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Not checked
Run the checker to review blacklist status.
IP Blacklist Checker
Check whether a public IP appears on spam, abuse, malware, botnet, email, and DNS-based blocklists.
Checks public IPv4 and IPv6 addresses.
A listing may be temporary, outdated, or specific to one abuse category.
Enter a public IP address to check DNS blocklists and reputation lists.
Lists Checked
0
completed blacklist checks
Listed On
0
blacklists reporting the IP
Clear On
0
lists with no match
Timeouts
0
lists not responding
Risk Level
—
combined listing severity
Mail Lists
0
email and spam listings
Threat Lists
0
malware, botnet or abuse
Network
—
ASN or provider
📑 Blacklist Results
Blacklist
Status
Category
Response
🔎 Security Findings
📋 IP & Network Details
IP Address
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IP Version
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Reverse DNS
—
ASN
—
ISP / Organization
—
Country
—
Total Lists Requested
—
Completed Checks
—
Average Response Time
—
Checked At
—
💡 Recommended Actions
🧾 Blacklist Summary
📦 Raw API Result
A blacklist match does not always mean the current user or server is malicious. Shared hosting, carrier networks, recycled IPs, compromised devices, stale data, and previous owners can affect reputation.
HOW IT WORKS
Real DNSBL Queries, Timeouts Never Reported As Clean
This checker queries a configured list of public DNS-based blocklists (DNSBLs) the standard way every mail server and firewall has for over two decades: the IP's octets are reversed and looked up as a hostname under each list's zone (for example, 8.8.4.4 against a zone becomes 4.4.8.8.zone). A DNS answer starting with 127.x.x.x means that list has flagged the address; no such record (NXDOMAIN) means it hasn't. Every list has its own strict timeout, and a timeout is always reported as its own status - never silently counted as "clear," since a list that didn't answer told us nothing either way. Each list's name, zone, category and official delisting link are configured on the server and reviewed for their current usage terms - some DNSBL operators restrict or prohibit high-volume automated querying, which this tool respects with per-list and overall query budgets and result caching.
IP Blacklist Checker FAQ
Does a blacklist listing mean the IP is definitely malicious?
Not necessarily. Shared hosting ranges, mobile carrier NAT pools, recycled IPs, and stale or outdated entries can all cause a listing without current malicious activity - use it as one signal among several.
Why does one list show "Timeout" instead of "Clear"?
A timeout means that list's DNS server didn't answer in time - it's genuinely unknown, not a clean result, so this tool never reports it as "Clear."
Can this check every blacklist that exists?
No single tool queries every DNSBL - this checker queries a curated, server-configured set of well-known lists whose usage terms permit this kind of lookup.
How do I get delisted?
Use the delisting link shown next to a "Listed" result - it goes directly to that specific provider's official removal process, never a third-party or generic link.
Can I check a private or internal IP address?
No. Addresses in private, loopback, link-local or reserved ranges are rejected before any lookup happens.