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.
The data
Inside the file
One record per row, a commented header line first. This is what ipregistry-bogon.csv looks like:
# ip_start,ip_end2804:7209:0:0:0:0:0:0,2804:720b:ffff:ffff:ffff:ffff:ffff:ffff2804:1b59:0:0:0:0:0:0,2804:1b5b:ffff:ffff:ffff:ffff:ffff:ffff2001:df1:b0c4:0:0:0:0:0,2001:df1:b0c7:ffff:ffff:ffff:ffff:ffff2804:120e:0:0:0:0:0:0,2804:120f:ffff:ffff:ffff:ffff:ffff:ffff2407:fc00:0:0:0:0:0:0,2407:fc3f:ffff:ffff: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
- 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.