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What can you find out from an IP?

What can you find out from an IP?

Here I will outline some use full Unix and NT commands for finding out more information about a given IP. Some of these techniques will fail depending on firewall rule sets. 

How do I find my own IP?

How do I find out if an IP is contactable?

How do I find out what organization owns an IP?

How do I find out what OS a box is running?

How do I find out what ports are open/services are running?

How do I tell who is logged in to that box?

Any good all in one tools?

How Do I find the NetBIOS name from the IP?

How Do I find the IP from the NetBIOS name?

How can I see the traffic going between two IPs on a switched network?

Change Log

 

How do I find my own IP?

Because the IP your ISP's DHCP server hands you may not always be the same it is handy to be able to quickly find out what your IP is. Most of the time on a LAN the DHCP server will try to hand a machine the same IP it's MAC address received the last time it requested an address, but not always. To find out your host IP and other useful information use these commands.

Windows 9X/Me:

Use the "winipcfg" command, this will bring up a GUI dialog with all the info you will need.

Windows NT/2000/XP/etc:

Use the "ipconfig command.

C:\>ipconfig /all

Windows 2000 IP Configuration

Host Name . . . . . . . . . . . . : libg-adrian1
Primary DNS Suffix . . . . . . . : myads.mydomain.com
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : myads.mydomain.com
                                    mydomains.com
                                    mydomain.com

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . : mydomains.com
Description . . . . . . . . . . . : 3Com 3C920 Integrated Fast Ethernet
Controller (3C905C-TX Compatible)
Physical Address. . . . . . . . . : 00-B0-D0-74-A8-A4
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.1.2
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.30.254
DNS Servers . . . . . . . . . . . : 192.168.20.1
192.168.25.1
192.168.30.1
Primary WINS Server . . . . . . . : 192.168.30.254
Secondary WINS Server . . . . . . : 192.168.30.253
Lease Obtained. . . . . . . . . . : Saturday, February 02, 2002 12:03:14
PM
Lease Expires . . . . . . . . . . : Sunday, February 03, 2002 12:03:14 PM

C:\>

Notice that this gives you allsorts of networking information, including your IP, Gateway, MAC Address, DNS server and Host Name.

Linux/Unix:

Use the "ifconfig" command to find the IP of the box.

bash-2.04$ /sbin/ifconfig
eth0 Link encap:Ethernet HWaddr 00:C0:F0:31:9F:10
inet addr:192.168.1.3 Bcast:192.168.31.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:21353979 errors:2 dropped:0 overruns:0 frame:2
TX packets:20342701 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
Interrupt:11 Base address:0xde00

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:2234607 errors:0 dropped:0 overruns:0 frame:0
TX packets:2234607 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0

bash-2.04$

If you are SSH/telneting to the box and you want to find the IP you are attaching from use the "finger" command with no parameters.

bash-2.04$ finger
Login Name Tty Idle Login Time Office Office Phone
adrian Adrian Crenshaw pts/3 Feb 2 14:57 (192.168.1.2)
root root pts/0 1:53 Jan 28 17:25 (tux:2)
root root pts/1 4d Jan 25 14:57
root root pts/2 8d Jan 25 14:57 (tux:2)
bash-2.04$

All OSes:

    The IP found using the instructions above is the IP your computers NIC (Network Interface Card) or modem has, if you are hooked to a home router or some other kind of NAT box the IP the world sees as you when you connect to other hosts will be different. To find you WAN IP (the IP the world sees when you are behind a NAT box or a Proxy) go to one of the following sites:

            http://www.rootsecure.net/?p=your_ip
            http://www.ipchicken.com/
            http://www.whatismyip.com/
            http://checkip.dyndns.org/

and for some real fun, check out:

            http://www.moanmyip.com/

How do I find out if an IP is contactable?

If the host is not blocking ICMP echo requests (type 8, code 0) try using the "ping" command, it should work from any Unix like OS and from Windows.

