http://pan.baidu.com/s/1bo2IH9X#netcat  云盘下载

[root@bass ~]# tar -xjvf netcat-0.7.1.tar.bz2

[root@bass ~]# cd netcat-0.7.1

[root@bass ~]# ./configure --prefix=/usr/local/netcat

[root@bass ~]# make && make install

[root@bass ~]# tree /usr/local/netcat/

/usr/local/netcat/

├── bin

│   ├── nc -> netcat

│   └── netcat

├── info

│   ├── dir

│   └── netcat.info

├── man

│   └── man1

│       └── netcat.1

└── share

    └── locale

        ├── it

        │   └── LC_MESSAGES

        │       └── netcat.mo

        └── sk

            └── LC_MESSAGES

                └── netcat.mo

10 directories, 7 files

[root@bass ~]# nc -h

usage: nc [-46DdhklnrStUuvzC] [-i interval] [-p source_port]

	  [-s source_ip_address] [-T ToS] [-w timeout] [-X proxy_version]

	  [-x proxy_address[:port]] [hostname] [port[s]]

	Command Summary:

		-4		Use IPv4

		-6		Use IPv6

		-D		Enable the debug socket option

		-d		Detach from stdin

		-h		This help text

		-i secs		Delay interval for lines sent, ports scanned

		-k		Keep inbound sockets open for multiple connects

		-l		Listen mode, for inbound connects

		-n		Suppress name/port resolutions

		-p port		Specify local port for remote connects

		-r		Randomize remote ports

 		-S		Enable the TCP MD5 signature option

		-s addr		Local source address

		-T ToS		Set IP Type of Service

		-C		Send CRLF as line-ending

		-t		Answer TELNET negotiation

		-U		Use UNIX domain socket

		-u		UDP mode

		-v		Verbose

		-w secs		Timeout for connects and final net reads

		-X proto	Proxy protocol: "4", "5" (SOCKS) or "connect"

		-x addr[:port]	Specify proxy address and port

		-z		Zero-I/O mode [used for scanning]

	Port numbers can be individual or ranges: lo-hi [inclusive]

扫描21-9000端口TCP：

[root@bass ~]# nc -v -w 2 192.168.1.35 -z 21-9000

-v 详细输出 -w secs timeout的时间 -z 端口的范围

扫描21-80端口UDP

[root@bass ~]# nc -z -v -u -n 122.56.183.103 21-80

Connection to 122.56.183.103 27 port [udp/*] succeeded!

Connection to 122.56.183.103 37 port [udp/*] succeeded!

Connection to 122.56.183.103 41 port [udp/*] succeeded!

Connection to 122.56.183.103 44 port [udp/*] succeeded!

Connection to 122.56.183.103 50 port [udp/*] succeeded!

Connection to 122.56.183.103 62 port [udp/*] succeeded!

Connection to 122.56.183.103 65 port [udp/*] succeeded!

Connection to 122.56.183.103 69 port [udp/*] succeeded!

Connection to 122.56.183.103 80 port [udp/*] succeeded!

扫描21-80端口TCP

[root@bass ~]# nc -z -v -n 122.56.183.103 21-80

Connection to 122.56.183.103 21 port [tcp/*] succeeded!

Connection to 122.56.183.103 22 port [tcp/*] succeeded!

nc: connect to 122.56.183.103 port 23 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 24 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 25 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 26 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 27 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 28 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 29 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 30 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 31 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 32 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 33 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 34 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 35 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 36 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 37 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 38 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 39 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 40 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 41 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 42 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 43 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 44 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 45 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 46 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 47 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 48 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 49 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 50 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 51 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 52 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 53 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 54 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 55 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 56 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 57 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 58 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 59 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 60 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 61 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 62 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 63 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 64 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 65 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 66 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 67 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 68 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 69 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 70 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 71 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 72 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 73 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 74 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 75 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 76 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 77 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 78 (tcp) failed: Connection refused

nc: connect to 122.56.183.103 port 79 (tcp) failed: Connection refused

Connection to 122.56.183.103 80 port [tcp/*] succeeded!

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