Blocklist Lookup
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A domain or IP address can end up flagged on a spam blocklist for reasons that have nothing to do with what you're currently doing, a previous owner's history, a compromised account, an unrelated user on a shared network. Whatever the cause, being listed quietly damages email deliverability and, in some cases, access to your site through certain filtered networks.
Moreover, Blocklist Lookup tool checks your IP or domain against the major DNSBLs used across the internet.
Check your IP or domain against dozens of the world's most authoritative DNS-based blackhole lists (DNSBL).
Ensure your mail server IP is not listed on anti-spam lists, which could cause your outgoing emails to bounce or land in junk folders.
Regularly monitor your server's reputation to detect compromised accounts, malware distribution, or unauthorized relaying quickly.
Why this matters before you register a domain
- A domain can be available for registration and still carry a blocklist flag from a previous owner
- Email sent from a listed domain often lands in spam or bounces outright
- Some corporate firewalls block access to listed domains entirely
- Catching a flag before you commit is far easier than fixing it after launch
If you're already listed
Getting delisted means going to the specific blocklist provider (Spamhaus and similar services each run their own), following their remediation process, and submitting a request. There's no universal one-click fix, it has to be done per list.
Considering a domain that's new to you? Run this alongside a WHOIS Lookup so you can see both its history and its current standing before you commit.
FAQS
What is a DNSBL?
A Domain Name System Blackhole List (DNSBL) is a database of IP addresses or domains known to send spam, host malware, or participate in botnets.
Why is my IP listed?
Your IP might be listed if a user on your network sent spam, your server was compromised, or you inherited an IP with a poor previous reputation.
How do I get delisted?
If you are listed, you must visit the specific blocklist provider's website (e.g., Spamhaus), follow their remediation guidelines, and submit a delisting request.
Will being listed affect my website?
Being on a DNSBL primarily affects email deliverability. However, some security firewalls and web filters may block access to blacklisted websites as well.