> On 23 Jan 2020, at 15:20, Rob Brew <[email protected]> wrote:
> 
> The server knows the IP address being queried (which never changes), based on 
> the IP address for public sites which include underground rail stations.
> 

Doesn’t that depend on the network architecture?

The IP address of the client may well be a NAT address with a public address 
that covers many railway stations.

- Stewart
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