UP:

C:\>ping 192.168.1.3

Pinging 192.168.1.3 with 32 bytes of data:

Reply from 192.168.1.3: bytes=32 time<10ms TTL=255
Reply from 192.168.1.3: bytes=32 time<10ms TTL=255
Reply from 192.168.1.3: bytes=32 time<10ms TTL=255
Reply from 192.168.1.3: bytes=32 time<10ms TTL=255

Ping statistics for 192.168.1.3:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms

C:\>

 Not Up

C:\>ping 192.168.30.133

Pinging 192.168.30.133 with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 192.168.30.133:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms

C:\>

If the host is behind a firewall blocking ICMP echo requests then you will have to look into other ways of enumerating the network, like Hping ( http://www.hping.org/ )

How do I find out what organization owns an IP?

Easiest way is to use the online tools from http://samspade.org/t/  (use IP Whois) or download their Windows tools and use them on your box. Arwin offers a similar CGI at http://ws.arin.net/cgi-bin/whois.pl if Sam Spade does not work for you. There is also a host of tools built into the SamSpade utility for Windows, which you can download from http://www.samspade.org/ssw/ .

How do I find out what OS a box is running?

You can tell what OS a box is running in a few ways. Knowing what ports are open on the box will give you some good guesses (for instance port 6000 is used for X-windows, it being open probably means the box is running some kind of Unix). The easiest way to find this info is to use the "nmap" utility from http://www.insecure.org/nmap/  ( also available on the Knoppix Linux Boot CD ( http://www.knoppix.org/ ) or Trinux boot disk ( http://sourceforge.net/projects/trinux/ ) ) and do an OS fingerprint like so:

[root@tux adrian]# nmap -O tux.mydomains.com

Starting nmap V. 2.54BETA26 ( www.insecure.org/nmap/ )
Adding open port 22/tcp
Adding open port 1024/tcp
Adding open port 25/tcp
Adding open port 80/tcp
Adding open port 110/tcp
Adding open port 993/tcp
Adding open port 6002/tcp
Adding open port 5902/tcp
Adding open port 111/tcp
Adding open port 443/tcp
Adding open port 21/tcp
Adding open port 995/tcp
Adding open port 23/tcp
Adding open port 143/tcp
Adding open port 139/tcp
Adding open port 515/tcp
Interesting ports on tux.mydomains.com (192.168.1.3):
(The 1532 ports scanned but not shown below are in state: closed)
Port State Service
21/tcp open ftp
22/tcp open ssh
23/tcp open telnet
25/tcp open smtp
80/tcp open http
110/tcp open pop-3
111/tcp open sunrpc
139/tcp open netbios-ssn
143/tcp open imap2
443/tcp open https
515/tcp open printer
993/tcp open imaps
995/tcp open pop3s
1024/tcp open kdm
5902/tcp open vnc-2
6002/tcp open X11:2

Remote operating system guess:
Linux Kernel 2.4.0 - 2.4.5 (X86)
Uptime 9.033 days (since Fri Jan 25 14:55:20 2002)

Nmap run completed -- 1 IP address (1 host up) scanned in 2 seconds
[root@tux adrian]#

Notice the part in red indicate the likely OS. Be careful about using tools like "nmap", the site you are targeting may give your local admin a call asking why you are scanning their site. Also make sure your copy of Nmap is up to date so it has the newest OS fingerprints, the version I used in the above example is kind of old.

You can also find out sometimes by using the "What's that site running" cgi at Netcraft, which does a banner grab for you.

Telneting to the host and observing the intro may give you some info: 

Red Hat Linux release 7.1 (Seawolf)
Kernel 2.4.2-2 on an i686
login:

and if they only have port 80 open you can telnet to that port and hit enter twice and observe the headers:

[root@tux adrian]# telnet orangutan.mydomains.com 80
Trying 192.168.28.32...
Connected to orangutan.mydomains.com.
Escape character is '^]'.


