DNS blocklist snapshot
Check a sending domain against DNS blocklists.
Enter the sending domain you want to check. The tool queries configured DNS blocklists and shows which providers report a listing, return a clean result, or are unavailable. This is a point-in-time lookup; it does not cover every blocklist or establish inbox placement. No signup is required.
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Blacklist lookup — frequently asked questions
Pair this lookup with the guide
Want the bigger picture on sender reputation?
A per-hit severity reading is one slice of the reputation composite. The full reputation guide explains how this breakdown composes with Gmail Postmaster Tools domain + IP reputation, Microsoft SNDS per-IP filter colour, complaint rate, and the major DNSBLs to produce the actual placement a given inbox delivers.
Read the sender reputation guide →Pair this lookup with the pillar
Want the per-provider scoring behind these findings?
Per-list severity is one slice of the reputation composite. The Email Reputation pillar walks through how each provider — Gmail Postmaster Tools, Microsoft SNDS, SenderScore, and Cisco Talos — scores the same domain on the same days, so a row that is severe here can be read against the per-provider verdict before you commit to a delist request.
Read the Email Reputation pillar →Pair this lookup with the tool
Want the per-list delist workflow for each finding?
The depth view of /tools/blocklist-check shows the upstream response host per list, the delist URL for every list that currently flags the target, and the per-list history. Treat this lookup as the triage step — once a row comes back severe, jump to the depth view for the delist workflow.
For a simpler domain or IP status matrix without the per-hit AI severity view, check your domain against blocklists and scan the clean, listed, or unavailable result for every configured list.
Open the per-list blocklist-check →