  4. Read the results. Each list shows listed or clean. A few may time out; treat those as inconclusive rather than clean.

What to do if you're listed

Do not just request removal. Work in order:

  1. Fix the cause. Stop sending to unverified lists, pause an aggressive ramp, clean bounces, reduce complaints.
  2. Wait briefly. Some lists auto-expire once bad behaviour stops.
  3. Request delisting. Use the form on the specific blacklist's website.
  4. Re-check. Confirm the listing cleared before resuming full volume.

Prevent future listings

Most listings are preventable: verify addresses before sending, warm up new domains gradually with a warm-up ramp, keep authentication clean (SPF, DKIM, DMARC), and monitor your status on a schedule rather than only after problems appear.

Check for blacklistings now

Enter your IP or domain and see which major blocklists flag you, in seconds.

Open the Blacklist Checker →All free tools

Frequently asked questions

How often should I check my blacklist status?
For active cold email, check weekly or before each new campaign. Regular checks catch reputation problems early, before they quietly cut your delivery.
What if a blacklist check times out?
Some public DNSBLs rate-limit queries, so a check can time out. Treat that as inconclusive and re-check later, rather than assuming you are clean.
Can I check a shared IP I don't control?
You can check any IP, but you cannot delist one you do not control. If your provider's shared IP is listed, contact them; dedicated infrastructure avoids this problem.
Is the Blacklist Checker free?
Yes. It queries public blocklists from your browser at no cost and without an account.

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