HTTP/1.1 400 Bad Request
Server: Microsoft-IIS/5.0
Date: Sun, 03 Feb 2002 20:51:47 GMT
Content-Type: text/html
Content-Length: 87

<html><head><title>Error</title></head><body>The parameter is incorrect. </body>
</html>Connection closed by foreign host.
[root@tux adrian]#

This technique is know as "banner grabbing".

How do I find out what ports are open/services are running?

There are port scanners for Windows and Unix, "nmap" (  http://www.insecure.org/nmap/ and available on the Trinux boot disk) being my personal choice. Be careful about using tools like "nmap", the site you are targeting may give your local admin a call asking why you are scanning their site. See the above entry for an example of using nmap. 

If you want to find out what ports are open (and which executables they belong too) on your local Windows box use the "netstat" command with the -b option.

Windows:

C:\>netstat -b

Active Connections

Proto Local Address Foreign Address State PID
TCP cthulhu:912 localhost:3659 ESTABLISHED 452
[vmware-authd.exe]

TCP cthulhu:912 localhost:3658 ESTABLISHED 452
[vmware-authd.exe]

TCP cthulhu:912 localhost:3640 ESTABLISHED 452
[vmware-authd.exe]

TCP cthulhu:912 localhost:3657 ESTABLISHED 452
[vmware-authd.exe]

TCP cthulhu:1059 localhost:9051 ESTABLISHED 3760
[vidalia.exe]

TCP cthulhu:1074 localhost:1075 ESTABLISHED 2988
[firefox.exe]

TCP cthulhu:1075 localhost:1074 ESTABLISHED 2988
[firefox.exe]

TCP cthulhu:1102 localhost:1103 ESTABLISHED 2988
[firefox.exe]

TCP cthulhu:1103 localhost:1102 ESTABLISHED 2988
[firefox.exe]

TCP cthulhu:3640 localhost:912 ESTABLISHED 2576
[vmware.exe]

TCP cthulhu:3657 localhost:912 ESTABLISHED 904
[vmware-vmx.exe]

TCP cthulhu:3658 localhost:912 ESTABLISHED 808
[vmserverdWin32.exe]

TCP cthulhu:3659 localhost:912 ESTABLISHED 2576
[vmware.exe]

TCP cthulhu:9051 localhost:1059 ESTABLISHED 2728
[tor.exe]

TCP cthulhu:3877 192.168.1.13:microsoft-ds ESTABLISHED 4
[System]

TCP cthulhu:3884 basic-linus.lankershim.dreamhost.com:22 ESTABLI
SHED 3792
[fzsftp.exe]

TCP cthulhu:3953 wx-in-f83.google.com:https ESTABLISHED 2988

[firefox.exe]

TCP cthulhu:3655 a72-247-130-52.deploy.akamaitechnologies.com:htt
p CLOSE_WAIT 2576
[vmware.exe]

C:\>

You can also use a tool like Fport ( http://www.foundstone.com ):

C:\>fport
FPort v2.0 - TCP/IP Process to Port Mapper
Copyright 2000 by Foundstone, Inc.
http://www.foundstone.com

Pid Process Port Proto Path
1572 inetinfo -> 25 TCP C:\WINDOWS\System32\inetsrv\inetinfo.exe
1572 inetinfo -> 80 TCP C:\WINDOWS\System32\inetsrv\inetinfo.exe
1008 svchost -> 135 TCP C:\WINDOWS\system32\svchost.exe
4 System -> 139 TCP
1572 inetinfo -> 443 TCP C:\WINDOWS\System32\inetsrv\inetinfo.exe
4 System -> 445 TCP
1108 svchost -> 1025 TCP C:\WINDOWS\System32\svchost.exe
1572 inetinfo -> 1043 TCP C:\WINDOWS\System32\inetsrv\inetinfo.exe
776 winlogon -> 1056 TCP \??\C:\WINDOWS\system32\winlogon.exe
4 System -> 1135 TCP
2436 OUTLOOK -> 1162 TCP C:\Program Files\Microsoft Office\OFFICE11\OUTLOOK.EXE
4 System -> 1169 TCP
2436 OUTLOOK -> 1176 TCP C:\Program Files\Microsoft Office\OFFICE11\OUTLOOK.EXE
1232 firefox -> 1219 TCP C:\Program Files\Mozilla Firefox\firefox.exe
1232 firefox -> 1220 TCP C:\Program Files\Mozilla Firefox\firefox.exe
2436 OUTLOOK -> 1221 TCP C:\Program Files\Microsoft Office\OFFICE11\OUTLOOK.EXE
4 System -> 1390 TCP
4 System -> 1451 TCP
4 System -> 1456 TCP
1232 firefox -> 1602 TCP C:\Program Files\Mozilla Firefox\firefox.exe
4 System -> 1634 TCP
0 System -> 1635 TCP
1108 svchost -> 3389 TCP C:\WINDOWS\System32\svchost.exe
1296 -> 5000 TCP
264 WCESCOMM -> 5679 TCP C:\Program Files\Microsoft ActiveSync\WCESCOMM.EXE

