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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 A listing may be temporary, outdated, or specific to one abuse category.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.

0

Not checked

Run the checker to review blacklist status.

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

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ASN

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ISP / Organization

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Country

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Total Lists Requested

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Completed Checks

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Average Response Time

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Checked At

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💡 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.

What else can you check?

These tools all work on the same connection and address data — pick whichever question you actually have.

Want to see the full path to a site? DNS, redirects, every hop, the CDN, TLS and the origin server. Want to know your public IP? See your IPv4 and IPv6 addresses, location, ISP and ASN. Want to check your tower & route? Live ping, speed, DNS, traceroute and a map of nearby points. Want to ping from around the world? Real latency from real probes across 12 countries, live on a map. Want to locate any IP address? City, region, country and coordinates for any public IP. Want to know if an IP is risky? Proxy, VPN, Tor, hosting and abuse-report indicators. Want to know who owns an IP? Network owner, ASN, CIDR range and abuse contact. Want to explore an AS number? Announced prefixes, BGP neighbours and registry details. Want to test your connection speed? Measure real download, upload, ping and jitter. Want to see what changed? Word-level diff between two blocks of text or code. Want to know if a DNS change is live yet? Compare answers from five independent public resolvers. Want to verify a domain's nameservers? Direct authoritative checks, glue records and SOA serials. Want to check a domain's DNSSEC setup? DNSKEY, DS records, signature expiry and real validation. Want to see the hop-by-hop path to a server? A real traceroute from a genuine probe anywhere in the world. Want to know if a server port is open? A real TCP connection attempt - open, closed or filtered. Want to measure latency to a server? Real connect timing - min/avg/max, jitter and connection loss. Want a clean URL slug from a title? Real transliteration, stop words and batch mode. Want to find and replace across a document? Regex, capture groups and a live preview before you commit. Want to find the invisible character? Code points, escapes, bytes and hidden-character detection. Want to escape text for HTML? Minimal, named or numeric entities, attribute-safe. Want to strip emoji cleanly? Whole clusters - no half-flags or stray modifiers left. Want to spot repeated words? Frequency, density and accidental doubles like "the the". Want to know if a URL is cached? Two requests prove whether your CDN is really caching it. Want to see what a site knows about you? Storage, cookies, tokens and what your browser actually cached. Want to run that check on any site? One-click bookmarklet reads storage and tokens where they live. Want to know who your site talks to? Renders the page and names every outside company it contacts. Is your site one address or four? www, non-www, http and https - which serve, which redirect. Need to build an Authorization header? Basic, Bearer, API key, Digest and AWS SigV4 - signed in your browser. Want to tidy up a messy SQL query? Beautify, minify, lint and convert keyword casing for six dialects. Need to work out a percentage? Nine calculators covering every way a percentage gets asked. Want to work out a rise or a raise? Increases, growth, compounding and CAGR, with the working shown. Want to work out a discount or a drop? Discounts, stacked sales and depreciation, with the working shown. What is actually on that page? Words, reading time, readability, every image, embed and link. Need a favicon that works everywhere? Every size, a real multi-resolution .ico, and the tags to paste. What headers does a site send back? Every response header on every redirect hop, explained. Need to test a regular expression? Live matches, capture groups, replace preview and code snippets. Need a JPG as a PNG? Batch convert in your browser, with optional transparent background. Need somewhere to jot things down? Private notes, links, to-dos and reminders saved in your browser. Need just some pages of a PDF? Split by page, range or chunk, or extract the pages you pick. What is hiding inside that image? EXIF camera settings, GPS tags, colour palette and web checks.

COMMON QUESTIONS

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.