HID Corporate 1000 Compatible Cards (35-bit & 48-bit)

What HID Corporate 1000 Is and Why It Requires Compatible Credentials

HID Corporate 1000 is a registered, organization-controlled proximity format — not an open Wiegand scheme anyone can issue at will. When an organization enrolls in the Corporate 1000 program, it receives a registered company code that is unique to that organization across the entire installed base. That company code is embedded in every credential issued under the program, distinguishing the organization's cards from those of every other enrolled enterprise worldwide. The format comes in two widths: 35-bit, which carries a 12-bit company code and a 20-bit card number, and 48-bit, which widens both fields to accommodate larger deployments. Our HID Corporate 1000 48-bit compatible card covers the expanded configuration in detail.

Because the company code is registered to the enrolled organization — not to a card vendor — sourcing compatible credentials does not require going back to the original supplier. Any manufacturer who can encode the correct data structure to your registered company code can produce a credential that reads correctly on your enrolled readers. Security ID Systems supplies those compatible cards and fobs, encoded to the company code and card-number range that belongs to your program.

35-Bit vs 48-Bit Corporate 1000: Format Structure

The 35-bit Corporate 1000 format allocates 12 bits to the company code (values 0–4095) and 20 bits to the card number (values 0–1048575), with parity bits completing the frame. This structure was designed to provide meaningful separation between organizations while giving each enrolled enterprise a substantial card-number space for large deployments. Most long-established Corporate 1000 programs operate on 35-bit, and the format remains the more common of the two in the field.

The 48-bit variant — also referred to as C1K48 — expands the company code field and the card-number field, extending the address space for enterprises that have exhausted or anticipate exhausting the 35-bit range, or for organizations with complex multi-site hierarchies that benefit from a wider company-code namespace. The two widths are not interchangeable at the reader; a panel configured for 35-bit will not parse a 48-bit credential correctly without a format reconfiguration. Our Wiegand format guide explains how bit widths interact with reader configuration in practical terms.

Both widths are carried on the same physical credential technologies. 125 kHz LF proximity cards using T5577 or EM4305 writable substrates are the most common carrier for Corporate 1000, though iCLASS multi-technology cards that carry Corporate 1000 data on the LF layer alongside a 13.56 MHz smart layer also exist in the field. Our HID iCLASS compatible credentials cover the iCLASS layer for installations that run both frequencies.

• 35-bit: 12-bit company code (0–4095), 20-bit card number (0–1048575)
• 48-bit (C1K48): expanded company code and card-number fields for larger deployments
• Both widths available on 125 kHz proximity (T5577/EM4305) substrates
• iCLASS multi-technology variants carry Corporate 1000 data on the LF layer
• The two widths are not reader-interchangeable without panel reconfiguration

The Organization Controls the Numbering — Not the Card Supplier

A point that causes confusion when organizations first look for compatible Corporate 1000 credentials: numbering authority sits with the enrolled organization, not with any card supplier. The registered company code was issued to your organization when it enrolled in the program. Card numbers within that company code are yours to assign. When you order compatible credentials from Security ID Systems, you supply the company code and the card-number range you want encoded — we do not assign numbers, and we do not maintain a number registry on your behalf.

This is substantively different from open formats such as 26-bit H10301, where facility codes are unregistered and any supplier can encode any value. With Corporate 1000, the company code value you provide is the one registered to your organization, and the encoded credentials will read correctly on any reader configured for your program. If you are unsure of your registered company code, that information is typically held by your access control platform administrator or was documented when your organization originally enrolled.

Organizations that have deployed other registered or organization-controlled formats — for example, Indala FlexSecur or Inner Range compatible credentials — will recognize this pattern: the credential supplier encodes to your specification, the organization retains numbering authority. Our guide to Corporate 1000, FlexSecur, and custom facility codes covers how enrolled-format programs work across multiple product families.

Encoded for Your Enrolled Program

We supply Corporate 1000 compatible cards and fobs encoded to your company code and card-number range before shipment. Credentials arrive ready to register in your access control software — no field encoding, no separate programming hardware required on your side. For sequential deployments, provide a starting card number and a quantity; for gap-fills or individual replacements, provide a numbered list. Both approaches are available on any order size.

Where your installation runs high-security or custom format readers alongside Corporate 1000, we can supply coordinated batches across formats in a single order. Facilities running mixed-technology deployments — for example, a building where Corporate 1000 proximity readers operate alongside HID Seos portals — can consolidate sourcing rather than managing separate suppliers per technology. For installations where Corporate 1000 credentials are required alongside other registered-format cards, our compatible vs genuine cards buyer's guide explains the practical implications of sourcing compatible credentials for enrolled programs.

If you operate a Wiegand bit-format environment and want to cross-reference how Corporate 1000 fits alongside other wide-format schemes you may be managing — such as ADT 31-bit compatible cards or HID H800002 46-bit compatible cards — those format pages document the structure and compatible substrate options for each.

Request a Corporate 1000 Quote

To receive a quote, provide the following: the format width (35-bit or 48-bit), your registered company code, the card-number range or list you need encoded, credential type (ISO card, clamshell card, or key fob), and quantity. If your deployment spans multiple sites with the same company code but different card-number blocks, supply a per-site breakdown and we quote the full order as a single submission. Bulk orders receive consolidated pricing; there is no minimum order quantity for standard credential types.

Integrators and facilities managers sourcing Corporate 1000 credentials for multiple client programs can discuss standing arrangements for recurring encoded orders. We also supply compatible credentials for adjacent registered formats and proprietary schemes — if your estate includes formats such as HID iCLASS Elite compatible credentials or HID custom bit-length proximity cards, those can be quoted alongside your Corporate 1000 requirement.

Use the contact form to submit your specification. Security ID Systems is an independent manufacturer and supplier of compatible access-control credentials and is not affiliated with, authorized by, or endorsed by HID Global.