Look up any IP or domain right now and get the answer.
On-demand blacklist lookup for a single IP or domain. You type the address, you get back the listing status across every major blocklist with a 0-100 health score. Built for one-off verification, not background monitoring.
Lambda Group
Direct lookup, immediate answer.
You do not need to add the IP or domain to SendKit first. Run lookups on assets you are evaluating, vetting, or troubleshooting.
Concurrent queries across every major list return results in seconds rather than minutes of sequential waiting.
See exactly which lists flagged the asset, so you know which delisting workflow applies.
No per-query fees, no monthly caps, no API plan to negotiate.
Sometimes you need to know about a specific IP, right now.
Paste any IPv4 address or domain into the lookup box. You do not need to have it connected to your SendKit account first.
The tool fans out the query across every major email blocklist concurrently. Results come back within seconds, not the minutes a sequential check would take.
You get a single 0-100 health score for quick decisions, plus the per-blocklist breakdown if you need to know which specific list flagged the asset and what delisting steps apply.
Inherited domains carry inherited listings. Run the lookup before purchase to avoid paying for a domain that already needs delisting work.
When a single campaign's open rates crater, the lookup tells you within seconds whether the cause is a fresh listing on the sending IP.
After requesting removal from a blocklist, run the lookup a few hours later to confirm the delisting completed before you resume campaigns.
A lookup tool, not a monitoring service.
Free standalone lookup vs metered API plans
Most blacklist lookup services price per query or behind API plans. SendKit's in-dashboard lookup tool is free and unmetered for SendKit customers, so the tool stops feeling expensive to use and starts being something you actually run.
When to reach for the lookup vs the monitoring service
The lookup tool is for verifying one specific asset on demand: a domain you are about to buy, an IP a colleague mentioned, a sending address you suspect is the cause of a problem. The continuous monitoring service handles the ongoing surveillance work for assets already in your account. Different tools, different jobs, and most teams end up using both at different moments.
Per-blocklist visibility, not just a score
The 0-100 score is the quick answer. The per-blocklist breakdown is the actionable answer. Knowing which specific list flagged you determines the delisting workflow, since each major blocklist has its own removal process. The lookup surfaces that detail rather than abstracting it away.
Got questions? We've got answers.
No. The lookup tool accepts any IP address or domain, including ones not in your SendKit account. This is what makes it useful for vetting domains before purchase or checking assets you do not own.
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