Re: How to estimate Coverage and number of scanning ports

[nnposter <nnposter () users sourceforge net>]

On 3/30/19 10:19 PM, Yusuke Osumi wrote:
> According to the book "Nmap Network Scanning" by Fyodor, at p.141,
> - 576 ports : 90% Effectivenss
> - 1558 ports : 95% Effectiveness
> I take "Effectiveness" as Coverage,
> so when I scan 600 ports, I guess coverage is over 90%. I want to
> estimate such number.

My own results of internal scanning, unobstructed by firewalls:

* top 16 ports represent 50% of all ports open
* top 74 ports represent 75% of all ports open
* top 627 ports represent 90% of all ports open
* top 4,313 ports represent 95% of all ports open

These numbers represent one large corporate entity so the curve is 
obviously compressed to the left, when compared to the universe.

Cheers,
nnposter
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