Blacklist Checker

Blacklist Checker: Scan Your Domain, Email, or IP Address

Keep your online presence clean and trusted. Our Blacklist Checker uses up-to-date data to check whether your IP address, domain, or email appears in major blocklist databases. It helps you spot suspicious activity early and take quick steps to protect your website, email deliverability, and overall sender reputation.

What is a blacklist (DNSBL) and why does it matter?

A blacklist — also called a DNSBL (DNS-based blocklist) or RBL (real-time blocklist) — is a database of IPs and domains that have been flagged for sending spam, hosting malware, or other abusive behavior. Mail servers and security systems query these lists before accepting a message or connection. If your IP or domain is listed, your emails can be sent to spam or rejected outright, and some browsers or filters may warn visitors away from your site. Getting listed can quietly wreck deliverability, so regular checks are worthwhile.

How do I use the Blacklist Checker?

Enter your details

Type one item per scan: an IP address, a domain name, or an email address. Checking one at a time keeps results accurate and clear.

Start the scan

Click "Check in Blacklists". The tool searches relevant databases and, where needed, shows the related IP so you can continue and view the full report.

Review the results

You'll see a list of blacklist databases with a simple status: Yes means the IP, domain, or email is listed, and No means it is not. Click "Details" on any flag to learn the likely reason and what it affects.

Note: NasSeoTools does not operate or control any blacklist databases. This tool only checks your IP, domain, or email against third-party blacklists and shows the results in one place. We don't promote any specific blacklist and do not support pay-to-remove services.

What does each check cover?

IP blacklist check

Is your server slow, blocked, or unreliable? An IP blacklist scan shows whether your IP is listed in spam or security databases, so you can fix issues before they spread.

Email blacklist check

Are emails landing in spam or not arriving at all? The email blacklist check tests your address against multiple blacklists to help you improve deliverability and protect your sender reputation.

Domain blacklist check

The domain blacklist scan confirms your domain hasn't been flagged for malware, phishing, or suspicious behavior — regular checks reduce risk and maintain trust.

How do email delivery and spam filters work?

Email filtering follows a simple flow:

• You send an email from your address to a recipient.
• The recipient's mail server identifies the sending IP address and maps it to the related domain.
• It checks that IP and domain against blacklist databases that track known spam and suspicious sources.
• If listed, the message is often treated as risky and moved to Spam/Junk or limited.
• If the sender is a repeat offender, providers may block the email entirely, so it never reaches the inbox or even the spam folder.

Why did my IP or domain get blacklisted?

Common causes include a compromised account or device sending spam, a misconfigured mail server (missing SPF, DKIM, or DMARC), sharing a server IP with a spammer, sending to old or purchased email lists, or a hacked website distributing malware. Sometimes a previous owner of your IP address caused the listing before it was assigned to you.

How do I get removed from a blacklist?

First, fix the underlying cause — secure the account, clean any malware, and set up proper email authentication — otherwise you'll be relisted. Then visit the specific blacklist's website and follow its delisting process; most reputable lists offer a free removal request. Avoid services that charge to remove you. Recheck after a day or two, since delisting and propagation take time.

How can I avoid getting blacklisted?

• Set up SPF, DKIM, and DMARC records so receivers can verify your mail.
• Only email people who opted in, and remove bounces and inactive addresses.
• Keep your website and CMS updated to prevent malware infections.
• Use a reputable host and monitor your IP/domain reputation regularly.

Frequently asked questions

How often should I check my blacklist status?

Monthly is reasonable for most sites; check immediately if you notice deliverability problems or a traffic drop.

Will being on one blacklist block all my email?

Not necessarily — impact depends on which list and which receivers use it. Major lists carry more weight than obscure ones.

How long does delisting take?

Once you submit a valid removal request and fix the cause, it typically takes a few hours to a couple of days.

Can a shared hosting IP get me listed unfairly?

Yes. If another site on your shared IP sends spam, the IP can be listed. A dedicated IP reduces this risk.

Related tools

• Find DNS Record — check your SPF, DKIM, and DMARC TXT records.
• What Is My IP — confirm the IP you're sending from.
• Domain to IP — resolve your domain's IP before checking it.
• Website SEO Score Checker — review your site's security signals.