Adding custom nameservers to DNS records is an optional advanced configuration that allows you to point subdomains to other servers. Here's how to properly set this up:

Prerequisites

• Domain must be registered with Squarespace or connected via Nameserver Connect
• DNSSEC protection must be disabled before proceeding

Disable DNSSEC Protection:

1. Go to domains dashboard
2. Select your domain
3. Click DNS > DNSSEC
4. Turn off DNS Security Extensions
5. Click Confirm in the popup window

Add Custom Nameservers:

1. Go to domains dashboard
2. Select your domain
3. Click DNS > DNS Settings
4. Scroll to Custom Records
5. Click Add Record
6. Select NS as Type
7. Enter host value (example: enter "mail" for mail.yourdomain.com)
8. Add provider's NS record in Data field
9. Click Save

Remove Custom Nameservers:

1. Disable DNSSEC (follow steps above)
2. Go to DNS > Domain Nameservers
3. Click "Use Squarespace nameservers"
4. Click Save
5. Re-enable DNSSEC

Troubleshooting Tips:

• "Unable to add nameserver" error: Wait for any pending domain transfers to complete
• Can't see DNS Security Extensions switch: Delete DS records manually from DNSSEC settings
• Changes may take 24-72 hours to propagate

Note: For root domain or www modifications, refer to the nameserver modification process instead of this guide.

This configuration is not required for domains using DNS Connect - in those cases, modify DNS settings through your third-party domain provider.

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