The `check_dnsbl_parallel` function performs parallel DNS lookups against a list of 400+ DNSBL servers using `xargs -P`. It reverses the IP octets, queries each blacklist domain, and categorizes results as Clean, Blacklisted, or Other. This pattern is reusable for any batch DNS-based checks in bash and demonstrates efficient concurrency without external tools.

The `MediaUnlockTest_TikTok`, `MediaUnlockTest_DisneyPlus`, `MediaUnlockTest_Netflix`, etc., functions implement HTTP-based probes to determine if a streaming service is accessible from the IP. They use DNS checks, HTTP requests with custom headers, and response parsing to infer unlock status and region. While tightly coupled to the script's global state, the logic for each service is self-contained and could be extracted for use in other network testing tools.

The `save_json` function constructs a structured JSON report from the script's associative arrays using `jq` pipelines. It handles boolean, string, and null values, and includes nested objects for Head, Info, Type, Score, Factor, Media, and Mail. This pattern demonstrates how to build complex JSON from bash variables and is reusable for any script that needs to output structured data.