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Regionalized IP Bindings

Regionalized IP Bindings let you regionalize traffic at the IP layer for prefixes you bring to Cloudflare through Bring Your Own IP (BYOIP). You bind a CIDR from one of your prefixes to a region, and Cloudflare processes traffic destined for those IP addresses only within the data centers in that region.

This complements the other ways to use Regional Services: where Regional Hostnames regionalize traffic by hostname, Regionalized IP Bindings regionalize traffic by IP prefix — ideal for address-map deployments and any service you address by IP rather than hostname. Because bindings are managed entirely through the API, you can regionalize broad configurations yourself once your entitlements are enabled, without per-zone setup from your account team.

A prefix binding maps a CIDR (within a BYOIP prefix you own) to a region key (for example, us or eu). After Cloudflare provisions the binding, traffic to addresses in that CIDR terminates TLS and is processed only inside the configured region, following the same in-region processing model described in Regional Services.

Bindings are managed through the Data Localization Suite API under /accounts/{account_id}/dls/.

A binding covers a range of addresses within a prefix, not just a single address — you do not need to create one binding per IP address. The cidr you bind must:

• Fall within the prefix identified by prefix_id.
• Be more specific than the prefix itself — a sub-range within it. For example, within a /24 prefix you can bind any range from a /25 down to a single address (a /32 for IPv4, or a /128 for IPv6). Binding the entire prefix (the full /24) is rejected with a conflict error, because the whole prefix range is already in use once Cloudflare advertises it.

How you choose the CIDR depends on how you want to split the prefix across regions:

• One region for the whole prefix — cover the prefix with sub-ranges that all point to the same region. For example, bind both 203.0.113.0/25 and 203.0.113.128/25 to eu to regionalize every address in a /24.
• Different regions for different addresses — bind each range to the region you want (for example, 203.0.113.0/25 to eu and 203.0.113.128/25 to us). Cloudflare applies the most specific binding that matches a given address, so a narrower binding takes precedence over a broader one that overlaps it.

Each CIDR can have only one binding. If you try to create a second binding for a CIDR that is already bound, the API returns a conflict error. To change the region for an existing binding, update it instead of creating a new one.

Before you create a binding, make sure that:

• Your account has both the Regional Services and Regional Services for BYOIP entitlements enabled. Contact your account team to enable them.
• You have onboarded a BYOIP prefix to Cloudflare and know its prefix ID.
• The region you want to use exists for your account. Refer to List available regions.
• Your API token has the required permissions. Refer to Required API token permissions.

These endpoints are authorized at the account level. The permissions you need depend on the operation:

Write operations require IP Prefixes: Write in addition to DLS: Write because the binding is created against a BYOIP prefix that you own in Addressing — Cloudflare verifies that you have permission to modify that prefix. A token with only DLS: Write can read regions and bindings but will be rejected when it tries to create or change a binding.

The Super Administrator and Administrator roles include all of these permissions. A custom role works as long as it includes the permission groups above.

Each binding references a region by its region_key (for example, us or eu). List the regions available to your account to find a valid key.

curl "https://api.cloudflare.com/client/v4/accounts/%7Baccount_id%7D/dls/regions" \
	--request GET \
	--header "Authorization: Bearer $CLOUDFLARE_API_TOKEN"

{
	"success": true,
	"errors": [],
	"messages": [],
	"result": [
		{
			"id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
			"name": "Europe",
			"region_key": "eu",
			"created_on": "2026-01-13T23:59:45.276558Z",
			"modified_on": "2026-01-13T23:59:45.276558Z",
			"version": 1,
			"version_created_on": "2026-01-13T23:59:45.276558Z"
		}
	],
	"result_info": {
		"count": 1,
		"per_page": 25,
		"cursor": ""
	}
}

Use the type query parameter (managed or custom) to filter the results by region type. Results are paginated — pass the cursor value from a response to fetch the next page.