1572 inetinfo -> 135 UDP C:\WINDOWS\System32\inetsrv\inetinfo.exe
2436 OUTLOOK -> 137 UDP C:\Program Files\Microsoft Office\OFFICE11\OUTLOOK.EXE
4 System -> 138 UDP
1572 inetinfo -> 445 UDP C:\WINDOWS\System32\inetsrv\inetinfo.exe
1008 svchost -> 500 UDP C:\WINDOWS\system32\svchost.exe
1572 inetinfo -> 1026 UDP C:\WINDOWS\System32\inetsrv\inetinfo.exe
4 System -> 1027 UDP
1108 svchost -> 1028 UDP C:\WINDOWS\System32\svchost.exe
1572 inetinfo -> 1049 UDP C:\WINDOWS\System32\inetsrv\inetinfo.exe
776 winlogon -> 1051 UDP \??\C:\WINDOWS\system32\winlogon.exe
4 System -> 1165 UDP
2436 OUTLOOK -> 1558 UDP C:\Program Files\Microsoft Office\OFFICE11\OUTLOOK.EXE
4 System -> 1900 UDP
1232 firefox -> 1900 UDP C:\Program Files\Mozilla Firefox\firefox.exe
2436 OUTLOOK -> 2967 UDP C:\Program Files\Microsoft Office\OFFICE11\OUTLOOK.EXE
4 System -> 3456 UDP


C:\>

Or Netport:

C:\>netport
NetPort v1.1 - A Visual Log Product
Copyright 2004 by Softgears Company
http://www.softgears.com


