> For the complete documentation index, see [llms.txt](https://docs.os.uk/osngd/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.os.uk/osngd/data-structure/address/address-related-components/delivery-point-alias.md). # Delivery Point Alias {% hint style="warning" %} This page details upcoming data that will be provided for the new Delivery Point Alias Related Component in the OS NGD Address Theme from the start of October 2026 to give you early insight. The new related component won't be available via OS Select+Build (the bespoke OS NGD data download service) until the start of October when data schema version 2.0 of the Royal Mail Address Feature Types is released. The information on this page is as accurate as possible but is subject to change before launch. {% endhint %} The Delivery Point Alias Component provides alias data related to a delivery point address. It sources data from Royal Mail's Delivery Point Alias (DPA) table. DPA information provides additional Delivery Point Information, including Trading Names and Building Name details where a Building Number is the official building identifier. For more information about the DPA table, please consult chapter six 'Alias' of the [Royal Mail Programmer's Guide](https://www.poweredbypaf.com/resources/). {% hint style="info" %} ### Delivery Point Alias Component for Royal Mail Address Feature Type data schema version 2.0 onward Customers taking data schema version 2.0 onward of the Royal Mail Address Feature Type in GeoPackage format will receive the following in their data package: * **Feature type:** Royal Mail Address * **Related components:** Multiple Residence, Delivery Point Alias and Other Alias However, the three related components (Multiple Residence, Delivery Point Alias and Other Alias) will only be provided for Royal Mail Address features if the Description attribute is 'Postcode Address File'. Against all other Royal Mail Address features, the related components will be populated as null. {% endhint %} ## Temporal filtering The earliest date on which you can request a one-off snapshot of a date in the past for data in this feature type is 01 October 2026. Any data temporally filtered earlier than the specified earliest date noted above for the data schema version may contain data inconsistencies. More information about temporal filtering is available from the [Getting started with temporal filtering guide](/osngd/getting-started/downloading-with-os-select+build/getting-started-with-data-packages/getting-started-with-temporal-filtering.md). ## Related component attributes The following sub-sections provide details about the attributes included with this related component, their data types in the different output formats, and other important metadata about them. ### aliasid Ordnance Survey derived primary key providing a unique row identifier assigned to enable indexing for efficient querying. * **Data Types:** String (GPKG), String (CSV) * **Nullable:** false * **Max Length:** 36 * **OS Select+Build Filterable:** No * **Data Schema Version:** 2.0 ### udprn Unique Delivery Point Reference Number (UDPRN) assigned by Royal Mail as a persistent identifier, belonging to the feature of which the alias relates to. * **Data Types:** Integer (GPKG), Integer (CSV) * **Nullable:** false * **OS Select+Build Filterable:** No * **Data Schema Version:** 2.0 ### featuretypeversiondate Date of the feature version to which this related component applies. This is used along with the Feature Type ID attribute to join the component to the Royal Mail Address Feature Type. * **Data Types:** Date (GPKG), Date (CSV) * **Nullable:** false * **OS Select+Build Filterable:** No * **Data Schema Version:** 2.0 ### alias Contains alias name text, derived from the Delivery Point Alias (DPA) source table. * **Data Types:** String (GPKG), String (CSV) * **Nullable:** false * **Max Length:** 75 * **OS Select+Build Filterable:** No * **Data Schema Version:** 2.0 ### aliasrecordtype Indicates the source alias table from which the record has been derived. * **Data Types:** String (GPKG), String (CSV) * **Nullable:** false * **Max Length:** 25 * **OS Select+Build Filterable:** No * **Data Schema Version:** 2.0 ### aliascategory Describes the subdivisions of Delivery Point Alias (DPA) table. * **Data Types:** String (GPKG), String (CSV) * **Nullable:** false * **Max Length:** 50 * **OS Select+Build Filterable:** No * **Data Schema Version:** 2.0 ### aliascurrency Describes the currency of the Delivery Point Alias (DPA) provided. * **Data Types:** String (GPKG), String (CSV) * **Nullable:** false * **Max Length:** 10 * **OS Select+Build Filterable:** No * **Data Schema Version:** 2.0 ### aliascode Royal Mail raw alias component information, containing concatenated components and codes as a single string attribute. * **Data Types:** String (GPKG), String (CSV) * **Nullable:** false * **Max Length:** 150 * **OS Select+Build Filterable:** No * **Data Schema Version:** 2.0 --- # Agent Instructions This documentation is published with GitBook. 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