curl "https://api.cloudflare.com/client/v4/accounts/%7Baccount_id%7D/dls/regions/eu" \
	--request GET \
	--header "Authorization: Bearer $CLOUDFLARE_API_TOKEN"

Bind a CIDR from one of your BYOIP prefixes to a region. The cidr must fall within the prefix identified by prefix_id and be more specific than the prefix itself.

curl "https://api.cloudflare.com/client/v4/accounts/%7Baccount_id%7D/dls/regional_services/prefix_bindings" \
	--request POST \
	--header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
	--json '{
		"prefix_id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
		"cidr": "203.0.113.0/25",
		"region_key": "eu"
	}'

{
	"success": true,
	"errors": [],
	"messages": [],
	"result": {
		"id": "f0e1d2c3-b4a5-6789-0abc-def123456789",
		"prefix_id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
		"cidr": "203.0.113.0/25",
		"region_key": "eu"
	}
}

Because each CIDR can have only one binding, a create request for a CIDR that is already bound fails with an HTTP 409 conflict:

{
	"result": null,
	"success": false,
	"errors": [
		{
			"code": 1108,
			"message": "conflict: binding already exists for CIDR 203.0.113.0/24"
		}
	],
	"messages": []
}

You get this error in two cases:

• You tried to bind the entire prefix. The full prefix range (for example, the whole /24) is already in use once Cloudflare advertises your prefix, so it cannot be bound to a region directly. Bind a more specific range within the prefix instead — a /25 down to a single /32 — and cover the prefix with several sub-ranges if you need to regionalize all of its addresses.
• The CIDR is already bound. A binding for that exact range already exists, for example from an earlier request that succeeded.

To resolve it:

• List your existing bindings to see what is already configured.
• To move an existing binding to a different region, update it rather than creating a new one.
• To bind a different range, choose a CIDR that is not already bound. To replace an existing binding with a different CIDR, delete it first, then create the new one.

curl "https://api.cloudflare.com/client/v4/accounts/%7Baccount_id%7D/dls/regional_services/prefix_bindings" \
	--request GET \
	--header "Authorization: Bearer $CLOUDFLARE_API_TOKEN"

{
	"success": true,
	"errors": [],
	"messages": [],
	"result": [
		{
			"id": "f0e1d2c3-b4a5-6789-0abc-def123456789",
			"prefix_id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
			"cidr": "203.0.113.0/25",
			"region_key": "eu"
		}
	],
	"result_info": {
		"count": 1,
		"per_page": 25,
		"cursor": ""
	}
}

curl "https://api.cloudflare.com/client/v4/accounts/%7Baccount_id%7D/dls/regional_services/prefix_bindings/%7Bbinding_id%7D" \
	--request GET \
	--header "Authorization: Bearer $CLOUDFLARE_API_TOKEN"

Change the region a binding points to. Only the region_key can be updated. To change the CIDR, delete the binding and create a new one.

curl "https://api.cloudflare.com/client/v4/accounts/%7Baccount_id%7D/dls/regional_services/prefix_bindings/%7Bbinding_id%7D" \
	--request PATCH \
	--header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
	--json '{
		"region_key": "us"
	}'

{
	"success": true,
	"errors": [],
	"messages": [],
	"result": {
		"id": "f0e1d2c3-b4a5-6789-0abc-def123456789",
		"prefix_id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
		"cidr": "203.0.113.0/25",
		"region_key": "us"
	}
}

Remove a binding to stop regionalizing traffic for its CIDR.

curl "https://api.cloudflare.com/client/v4/accounts/%7Baccount_id%7D/dls/regional_services/prefix_bindings/%7Bbinding_id%7D" \
	--request DELETE \
	--header "Authorization: Bearer $CLOUDFLARE_API_TOKEN"

{
	"success": true,
	"errors": [],
	"messages": [],
	"result": null
}

• Regional Services — overview and in-region processing model.
• Available regions and product support — the full list of regions and their definitions.
• Bring Your Own IP (BYOIP) — onboard your own IP prefixes to Cloudflare.