Pid Process Port Proto Foreign Address Path
1572 inetinfo 25 TCP: LISTENING C:\WINDOWS\System32\inetsrv\inetinfo.exe
1572 inetinfo 80 TCP: LISTENING C:\WINDOWS\System32\inetsrv\inetinfo.exe
1008 svchost 135 TCP: LISTENING C:\WINDOWS\system32\svchost.exe
1572 inetinfo 443 TCP: LISTENING C:\WINDOWS\System32\inetsrv\inetinfo.exe
4 System 445 TCP: LISTENING
1108 svchost 1025 TCP: LISTENING C:\WINDOWS\System32\svchost.exe
1572 inetinfo 1043 TCP: LISTENING C:\WINDOWS\System32\inetsrv\inetinfo.exe
776 winlogon 1056 TCP: LISTENING \??\C:\WINDOWS\system32\winlogon.exe
4 System 1135 TCP: LISTENING
2436 OUTLOOK 1162 TCP: LISTENING C:\Program Files\Microsoft Office\OFFICE11\OUTLOOK.EXE
4 System 1169 TCP: LISTENING
2436 OUTLOOK 1176 TCP: LISTENING C:\Program Files\Microsoft Office\OFFICE11\OUTLOOK.EXE
1232 firefox 1220 TCP: LISTENING C:\Program Files\Mozilla Firefox\firefox.exe
2436 OUTLOOK 1221 TCP: LISTENING C:\Program Files\Microsoft Office\OFFICE11\OUTLOOK.EXE
4 System 1451 TCP: LISTENING
4 System 1456 TCP: LISTENING
1232 firefox 1602 TCP: LISTENING C:\Program Files\Mozilla Firefox\firefox.exe
1108 svchost 3389 TCP: LISTENING C:\WINDOWS\System32\svchost.exe
1296 System 5000 TCP: LISTENING
264 WCESCOMM 5679 TCP: LISTENING C:\Program Files\Microsoft ActiveSync\WCESCOMM.EXE
1232 firefox 1219 TCP: LISTENING C:\Program Files\Mozilla Firefox\firefox.exe
1232 firefox 1219 TCP: ESTABLISHED 127.0.0.1:1220 C:\Program Files\Mozilla Firefox\firefox.exe
1232 firefox 1220 TCP: ESTABLISHED 127.0.0.1:1219 C:\Program Files\Mozilla Firefox\firefox.exe
4 System 139 TCP: LISTENING
776 winlogon 1056 TCP: CLOSE_WAIT 134.68.220.157:389 \??\C:\WINDOWS\system32\winlogon.exe
2436 OUTLOOK 1162 TCP: ESTABLISHED 134.68.220.155:1025 C:\Program Files\Microsoft Office\OFFICE11\OUTLOOK.EXE
4 System 1169 TCP: ESTABLISHED 192.168.28.33:445
2436 OUTLOOK 1176 TCP: ESTABLISHED 129.79.1.40:1222 C:\Program Files\Microsoft Office\OFFICE11\OUTLOOK.EXE
2436 OUTLOOK 1221 TCP: ESTABLISHED 129.79.1.214:1249 C:\Program Files\Microsoft Office\OFFICE11\OUTLOOK.EXE
4 System 1390 TCP: LISTENING
4 System 1390 TCP: ESTABLISHED 192.168.30.154:139
4 System 1456 TCP: ESTABLISHED 129.79.6.3:445
1232 firefox 1602 TCP: ESTABLISHED 64.233.167.104:80 C:\Program Files\Mozilla Firefox\firefox.exe
4 System 1634 TCP: LISTENING
4 System 1634 TCP: ESTABLISHED 192.168.30.34:139
1008 svchost 135 UDP: LISTENING C:\WINDOWS\system32\svchost.exe
4 System 445 UDP: LISTENING
836 lsass 500 UDP: LISTENING C:\WINDOWS\system32\lsass.exe
1264 System 1026 UDP: LISTENING
1264 System 1027 UDP: LISTENING
836 lsass 1028 UDP: LISTENING C:\WINDOWS\system32\lsass.exe
1572 inetinfo 1049 UDP: LISTENING C:\WINDOWS\System32\inetsrv\inetinfo.exe
776 winlogon 1051 UDP: LISTENING \??\C:\WINDOWS\system32\winlogon.exe
2436 OUTLOOK 1165 UDP: LISTENING C:\Program Files\Microsoft Office\OFFICE11\OUTLOOK.EXE
1640 Rtvscan 2967 UDP: LISTENING C:\Program Files\Symantec_Client_Security\Symantec AntiVirus\Rtvscan.exe
1572 inetinfo 3456 UDP: LISTENING C:\WINDOWS\System32\inetsrv\inetinfo.exe
4064 FRONTPG 1558 UDP: LISTENING C:\PROGRA~1\MICROS~2\Office10\FRONTPG.EXE
1296 System 1900 UDP: LISTENING
4 System 137 UDP: LISTENING
4 System 138 UDP: LISTENING
1296 System 1900 UDP: LISTENING


C:\>

Linux/*nix:

    Use the "lsof -i" command:

