“We noticed you may be using an ad blocker. SEO Site Checker relies on ads to keep our SEO tools free. Please consider disabling your ad blocker to support us - thank you!”“We noticed you may be using an ad blocker. SEO Site Checker relies on ads to keep our SEO tools free. Please consider disabling your ad blocker to support us - thank you!”
Enter an IPv4 address or a domain and see, in seconds, which of 33 DNS blacklists list it. Free, with no account.
What Is a Blacklist Checker?
Quick answer: This blacklist checker asks DNS blacklists (DNSBLs) whether an IPv4 address is flagged for spam or abuse. This free blacklist check queries 33 lists in a single pass and shows which, if any, flag your IP.
When your sending IP sits on a list that a receiving mail server consults, that server can reject mail or send it to the spam folder. This tool tests one IPv4 address per run.
How to Check an IP or Domain Against Blacklists
A fresh address took about 3 seconds in our tests,; the first check after a quiet spell can take longer.
Enter it. Type an IPv4 address, a domain or a URL.
Press Check Blacklist. The card names the address tested.
Wait a few seconds.
Read the summary. A red banner reads, for example, Listed on 2 of 33 blacklists checked. Green means none of the lists that answered flagged it.
Email problems? Check your mail's sending IP, not your website's. What Is My IP shows it. A CDN-fronted domain resolves to a shared edge address, so its result says little.
What the Results Mean: Listed, Not-Listed and Not Checked
Three states, and only two count.
State
What it means
What to do
Listed
Answer inside 127.0.0.0/8. Red, sometimes with a return code such as Spamhaus PBL or XBL.
Find the cause, then request removal.
Not-Listed
No listing answer, normally NXDOMAIN. Green.
Nothing.
Not checked
No usable answer. Grey.
Retry later. It is no verdict.
The summary counts only Listed and Not-Listed rows, so grey never inflates the clean total. A list that times out or fails our daily check shows Not checked, so a good address can read 32 of 33. That is normal.
Which Blacklists We Check and How the Check Works
Our blacklist checker asks 33 DNS blacklists, including Spamhaus ZEN, SpamCop, Barracuda, PSBL, DroneBL, Mailspike and UCEPROTECT levels 1 to 3. Following RFC 5782, we reverse the octets, so 8.8.4.4 becomes 4.4.8.8, and query that name under each list's zone, asking its authoritative name server where possible. A 127.0.0.0/8 answer means listed.
A domain gets an A record lookup and is checked at the first public IPv4 address, not its MX record. A list failing our daily vetting shows Not checked.
What to Do If Your IP Is Listed
Fix the cause first, or a listing can return.
Confirm the IP. It must send your mail.
Find the cause. Suspect a compromised account, malware or an open relay or a noisy neighbor on a shared IP. Our guide to fixing a blacklisted domain helps.
Frequently Asked Questions (FAQs) is a list of common questions and answers provided to quickly address common concerns or inquiries.
What is a blacklist checker and what does it check?
The blacklist checker sends DNS queries for one IPv4 address to 33 spam lists (DNSBL or RBL) and shows which of them list it. A domain is resolved first and checked at its first public IPv4 address.
How do I know if my IP or domain is blacklisted?
Enter it, press Check Blacklist and read the summary. Red means Listed on N of M blacklists checked, and each Listed row names the list. For a domain, note the address the card says was checked.
Does it check the domain itself or the IP address?
The IP address. Blacklists record addresses, so a domain is checked at the first public IPv4 address in its A records, never at its MX servers. For email trouble, enter the sending IP, since that is what receiving servers see.
What does Not checked mean in the results?
That list gave no usable answer: it timed out, returned an error code or failed our daily health check. It says nothing about your address, is never counted as clean and is left out of the summary.
How do I get removed from a blacklist?
Fix whatever caused the listing, then follow the removal process that list publishes, since each sets its own rules. Some listings expire on their own and some need a delisting request. We cannot predict the wait.
Is a clean result a guarantee that my email will be delivered?
No. A clean result is a good sign, nothing more. Email deliverability also depends on sender reputation at each mailbox provider, on SPF, DKIM and DMARC authentication, and on content. This tool cannot see those signals.
We use cookies to personalize content and ads, to provide social media features and to analyze our traffic. You consent to our cookies if you continue to use our website.
Install SEO Site CheckerFree SEO tools - always in your pocket.
