An address starting with “5” or a capital letter indicates that your account is using a Substrate (5) or Kusama (capital letter) address. The following address formats apply:

  • Kusama: addresses start with a capital letter
  • Polkadot: addresses start with a 1
  • Substrate: addresses start with a 5

If your address is showing the wrong prefix, here is how to change it: 

1. On polkadot.js

  1. Go to the Settings tab
  2. Select "Default for connected node" 
  3. Click Save & Reload
  4. Your addresses will now always show in the correct format, whether you have Polkadot or Kusama selected on the top left. 

2. In the polkadot.js browser extension:

  1. Click on the gear icon in the upper-right corner.
  2. In the pulldown “Display Address Format For”, select Polkadot or Kusama - depending which format you're looking for. 

Your addresses will immediately change to the correct format.

3. We also have a quick address conversion tool here: 

Click on the image below to convert your addresses in our Wiki.

Please let us know below if you found this article helpful or email us at Support if we can be of further assistance.