Record where the address appeared
A home-network report may show a television’s local address, a router’s upstream address and an address seen by an external service. Label each observation before comparing them. A number shown on the router’s internet status screen is not automatically a dedicated public address. Keep full addresses private when they are not needed in a public support discussion.
Identify the reserved range
RFC 6598 reserves 100.64.0.0/10 as shared address space and distinguishes it from RFC 1918 private space. In dotted notation, that block runs from 100.64.0.0 through 100.127.255.255. Seeing an upstream address inside it supplies a useful question for the internet provider, but the complete topology and provider policy still need confirmation. Do not infer every detail from a single screenshot.
Separate outbound viewing from inbound access
A question about reaching a personally managed server from outside the home is different from a television initiating an ordinary internet playback connection. Keep those tasks separate. Changing an arbitrary forwarding rule on one router does not establish control over an upstream provider’s address translation. If inbound access is an actual requirement, ask the provider what supported arrangement is available rather than promising that a local setting will solve it.
Use the information without overdiagnosing
A shared address does not by itself prove that a particular programme should fail, that a viewing account is blocked or that every other user shares the same restriction. Retain the actual error and the working comparisons. This guide explains address-space classification and an appropriate provider question; it does not recommend exposing a media device publicly or claim a UK IPTV network test.