paping return success on any port even though nothing is listing on that port on local machine. When I do the same with

nmap -p 4000 127.0.0.1

output is like this

Starting Nmap 5.00 ( http://nmap.org ) at 2010-10-06 11:33 IST Interesting ports on DH (127.0.0.1): PORT STATE SERVICE 4000/tcp closed remoteanything

however with paping

paping 127.0.0.1 -p 400 -c 3

output is like this

paping v1.5.1 - Copyright (c) 2010 Mike Lovell

Connecting to 127.0.0.1 on TCP 400:

Connected to 127.0.0.1: time=0.05ms protocol=TCP port=400 Connected to 127.0.0.1: time=0.09ms protocol=TCP port=400 Connected to 127.0.0.1: time=0.07ms protocol=TCP port=400

Connection statistics: Attempted = 3, Connected = 3, Failed = 0 (0.00%) Approximate connection times: Minimum = 0.05ms, Maximum = 0.09ms, Average = 0.07ms

How is it able to connect if nothing is listing on that port