A subdomain forwards traffic from an extension of your domain (like blog.yourdomain.com) to your Squarespace site. Here's how to connect a third-party subdomain to Squarespace.

Prerequisites:

• A registered domain with full DNS services
• Subdomain already set up with your provider

Step 1: Start the Connection

1. Go to Domains panel
2. Click "Use a Domain I Own"
3. Enter your subdomain name
4. Click "Connect From Provider"
5. Select "Other" from dropdown
6. Click "Connect Domain"
7. Click "Okay"

Step 2: Access DNS Settings

Log into your domain provider account and locate DNS management (may be called Zone File Settings, Domain Manager, or similar).

Step 3: Add First CNAME Record

Create a CNAME record with:

• Host: [verification code].subdomain (add period at end)
• Type: CNAME
• Points to: verify.squarespace.com

Step 4: Add Second CNAME Record

Create another CNAME record with:

• Host: your subdomain (e.g., "blog")
• Type: CNAME
• Points to: ext-cust.squarespace.com

Step 5: Verify Connection

1. Return to Squarespace DNS Settings
2. Click "Refresh records"
3. Wait up to 72 hours for changes to process

Step 6: Disable WWW Prefix (if primary domain)

1. Open Domains panel
2. Click the subdomain
3. Turn off "Use www prefix" toggle

Troubleshooting Tips:

If CNAME Records Aren't Supported:

• Use TXT records instead
• Follow same steps but select TXT as Record Type

If Connection Fails:

• Use DNS checker tool in Domains panel
• Remove conflicting A records
• Ignore "Record not found" for A records
• Contact domain provider if issues persist

Note: Connection can take 24-72 hours to complete. The www CNAME will show as "Record not found" even after successful connection.

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