The Anycast dataset lists IP ranges announced simultaneously from multiple points around the world, the routing technique behind public DNS resolvers, content delivery networks and DDoS mitigation platforms that steer every user to the nearest site.
An anycast address has no single physical location, so knowing a range is anycast is essential context for interpreting geolocation results, distance computations and traffic scoring. The list is rebuilt daily from BGP routing observations and network measurements.
The data
Inside the file
One record per row, a commented header line first. This is what ipregistry-anycast.csv looks like:
# ip_start,ip_end156.154.64.192,156.154.64.223172.64.176.0,172.64.176.2552620:127:f00f:100:0:0:0:0,2620:127:f00f:1ff:ffff:ffff:ffff:ffff45.156.139.185,45.156.139.1932402:4c60:102:1000:0:0:0:0,2402:4c60:102:1fff:ffff:ffff:ffff:ffffThe rows above come from the free sample. Every build ships with MD5, SHA-1, SHA-256 and SHA-512 checksums so you can verify downloads.
| Column | Description |
|---|---|
ip_start | First IP address of the range, IPv4 or IPv6. |
ip_end | Last IP address of the range, inclusive. |
The MMDB variant carries the same data in a memory-mapped binary tree, compatible with the standard MMDB reader libraries available for every major programming language.
Downloads
Available formats
| Format | Description | Size |
|---|---|---|
| CSV | Plain text, one range per line. Import into any database or data warehouse. | |
| CSV (zipped) | Same file compressed for faster downloads and cheaper storage. | |
| MMDB | Binary format for instant lookups with standard MMDB readers. |
Use cases
What you can build
- Lower geolocation confidence for ranges that resolve to many places at once
- Recognize public DNS resolvers and CDN edges in logs and analytics
- Avoid false impossible-travel and distance signals in fraud scoring
- Explain surprising latency or routing behavior when debugging connectivity
Related use case: Cyber security
Datasets are available with an Ipregistry subscription and download from your dashboard, or over a stable URL for automated syncs. Prefer live data? The same intelligence is served by the Ipregistry API.