[root@balrog root]# lsof -i
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
dhclient 467 root 4u IPv4 777 UDP *:bootpc
portmap 533 rpc 3u IPv4 898 UDP *:sunrpc
portmap 533 rpc 4u IPv4 901 TCP *:sunrpc (LISTEN)
rpc.statd 552 rpcuser 4u IPv4 972 UDP *:32768
rpc.statd 552 rpcuser 5u IPv4 939 UDP *:728
rpc.statd 552 rpcuser 6u IPv4 975 TCP *:32768 (LISTEN)
sshd 642 root 3u IPv4 1287 TCP *:ssh (LISTEN)
xinetd 657 root 5u IPv4 1313 TCP localhost.localdomain:32769 (LISTEN)
sendmail 682 root 4u IPv4 1377 TCP localhost.localdomain:smtp (LISTEN)
httpd 712 root 3u IPv4 1422 TCP *:http (LISTEN)
httpd 712 root 4u IPv4 1423 TCP *:https (LISTEN)
sshd 8498 root 4u IPv4 323188 TCP balrog.irongeek.com:ssh->winxpe:1644 (ESTABLISHED)
httpd 31094 apache 3u IPv4 1422 TCP *:http (LISTEN)
httpd 31094 apache 4u IPv4 1423 TCP *:https (LISTEN)
httpd 31095 apache 3u IPv4 1422 TCP *:http (LISTEN)
httpd 31095 apache 4u IPv4 1423 TCP *:https (LISTEN)
httpd 31096 apache 3u IPv4 1422 TCP *:http (LISTEN)
httpd 31096 apache 4u IPv4 1423 TCP *:https (LISTEN)
httpd 31097 apache 3u IPv4 1422 TCP *:http (LISTEN)
httpd 31097 apache 4u IPv4 1423 TCP *:https (LISTEN)
httpd 31098 apache 3u IPv4 1422 TCP *:http (LISTEN)
httpd 31098 apache 4u IPv4 1423 TCP *:https (LISTEN)
httpd 31099 apache 3u IPv4 1422 TCP *:http (LISTEN)
httpd 31099 apache 4u IPv4 1423 TCP *:https (LISTEN)
httpd 31100 apache 3u IPv4 1422 TCP *:http (LISTEN)
httpd 31100 apache 4u IPv4 1423 TCP *:https (LISTEN)
httpd 31101 apache 3u IPv4 1422 TCP *:http (LISTEN)
httpd 31101 apache 4u IPv4 1423 TCP *:https (LISTEN)
[root@balrog root]#

How do I tell who is logged into a remote Windows box?

On Windows you can try:

C:\>nbtstat -a somebox
Local Area Connection:
Node IpAddress: [192.168.22.68] Scope Id: []
           NetBIOS Remote Machine Name Table
       Name               Type         Status
    ---------------------------------------------
    testbox2<00>  UNIQUE	       Registered
    MYADS         <00>  GROUP          Registered
    testbox2<03>  UNIQUE               Registered
    MYADS        <1E>  GROUP           Registered
    JDOE      03>  UNIQUE    Registered

    MAC Address = 00-04-76-39-A9-F9
C:\>
But if Netbios over TCP/IP it turned off it won't work. 
In that case you may have to use a WMI script, but you would have to be an Admin on the remote box.
On Unix:

bash-2.05# nmblookup -S somebox
querying testbox2 on 192.168.31.255
192.168.22.59 somebox <00>
Looking up status of 192.168.22.59
testbox2	<00> - M <ACTIVE>
MYADS		<00> - <GROUP> M <ACTIVE>
testbox2 	<03> - M <ACTIVE>
MYADS 		<1e> - <GROUP> M <ACTIVE>
JDOE 		<03> - M <ACTIVE>

bash-2.05#
The above will only work is the Windows box has Netbios over TCP/IP it turned on. 

Any good all in one tools?

LANguard (for Windows) and Nessus (for Unix). With all these you would want to turn off some of the options, otherwise the admins at the other site will see is as an all out attack. 

How Do I find the NetBIOS name from the IP?

