Wouldn't the US DOD be an example of this? They have a /8 so surely there are plenty of /24 not routed. On Tue, Aug 19, 2025 at 12:34 PM Sriram, Kotikalapudi (Fed) via NANOG < nanog@lists.nanog.org> wrote:
Question: Can a prefix be never routed on the Internet but used only one-way for source address in IP packets?
That is. a user owns an IP prefix. They never advertise a route to it in BGP on the Internet. But they use the prefix solely for source address in IP traffic from a source to a destination (sink). In this set up, the destination server obviously cannot/doesn't return any acknowledgements etc. to the source. Anyone aware if there is any such known application in use on the Internet - even if it is rare? Thanks.
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