2 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
Is the IPv4 address inside 169.254.0.0/16 (link-local)? Pure bit-mask check, no network call, returning inside true/false with the range's first/last address and size. Precise allow/deny rules for a well-known block. $0....
Bulk is ip in link local: up to 20 ips in one call, processed concurrently, results in input order with a per-item error field and a failure count. Same answer per item as the single endpoint. Batch enrichment for agents...