On Windows:

C:\>nbtstat -a 192.168.22.68

Local Area Connection:
Node IpAddress: [192.168.22.68] Scope Id: []

           NetBIOS Remote Machine Name Table

       Name               Type         Status
    ---------------------------------------------
    testbox3	<00>  UNIQUE      Registered
    MYADS       <00>  GROUP       Registered
    testbox3	<03>  UNIQUE      Registered
    testbox3	<20>  UNIQUE      Registered
    MYADS       <1E>  GROUP       Registered
    ADRIAN      <03>  UNIQUE      Registered


    MAC Address = 00-04-76-39-B6-D9

C:\>
On Unix (if you have nbtstat installed):
[root@tux /root]# nbtstat 192.168.22.68
received data:
A2 48 84 00 00 00 00 01 00 00 00 00 20 43 4B 41  .H.......... CKA
41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41  AAAAAAAAAAAAAAAA
41 41 41 41 41 41 41 41 41 41 41 41 41 00 00 21  AAAAAAAAAAAAA..!
00 01 00 00 00 00 00 9B 06 53 45 2D 53 53 43 53  .........SSCS
2D 43 56 31 31 32 43 38 00 44 00 41 44 53 20 20  -CV112C8.D.MYADS
20 20 20 20 20 20 20 20 20 20 00 C4 00 53 45 2D            ...
53 53 43 53 2D 43 56 31 31 32 43 38 03 44 00 53  testbox3.D.S
45 2D 53 53 43 53 2D 43 56 31 31 32 43 38 20 44  E-testbox3 D
00 41 44 53 20 20 20 20 20 20 20 20 20 20 20 20  .MYADS
1E C4 00 41 44 52 49 41 4E 20 20 20 20 20 20 20  ...ADRIAN
20 20 03 44 00 00 04 76 39 B6 D9 00 00 00 00 00    .D...v9.......
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00 00 00 00 8C                                   .....
6 names in response
 testbox3<0x00> Unique  Workstation Service
 MYADS            <0x00> Group   Domain Name
 testbox3<0x03> Unique  Messenger Service
 testbox3<0x20> Unique  File Server Service
 MYADS            <0x1e> Group   Potential Master Browser
 ADRIAN         <0x03> Unique  Messenger Service
[root@tux /root]# 

How Do I find the IP from the NetBIOS name?

On Windows:

C:\>nbtstat -a testbox3

Local Area Connection:
Node IpAddress: [
192.168.22.68] Scope Id: []

           NetBIOS Remote Machine Name Table

       Name               Type         Status
    ---------------------------------------------
    testbox3<00>  UNIQUE      Registered
    MYADS            <00>  GROUP       Registered
    testbox3<03>  UNIQUE      Registered
    testbox3<20>  UNIQUE      Registered
    MYADS            <1E>  GROUP       Registered
    ADRIAN         <03>  UNIQUE      Registered

    MAC Address = 00-04-76-39-B6-D9
C:\>

On Unix:

[root@tux /root]# nmblookup testbox3
querying testbox3 on 192.168.31.255
192.168.22.68 testbox3<00>
[root@tux /root]#

How can I see the traffic going between two points on a switched network?

Get the dsniff and ngrep packages, they come with Trinux (note: on Trinux use "arpredirect" instead of "arpspoof") or you can download them. Start up three terminals.

In the first terminal run :

arpspoof   -t   1.1.1.1   2.2.2.2

In the 2nd one run :

arpspoof   -t   2.2.2.2   1.1.1.1

Then run ngrep:

ngrep host 1.1.1.1|more

and watch the fun. Also try the "dsniff" command to see plaintext passwords that are passed between the two hosts. To find out more information visit my article on the basics of ARP spoofing at http://irongeek.com/i.php?page=security/arpspoof

You can also use Ettercap (Win and Linux) and Cain (Win) to do much the same thing as these videos illustrate:

Fun with Ettercap Filters: The Movie

Cain to ARP poison and sniff passwords

and also check out my article titled A Quick Intro to Sniffers.

 

Change Log:
09/03/2004: First published
10/10/2007: Added "Moan My IP", the -b option to Netstat and linked to the videos for Cain and Ettercap and the article A Quick Intro to Sniffers.

 

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