Proximity - Access Card Calc 4+

Access Card Calculator

Farren Domenici

Designed for iPhone

    • 5.0 • 1 Rating
    • $0.99

iPhone Screenshots


Have a "naked" access card or fob and need to determine its appropriate number and facility code? If you're able to extract the binary or hexadecimal value then Proximity will do the rest.

The first calculator of Proximity works one of two ways:
By inputting the raw binary value of the card or by inputting the hex equivalent.

To use the binary input, simply tap on the box and type in the binary value. The counter in the lower-right corner of the box will keep track of the amount of digits currently displayed.

To use the hex input, tap on the box and enter the hex value. Once complete, select the bit length from the wheel below. This is only necessary when calculating from a hex value.

After tapping on calculate, the output will be displayed. If there is more than one system in the same bit length, tap on Next to cycle through the different formats.

The second calculator is simply the reverse of the first:

Input the facility code, card number, select the format, and tap calculate to generate the raw binary value.

More formats will be released in future versions so long as the information is acquired. If there's a format not on this app and you have the breakdown information, send it to me and I'll fulfill the request.

Currently supports the following formats:

26 bits HID® Standard (H10301)
26 bits Indala
31 bits HID® ADT
33 bits HID® Standard (D10202)
34 bits HID® Standard (H10306)
34 bits HID® Northern (N1002)
34 bits Indala Optus
35 bits HID® Corporate 1000®
36 bits Simplex
36 bits Lenel
36 bits S2
37 bits HID® Farpointe (H10304)
37 bits HID® (no Facility Code) (H10302)
37 bits HID® PointGuard
37 bits Software House
40 bits Casi Rusco
40 bits XceedID
40 bits Honeywell (P10001)
48 bits HID® Corporate 1000®

 HID® and Corporate 1000® are registered trademarks of HID Global Corporation or its affiliates. This application is not affiliated with nor endorsed by HID Global Corporation.

Compatibility: iPhone / iPod touch on iOS 8.0 or later and iPad on iOS 12.0 or later.

Found a bug? Something not working? Have a suggestion? Feel free to contact me via email:

What’s New

Version 1.5.1

---Note: This update requires a minimum version of iOS 12.0---

-Under the hood service to maintain a healthy running app

Ratings and Reviews

5.0 out of 5
1 Rating

1 Rating

DreaDmii ,

Extremely Handy App to have!

This is a great tool! handy to have and covers many card formats.

Developer Response ,

Thanks! Glad you like!

CG100110011 ,

App doesn’t work

34bit HID Standard does not calculate correctly when using reverse lookup

If hexadecimal value input is entered the correct facility code and card number is displayed.

Developer Response ,

I'm sorry that you're having issues. Firstly, any support should be addressed to me via email and not as a 1 star review stating the app doesn't work. If there are any issues I would greatly appreciate the heads up so that I can address and repair as needed. Secondly, I took a look into the issue but could not find any errors. Keep in mind the reverse lookup does not take into account for parity bits. Please send me an email at with details/screenshots so that I can look into this further. Thank you.

J D Mundy ,

Doesn't work at all

I have several card types that I have used on an existing card access system, and know the raw hexadecimal code of my card and its translation to facility code and card number. This app doesn't even get it close and I wasted 99 cents on it. Used it to try and find the fac. code and card number of an unknown card and guess the bit structure, but it's translations are garbage.

Developer Response ,

Sorry you are having issues! I would love to help but I need to know the following: Which formats are not working for you? Would you be able to provide examples? Also, which device and iOS version are you using?

App Privacy

The developer, Farren Domenici, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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