Security Basics
Re: nmap port name question? Sep 18 2013 10:19PM
ToddAndMargo (ToddAndMargo zoho com)
>> 2013/9/17 ToddAndMargo <ToddAndMargo (at) zoho (dot) com [email concealed]
>> <mailto:ToddAndMargo (at) zoho (dot) com [email concealed]>>
>> Hi All,
>> When nmap tells you a service associated with a
>> port, for example,
>> 137/tcp closed netbios-ns reset
>> does nmap get the name of the port from my /etc/services,
>> or is the name hard coded into nmap?
>> Many thansk,
>> -T

On 09/18/2013 02:19 PM, Molinero wrote:
> "While Nmap does many things, its most fundamental feature is port
> scanning. Point Nmap at a remote machine, and it might tell you that
> ports |25/tcp|, |80/tcp|, and |53/udp| are open. Using its
> |nmap-services| database of more than 2,200 well-known services, Nmap
> would report that those ports probably correspond to a mail server
> (SMTP), web server (HTTP), and name server (DNS) respectively..."

Hi Molinero,

My main focus was that nmap was using its own updates tables.
My /etc/services comes from RHEL, which, by Red Hat's design, is
purposfully "out-of-date". I wanted to make sure I was
not missing any new services. Thank you for the help!

This is what blew my mind:

# nmap --reason

Starting Nmap 6.25 ( ) at 2013-09-16 19:42 PDT
Nmap scan report for (
Host is up, received arp-response (0.00044s latency).
Not shown: 989 closed ports
Reason: 989 resets
135/tcp open msrpc syn-ack
139/tcp open netbios-ssn syn-ack
445/tcp open microsoft-ds syn-ack
1110/tcp filtered nfsd-status no-response
5357/tcp open wsdapi syn-ack
49152/tcp open unknown syn-ack
49153/tcp open unknown syn-ack
49154/tcp open unknown syn-ack
49155/tcp open unknown syn-ack
49156/tcp open unknown syn-ack
49157/tcp open unknown syn-ack

What were all these 4915x ports? Turned out they were
all M$ RPC ports.


Port Serv Process name
49152, msrpc [wininit.exe]
49153, msrpc [svchost.exe, Eventlog]
49154, msrpc [svchost.exe, Schedule]
49155, msrpc [lsass.exe]
49157, msrpc [services.exe]
49159, msrpc [svchost.exe, PolicyAgent]

Many thanks,

Computers are like air conditioners.
They malfunction when you open windows


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