Data collection system that receives plurality of user network data access flows that include HTTP/HTTPS URLs from network probes or network elements such as CDNs, Proxies, control plane logs (S11, SlAP etc.) that include permanent subscriber identifier (IMSI, IMEI) or obfuscated subscriber identifiers, or obtains such identifiers corresponding to user IP addresses in access flows from operator network elements, extracts plurality of unique identifiers (UUIDs), plurality of tags, or contextual identifiers that appear in URL strings, determines domain names from HTTP/HTTPS header fields or temporally close DNS flows and generates a mapping table that includes subscriber identifiers, domain names, HTTP tags, and associates subset of UUIDs as potential Advertisement Identifier (Ad-Id) for each subscriber-id based on the usage counts of that UUID across multiple domains.
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