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Overall review and finish up non-sni support section
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src/content/docs/byoip/address-maps/index.mdx

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Both IPv4 and IPv6 addresses are supported.
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---
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## How Address Maps works
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For zones using [Cloudflare's authoritative DNS](/dns/), Cloudflare typically responds to DNS queries for proxied hostnames with [anycast IPs](/fundamentals/concepts/cloudflare-ip-addresses/). However, if you [customize the IPs Cloudflare uses](/fundamentals/concepts/cloudflare-ip-addresses/#customize-cloudflare-ip-addresses) and use Address Maps, Cloudflare will respond with the IP address(es) on the address map.
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Address maps do not change [how Cloudflare reaches the configured origin](/fundamentals/concepts/how-cloudflare-works/#how-cloudflare-works-as-a-reverse-proxy). The IP addresses defined on the **DNS** > **Records** under your zone continue to instruct Cloudflare how to reach the origin.
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:::caution
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Depending on whether you use static IPs or BYOIP, the process to [create an address map](/byoip/address-maps/setup/#create-address-maps) is different.
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:::
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### Static IPs or BYOIP
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Leased static IPs allow you to use a set of specifically assigned Cloudflare IPs to ensure they do not change. Cloudflare creates an address map with your static IPs that you may edit. You cannot create another map using your static IPs.
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With BYOIP, you use your IPs by bringing an address space that you lease or own and creating an address map.
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:::caution
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Depending on whether you use static IPs or BYOIP, the process to [create an address map](/byoip/address-maps/setup/#create-address-maps) is different.
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## Immutable address maps
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src/content/docs/byoip/address-maps/setup.mdx

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## Create address maps
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To avoid any errors if you have [static IPs](/byoip/concepts/static-ips/), Cloudflare creates an address map during the static IP onboarding process. This means you cannot create a new address map with your static IPs, you may only edit the Cloudflare-created map and add or edit your zones within the existing map.
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To avoid any errors if you have [static IPs](/byoip/concepts/static-ips/), Cloudflare creates an address map during the static IP onboarding process, meaning you cannot create a new address map with your static IPs. You may only edit the Cloudflare-created map and add or edit your zones within the existing map.
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If you are using BYOIP instead, refer to the following steps:
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Setting up a default SNI is currently only supported via API.
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1. If you have not already, create an address map. [API endpoint TBC](/api/resources/addressing/subresources/address_maps/methods/create/)
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2. Take note of the address map `id`. If needed, you can use the [List Address Maps](/api/resources/addressing/subresources/address_maps/methods/list/) endpoint to retrieve it.
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3. Make sure you add the desired IP(s) to the address map. Cloudflare will respond with the default SNI on those IPs. [API endpoint TBC](/api/resources/addressing/subresources/address_maps/subresources/ips/methods/update/)
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4. Configure the `default_sni` value on the address map created in step 1. [API endpoint TBC](/api/resources/addressing/subresources/address_maps/methods/edit/). The default SNI can be any valid domain or subdomain owned by your account.
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1. If you have not already, create an address map. Refer to the [section above](#create-address-maps) or to the [Create Address Map](/api/resources/addressing/subresources/address_maps/methods/create/) API endpoint.
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2. Take note of the address map `id`. If needed, you can use the [List Address Maps](/api/resources/addressing/subresources/address_maps/methods/list/) endpoint to get it.
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3. Make sure you add the desired IPs to the address map. Cloudflare will respond with the default SNI on those IPs. Use the dashboard or refer to [Add An IP To An Address Map](/api/resources/addressing/subresources/address_maps/subresources/ips/methods/update/).
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4. Configure the `default_sni` value on the address map created in step 1. Refer to the [Update Address Map](/api/resources/addressing/subresources/address_maps/methods/edit/) API endpoint for details. The default SNI can be any valid domain or subdomain owned by your account.

src/content/docs/byoip/concepts/static-ips.mdx

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Leased static IPs allow you to use a set of specifically assigned Cloudflare IPs.
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Static IPs are allocated to the account, but can be assigned to a single zone. This means that you can place multiple zones on the same static IPs. You can also specify which zones are mapped to your static IPs and control when the IPs for your zones change.
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If you need to allowlist your IPs or to communicate your IPs to third parties, allocating static IPs to your account allows you to know them ahead of time.
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Lease static IPs so that you can use a set of specifically assigned Cloudflare IPs. If you need to allowlist your IPs or to communicate your IPs to third parties, allocating static IPs to your account allows you to know them ahead of time.
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Cloudflare will not change static IP addresses without notifying you, and will typically only do so at your request.
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:::note
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Although BYOIP and static IPs are different offerings, both can be managed via [Address Maps](/byoip/address-maps/).
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Although BYOIP and static IPs are different offerings, both can be managed using [Address Maps](/byoip/address-maps/).
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Static IPs are allocated to the account, but can be assigned to a single zone. This means that you can place multiple zones on the same static IPs. You can also specify which zones are mapped to your static IPs and control when the IPs for your zones change.
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## Availability
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Static IPs are available as an add-on purchase for Enterprise plans.

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