SignalBridgeKey Benefits
Everything you need to know about this feature
Your Own Subdomain
Use a subdomain like data.yoursite.com, or track.yoursite.com, for tracking.
Up to 365-Day Cookies
Our server sets the visitor cookie for 365 days. Chrome allows cookies of up to 400 days; Safari caps cookies set through a third-party CNAME at 7 days.
First-Party Context
A subdomain of your own site is first-party, so browsers do not block its cookies the way they block third-party cookies.
Easy 5-Minute Setup
Just add a CNAME record to your DNS. We provide step-by-step instructions.
How It Works
Get started in minutes with our simple setup process
1. Choose Subdomain
Pick a subdomain like data.yoursite.com. It can be anything you want.
2. Add CNAME Record
Add one CNAME record in your DNS pointing to SignalBridge servers.
3. Verify & Track
We automatically verify your domain and issue an SSL certificate.
Why Custom Domains Are Critical
Safari blocks all third-party cookies, Firefox confines each one to the site that created it, and ad blockers match tracking requests by domain. A tracking subdomain on your own site is first-party, so those rules treat it differently.
First-Party vs Third-Party
The difference is trusted identity.
- ✕ Blocked outright by Safari
- ✕ Confined to one site in Firefox
- ✕ Matched by ad blocker domain lists
- ✕ Still allowed by default in Chrome
- ✕ Poor attribution accuracy
- ✓ Up to 365-day lifespan (Chrome limit: 400 days)
- ✓ Not blocked as third-party cookies
- ✓ Harder for ad blockers to match by domain
- ✓ Future-proof technology
- ✓ Reliable Attribution accuracy
Safari applies a separate rule: WebKit caps cookies set through a subdomain that resolves to a third party's hostname at 7 days. See the sourced cookie statistics for each browser's rules.
How It Works
Because the tracking request goes to a subdomain of your own site (data.yoursite.com), browsers treat it as "first-party" - belonging to you. Its cookies are not blocked as third-party cookies, and in Chrome they can last for up to 400 days.
Setup In 3 Steps
Choose Subdomain
Pick something like data.yoursite.com or track.yoursite.com
Add CNAME
Add a CNAME record pointing your subdomain (e.g. `data`) to `pixel.signalbridgedata.com`
Verify
We detect the record, issue an SSL certificate, and you're live!
Enterprise-Grade Infrastructure
"SignalBridge helped us secure and future-proof our tracking using custom domains and first-party cookies. … This had a huge impact on attribution accuracy and long-term data reliability."
