nmap is a utility for port scanning large networks

Sometimes you need speed, other times you may need stealth. In some cases,
bypassing firewalls may be required. Not to mention the fact that you may
want to scan different protocols (UDP, TCP, ICMP, etc.).
You just can't do all this with one scanning mode.  Thus nmap
incorporats virtually every scanning technique known of.

See the nmap homepage at http://www.insecure.org/nmap/index.html

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+.\"
+.\" Copyright (c) 1998 David E. O'Brien
+.\"
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $Id$
+.\"
+.\" .TH NMAP 1L local
+.Dd August 4, 1998
+.Dt NMAP 1
+.Os BSD
+.Sh NAME
+.Nm nmap
+.Nd network port scanner
+.Sh SYNOPSIS
+.Nm nmap
+.Op Ar options
+.Ar hostname
+.Op Ar /mask
+.Sh DESCRIPTION
+.Nm
+is a utility for port scanning large networks, although it works fine for
+single hosts. The guiding philosophy for the creation of 
+.Nm
+was TMTOWTDI (There's More Than One Way To Do It). This is the Perl slogan, but
+it is equally applicable to scanners. Sometimes you need speed, other times you
+may need stealth. In some cases, bypassing firewalls may be required. Not to
+mention the fact that you may want to scan different protocols (UDP, TCP, ICMP,
+etc.). You just can't do all this with one scanning mode. And you don't want to
+have 10 different scanners around, all with different interfaces and
+capabilities. Thus
+.Nm 
+incorporats virtually every scanning technique known.
+Specifically, 
+.Nm 
+supports:
+
+      Vanilla TCP connect() scanning, 
+      TCP SYN (half open) scanning, 
+      TCP FIN (stealth) scanning, 
+      TCP ftp proxy (bounce attack) scanning 
+      SYN/FIN scanning using IP fragments (bypasses packet filters), 
+      UDP recvfrom() scanning, 
+      UDP raw ICMP port unreachable scanning, 
+      ICMP scanning (ping-sweep), and 
+      Reverse-ident scanning. 
+
+.Nm
+also supports a number of performance and reliability features such as dynamic
+delay time calculations, packet timeout and retransmission, parallel port
+scanning, detection of down hosts via parallel pings, and flexible target and
+port specification. 
+.Sh FILES
+none.
+.Sh SEE ALSO
+.Xr mscan 1L ,
+.Xr nc 1L ,
+.Xr scrobe 1L
+.Sh DIAGNOSTICS
+none.
+.Sh BUGS
+none known.
+.Sh AUTHORS
+This man page has been written by David O'Brien (obrien@cs.ucdavis.edu)
+.\" .Sh HISTORY
+.\" .Nm 
+.\" appeared in FreeBSD 3.0.