It is not necessary to register a new domain name for shortening links if you own one that works properly. Create a subdomain using a domain you already have.

Before using Cloudflare for a subdomain, enable the service for your main domain.

When your main domain is active in Cloudflare, add a subdomain.

1. Log into your Cloudflare account.

2. Select the DNS icon.

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3. Add two A-records:

- A-record; your subdomain Host; 52.21.33.16 IP address.

- A-record; your subdomain Host; 18.184.197.212 IP address.

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4. Go to your Short.io account.

5. Open the User menu and choose "Add a domain.

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6. Choose the third option — Add my own domain

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7. Specify a domain and confirm that this domain is dedicated only for shortening links.

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8. Go to your domain settings to check if the domain is active.

Important: Wait a few hours and refresh a domain status in Short.io domain settings.

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9. After the domain is active, feel free to shorten links and enjoy Short.io.

The video guide helps to configure a subdomain.

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