The Bogon dataset enumerates IP ranges that must not appear as source addresses on the public Internet: private and reserved blocks, special-purpose allocations and space not yet assigned by the registries.
Traffic from bogon space is by definition spoofed or misconfigured, which makes this list a cheap, high-precision filter for firewalls, routers and log pipelines.
Available formats
| Format | Description | Size |
|---|---|---|
| CSV | Plain text, one range per line. Import into any database or data warehouse. | 9.9 MB |
| CSV (zipped) | Same file compressed for faster downloads and cheaper storage. | 808 KB |
| MMDB | Binary format for instant lookups with standard MMDB readers. | 1.6 MB |
Latest build: 159,194 records. Files are regenerated every day and published with MD5, SHA-1, SHA-256 and SHA-512 checksums so you can verify every download.
What's inside
The CSV file starts with a header line and contains one record per row, with the following fields:
| Column | Description |
|---|---|
ip_end | Last IP address of the range, inclusive. |
ip_start | First IP address of the range, IPv4 or IPv6. |
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.
What you can build
- Drop spoofed packets at firewalls and load balancers
- Filter bogon announcements from BGP feeds
- Flag impossible client addresses in application logs
- Harden DDoS defenses by discarding unroutable sources early
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.