Sub ID
A Sub ID is an additional tracking parameter appended to an affiliate link that allows affiliates to identify specific traffic sources, campaigns, or placements within their overall referral activity.
What it means in practice
A Sub ID is a custom tracking parameter that affiliates attach to their affiliate link to break down performance at a granular level. Instead of seeing aggregate conversions from one tracking link, Sub IDs let affiliates tag individual traffic sources -- such as a specific banner, landing page, email campaign, or social media post -- so they can analyze which exact placement drove each conversion. This data flows through the operator's tracking system alongside the standard postback and attribution data.
Affiliates use Sub IDs to run more effective optimization. For example, a media buyer running paid campaigns across multiple ad networks can assign a unique Sub ID to each network, creative, or audience segment. When conversion rate data comes back tagged with these Sub IDs, the affiliate can see exactly which combinations are profitable and which are not -- without needing a separate tracking link for every variation. Most affiliate programs support multiple Sub ID slots (commonly labeled sub1, sub2, sub3), enabling multi-dimensional analysis.
For operators, Sub IDs provide transparency into how affiliates drive traffic. When reviewing affiliate quality or investigating suspicious patterns, Sub ID data reveals whether an affiliate is sending traffic from legitimate placements or questionable sources. Combined with s2s tracking, Sub IDs create a detailed picture of the entire conversion path from click to customer, benefiting both the affiliate and the operator.
How Sub ID works across industries
See how sub id is applied in the verticals Track360 supports, from qualification logic and payout structure to the operational context behind each model.
How Track360 handles this
Track360 supports multiple Sub ID parameters on every affiliate link, with full Sub ID data flowing through to real-time reporting dashboards. Operators and affiliates can filter performance data by Sub ID to analyze traffic sources, optimize campaigns, and identify top-performing placements.
Frequently Asked Questions
Common questions about sub id, how it works in affiliate programs, and where it shows up across Track360's supported verticals.
A Sub ID is an extra tracking parameter added to an affiliate link that helps affiliates identify specific traffic sources, campaigns, or placements. For example, an affiliate might use sub1=homepage_banner and sub2=top_position to track exactly which banner placement on which page drove a conversion.
Related Terms
Affiliate Link
An affiliate link is a unique tracked URL assigned to an affiliate that attributes clicks, conversions, and commissions to the correct partner.
Postback
A postback is a server-to-server HTTP callback confirming a conversion event like a registration, FTD, or purchase. Unaffected by ad blockers or cookies.
Deep Linking
An affiliate tracking method that sends referred users directly to a specific page (such as a game, product, or landing page) rather than the homepage, while maintaining attribution.
S2S Tracking (Server-to-Server)
S2S tracking records affiliate conversions server-to-server, bypassing the browser. Unaffected by ad blockers or cookie restrictions.
Conversion Rate
The percentage of clicks or visitors that complete a desired action, such as making a first deposit, opening an account, or purchasing a trading challenge.
Continue Learning
Free structured courses that cover this topic and more.
How to Migrate an Affiliate Program Without Breaking Attribution
A practical migration plan for operators moving from an existing affiliate or IB system. Map your stack, protect attribution, preserve payout logic, and move to a new setup without creating reporting chaos.
How to Structure Affiliate Commissions
CPA, RevShare, hybrid models, KPI-based deals, and multi-tier payout logic. How to pick the right structure for your program, negotiate without losing margin, and adjust as your affiliate base grows.
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