Re: Can a prefix be never routed on Internet but used only for source address in IP packets?

[Josh Luthman via NANOG <nanog () lists nanog org>]

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.
>
> Sriram
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