# [ip-location-db](https://github.com/sapics/ip-location-db)/asn-mmdb
## Download
| Database | Type | License | Updated | IPv4 | IPv6 | IPv4+IPV6 | IPv4-num | IPv6-num |
|---|---|---|---|---|---|---|---|---|
| [RouteViews + ASN + DB-IP](https://github.com/sapics/ip-location-db/tree/main/asn/)
[](https://www.npmjs.com/package/@ip-location-db/asn)
[](https://www.npmjs.com/package/@ip-location-db/asn-mmdb) | ASN | [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) by [RouteViews](https://www.routeviews.org/routeviews/) and [DB-IP](https://db-ip.com/) | Daily | [CSV](https://cdn.jsdelivr.net/npm/@ip-location-db/asn/asn-ipv4.csv)
[MMDB](https://cdn.jsdelivr.net/npm/@ip-location-db/asn-mmdb/asn-ipv4.mmdb) | [CSV](https://cdn.jsdelivr.net/npm/@ip-location-db/asn/asn-ipv6.csv)
[MMDB](https://cdn.jsdelivr.net/npm/@ip-location-db/asn-mmdb/asn-ipv6.mmdb) | [MMDB](https://cdn.jsdelivr.net/npm/@ip-location-db/asn-mmdb/asn.mmdb) | [CSV](https://cdn.jsdelivr.net/npm/@ip-location-db/asn/asn-ipv4-num.csv) | [CSV](https://cdn.jsdelivr.net/npm/@ip-location-db/asn/asn-ipv6-num.csv) |
## MMDB Format
```
autonomous_system_number, autonomous_system_organization
```
### autonomous_system_number
`autonomous_system_number` is a unique number assigned to an Autonomous System (AS) by the [IANA](https://www.iana.org/). [wiki](https://wikipedia.org/wiki/Autonomous_system_(Internet)).
## Referenced Database and License
### [RouteViews](https://www.routeviews.org/routeviews/) database [Update: every 2 hours]
We are using this database to get AS number from ipv4 address for [asn](https://www.npmjs.com/package/@ip-location-db/asn).
This is licensed under a [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/), so, **you must create attribution to [RouteViews](https://www.routeviews.org/routeviews/) for using asn database**.
### ASN database [Update: Daily]
Created by merging 5 RIP ([afrinic](https://afrinic.net), [apnic](https://www.apnic.net), [arin](https://www.arin.net), [lacnic](https://www.lacnic.net), [ripe ncc](https://www.ripe.net)) IP-ASN-Country database.
[ASN (Autonomous System Number)](https://wikipedia.org/wiki/Autonomous_system_(Internet)) is a unique number assigned to an Autonomous System (AS) by the [IANA](https://www.iana.org/).
### [DB-IP](https://db-ip.com/) database [Update: Monthly]
You could download and read the license from [ip-to-asn-lite](https://db-ip.com/db/download/ip-to-asn-lite) or [ip-to-country-lite](https://db-ip.com/db/download/ip-to-country-lite) or [ip-to-city-lite](https://db-ip.com/db/download/ip-to-city-lite).
Most of the AS Organization name used in [asn](https://www.npmjs.com/package/@ip-location-db/asn) uses [ip-to-asn-lite](https://db-ip.com/db/download/ip-to-asn-lite) database.
We also use [ip-to-asn-lite](https://db-ip.com/db/download/ip-to-asn-lite) to get AS Number from ip address as a supplemental.
These database are licensed under a [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/), so, **you must create attribution to [DB-IP.com](https://db-ip.com/) for using DB-IP database**.
In the case of a web application, you must include a link back to DB-IP.com on pages that display or use results from the database. You may do it by pasting the HTML code snippet into your code: `IP Geolocation by DB-IP`.
If you need better accuracy or no attribution or daily updates, please use the [Commercial Version of db-ip](https://db-ip.com/db/ip-to-country).
## Merge rule for multiple database
When merging multiple database, set the front database above back one.
For example, geo-whois-asn-country is created by merging 3 database with GeoFeed > Whois > ASN.
In more detail, the geo-whois-asn database matches the GeoFeed results, for ip ranges not covered by GeoFeed it matches the Whois results, and for ip ranges not covered by either it matches the ASN results.
```
GeoFeed: 1.0.0.0, 2.0.0.0, AU
3.0.0.1, 4.0.0.0, US
Whois: 1.0.0.0, 2.2.0.0, FR
2.5.0.1, 4.0.0.0, IN
ASN: 1.0.0.0, 4.0.0.0, JP
```
is converted to
```
GeoFeed-Whois-ASN: 1.0.0.0, 2.0.0.0, AU
2.0.0.1, 2.2.0.0, FR
2.2.0.1, 2.5.0.0, JP
2.5.0.1, 3.0.0.0, IN
3.0.0.1, 4.0.0.0, US
```