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I've been trying to build a ham related website. I'm looking for a list of call signs. Here's the trick: I need the URL to change based on the zip code. I want to be able to put the link on a page, have someone click on it and not have to do anything else. I have checked three resources: The ULS database, QRZ, and Radio QTH. The lists are there, but the URL does not change based on individual searches.

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    $\begingroup$ I voted to close this question because it's about web programming, not amateur radio, even though the OP wants to create a ham-related web site. $\endgroup$ – rclocher3 Mar 15 '18 at 19:21
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    $\begingroup$ Your description is not very clear - I need the URL to change based on zip code? Are you aware you can download the entire ULS database allowing you to render it within your page? $\endgroup$ – Glenn W9IQ Mar 15 '18 at 19:24
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    $\begingroup$ @rclocher3 I argue against closing it because it's not about web programming as much as it's about finding a suitable source for ham radio license information. The fact that the OP wants to use that data source for a web site is incidental. $\endgroup$ – mrog Mar 15 '18 at 20:12
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    $\begingroup$ How will you handle non-US ham visitors? $\endgroup$ – Jim MacKenzie VE5EV Mar 15 '18 at 20:39
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    $\begingroup$ @mrog that's about as good as asking for a product: An information source is a service. $\endgroup$ – Marcus Müller Mar 15 '18 at 22:39
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You can use radioreference.com, as in this example: https://www.radioreference.com/apps/ham/?action=search&zipcode=12345

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If you are building a site that allows someone to put in a zip code to see the hams around them, it may prove more beneficial to allow them to see the hams that are within a certain mile radius of the zip code. I did this for a club that was offering licensing classes and wanted to send postcards to all of the hams of a particular license class within a specified radius.

If this interests you, take a look at a site like zipcodestogo. I programmatically entered the zip code and radius and then stripped out the zip code information from the returned page. I then used this to filter a SQL database of the ULS data that was downloaded weekly from the FCC site. The ULS download is well documented by the FCC. This is what QRZ uses for their U.S. call sign lookups.

You can also drive the addresses of your filtered results to place pins on Google Maps to get a nice view of the ham population in the selected area.

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