# Run an RBL check

#### Overview

<p class="callout info">IP Reputation takes time. You, as the owner of an IP address, are responsible for its reputation from the moment the IP is assigned to you. </p>

An <span class="font-semibold" data-streamdown="strong">RBL</span> (Real-time Blocklist / DNS blocklist) check asks public blocklist providers whether your <span class="font-semibold" data-streamdown="strong">public IPv4</span> is listed. Many mail systems use these lists to decide whether to accept mail. The check in the NOC is a <span class="font-semibold" data-streamdown="strong">quick, on-demand</span> snapshot — useful when you are troubleshooting delivery or confirming reputation after a cleanup.

It is <span class="font-semibold" data-streamdown="strong">not</span> a full mail-audit or a guarantee that every recipient will accept your mail. Large providers also use their own filters, spam scores, and authentication checks (SPF, DKIM, DMARC, PTR).

#### Where to run it

1. Sign in to the NOC.
2. Open <span class="font-semibold" data-streamdown="strong">IP Address Management</span>.
3. Find the IP (search box, service filter on the left, or <span class="font-semibold" data-streamdown="strong">Ctrl+K</span> quick jump if your browser supports it).

#### Run the check

To run an RBL check on your IP address.

[![NoCRBLCheck.png](https://docs.f2h.cloud/uploads/images/gallery/2026-05/scaled-1680-/nocrblcheck.png)](https://docs.f2h.cloud/uploads/images/gallery/2026-05/nocrblcheck.png)

##### <span class="font-semibold" data-streamdown="strong">From the table (quick action)</span>

Click the <span class="font-semibold" data-streamdown="strong">RBL</span> icon on the row for that address. The UI will request a fresh check for that IP.

##### <span class="font-semibold" data-streamdown="strong">From the expanded row (detail)</span>

Click the row to expand the <span class="font-semibold" data-streamdown="strong">per-IP</span> panel, then use <span class="font-semibold" data-streamdown="strong">Run RBL check</span>. Use this when you already have PTR, unblock, or another context open for the same address.

#### Read the result

- If the address is <span class="font-semibold" data-streamdown="strong">not</span> on the lists we query, you will see a <span class="font-semibold" data-streamdown="strong">clean</span> / <span class="font-semibold" data-streamdown="strong">no listing</span> style result (wording may vary slightly in the UI).
- If it <span class="font-semibold" data-streamdown="strong">is</span> listed, the UI shows <span class="font-semibold" data-streamdown="strong">how many</span> lists reported a hit and may summarize severity.

```
{
  "status": "ok",
  "ip": "51.161.192.72",
  "rbl": {
    "zen.spamhaus.org": "ok",
    "b.barracudacentral.org": "ok",
    "bl.spamcop.net": "ok",
    "psbl.surriel.com": "ok",
    "dnsbl.sorbs.net": "ok",
    "spam.dnsbl.sorbs.net": "ok",
    "all.s5h.net": "ok",
    "ix.dnsbl.manitu.net": "ok",
    "cbl.abuseat.org": "policy"
  },
  "detail": {
    "cbl.abuseat.org": "127.255.255.254 (Error: open resolver; https://check.spamhaus.org/returnc/pub/158.69.169.2/)"
  },
  "summary": {
    "total": 9,
    "listed": 0,
    "errors": 1,
    "policy": 1,
    "clean": 8
  }
}
```

Results update the <span class="font-semibold" data-streamdown="strong">RBL</span> summary chips at the top of the page and badges on rows so you can spot problem IPs at a glance.