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PsPing is successfull for non-existent addresses

In several subnets in our organization ICMP request with PsPing is successful for every IPv4 address (even non-existent). For these addresses "usual" Ping returns "Destination net unreachable". Message Analyzer shows there's no Echo Reply received. Nevertheless PsPing returns OK.
The subnets are separated by routers that filter out addresses / ports that are not explicitly allowed.

Example (non-existent address):

Pinging with 32 bytes of data:
5 iterations (warmup 1) ping test:
Reply from 1.88 ms
Reply from 1.57 ms
Reply from 1.60 ms
Reply from 1.77 ms
Reply from 1.58 ms

Ping statistics for
Sent = 4, Received = 4, Lost = 0 (0% lost)
Minimum = 1.57ms, Maximum = 1.77 ms, Average = 1.63 ms

There's another subnet where PsPing returns "Request timed out" (that's correct). In this subnet Ping also returns "Request timed out".

Maybe PsPing works incorrect in situations where Ping returns "Destination net unreachable", but works correct when Ping returns "Request timed out"?

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