---
title: 'ASN Settings'
url: 'https://docs.danami.com/warden/settings/antispam/plugin-settings/asn'
markdown: 'https://docs.danami.com/warden/settings/antispam/plugin-settings/asn.md'
date: '2026-09-22'
description: 'ASN use GeoDB - asn_use_geodb Use the Mail::SpamAssassin::GeoDB module to lookup ASN numbers. Make sure to set the MaxMind license under Settings -> Geolocation Settings so that the Maxmind ASN database can be downloaded. GeoDB can only set _ASN_ tag, it has no data for _ASNCIDR_. If you need bo…'
taxonomy:
  category:
    - docs
  tag:
    - asn
---

[](#)  [ Basics ](https://docs.danami.com/warden/)     [ Settings ](https://docs.danami.com/warden/settings)     [ Antispam ](https://docs.danami.com/warden/settings/antispam)     [ Plugin Settings ](https://docs.danami.com/warden/settings/antispam/plugin-settings)      ASN Settings    

# ASN Settings

**ASN use GeoDB** - `asn_use_geodb`
Use the Mail::SpamAssassin::GeoDB module to lookup ASN numbers. Make sure to set the MaxMind license under Settings -> Geolocation Settings so that the Maxmind ASN database can be downloaded. GeoDB can only set `_ASN_` tag, it has no data for `_ASNCIDR_`. If you need both, then set asn\_prefer\_geodb 0 so DNS rules are tried.
Default: 1

**ASN prefer GeoDB** - `asn_prefer_geodb`
If set, DNS lookups (asn\_lookup rules) will not be run if GeoDB successfully finds ASN. Set this to 0 to get `_ASNCIDR_` even if GeoDB finds `_ASN_`.
Default: 1

**ASN use DNS** - `asn_use_dns`
Set to 0 to never allow DNS queries.
Default: 1

**ASN prefix** - `asn_prefix`
The string specified in the argument is prepended to each ASN when storing it as a tag.
Default: AS

**ASN lookup** - `asn_lookup`
Lookup the ASN info in the specified zone for the first external IP address and add the AS number to the first specified tag and routing info to the second specified tag.
Default: empty

**ASN lookup IPv6** - `asn_lookup_ipv6`
Use specified zone for lookups of IPv6 addresses. If zone supports both IPv4 and IPv6 queries, use both `asn_lookup` and `asn_lookup_ipv6` for the same zone.
Default: empty

**Clear ASN lookups** - `clear_asn_lookups`
Removes any previously declared asn\_lookup entries from a list of queries.
Default: empty

**Bad ASNs** - `asn_bad_asns`
If an email is relayed though any of these ASNs then apply the `ASN_BAD` score to them.
Default: empty

**Bad ASN score** - `asn_bad_score`
The score to give any ASN matching the bad ASNs.
Default: 3.25

**Good ASNs** - `asn_good_asns`
If an email is relayed though any of these ASNs then apply the `ASN_GOOD` score to them.
Default: empty

**Good ASN score** - `asn_good_score`
The score to give any ASN matching the good ASNs.
Default: -0.5

## Related Pages

- [ASN](https://docs.danami.com/warden/user-guide/antispam-plugins/asn "ASN")

 [ ](https://docs.danami.com/warden/command-line-interface/antispam/antispam-plugin-asn)

---

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