All IP addresses of Her Majesty's Revenue and Customs
All IP ranges of all Internet Service Providers (ISPs) and organizations with dedicated IP ranges.
Link to your report: https://w-e-b.site/?act=report&id=71b1d6f0b5fb6a92544b8fdc5b627d6fAll IP ranges of Her Majesty's Revenue and Customs
163.171.0.0/18