Get top ASes by announced IP space

GET/radar/bgp/ips/top/ases

Returns the top-N autonomous systems by announced IP space at the nearest 8-hour RIB boundary at or before the requested date. The snapped boundary is returned as anchor_ts.

Security

API Token

The preferred authorization scheme for interacting with the Cloudflare API. Create a token.

Example:Authorization: Bearer Sn3lZJTBX6kkg7OdcBUAxOO963GEIyGQqnFTOFYY

API Email + API Key

The previous authorization scheme for interacting with the Cloudflare API, used in conjunction with a Global API key.

Example:X-Auth-Email: user@example.com

The previous authorization scheme for interacting with the Cloudflare API. When possible, use API tokens instead of Global API keys.

Example:X-Auth-Key: 144c9defac04969c7bfad8efaa8ea194

Accepted Permissions (at least one required)

User Details WriteUser Details Read

Query ParametersExpand Collapse

country: optional string

Optional ISO 3166-1 alpha-2 country filter. Omit for global top-N.

maxLength2

minLength2

date: optional string

Filters results by the specified datetime (ISO 8601).

formatdate-time

format: optional "JSON" or "CSV"

Format in which results will be returned.

One of the following:

"JSON"

"CSV"

limit: optional number

Limits the number of objects returned in the response.

maximum50

minimum1

metric: optional "v4_24s" or "v6_48s"

Ranking metric: IPv4 /24 count or IPv6 /48 count.

One of the following:

"v4_24s"

"v6_48s"

ReturnsExpand Collapse

result: object { anchorTs, asns, country, metric }

anchorTs: string

formatdate-time

asns: array of object { asn, v4_24s, v6_48s }

asn: number

v4_24s: number

v6_48s: number

country: string

metric: string

success: boolean

Get top ASes by announced IP space

curl https://api.cloudflare.com/client/v4/radar/bgp/ips/top/ases \
    -H "Authorization: Bearer $CLOUDFLARE_API_TOKEN"

{
  "result": {
    "anchorTs": "2026-04-18T16:00:00.000Z",
    "asns": [
      {
        "asn": 749,
        "v4_24s": 875649,
        "v6_48s": 0
      }
    ],
    "country": "US",
    "metric": "v4_24s"
  },
  "success": true
}

Returns Examples

{
  "result": {
    "anchorTs": "2026-04-18T16:00:00.000Z",
    "asns": [
      {
        "asn": 749,
        "v4_24s": 875649,
        "v6_48s": 0
      }
    ],
    "country": "US",
    "metric": "v4_24s"
  },
  "success": true
}