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Thread: good ip scanner

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  1. #11
    Linux Engineer
    Join Date
    Mar 2005
    Where my hat is

    Better yet..

    man nmap
    Registered Linux user #384279
    Vector Linux SOHO 7

  2. #12
    no "nmap ip" will scan that ip for open ports. what i need is soemthing to ping each ip address of a range to find if they are responding or not

  3. #13
    Linux Engineer
    Join Date
    Mar 2005
    Where my hat is
    One.. More.. Time..

    man nmap
    Registered Linux user #384279
    Vector Linux SOHO 7

  4. $spacer_open
  5. #14
    ive read thing thru about 30 times, i use nmap all the time. the point is that nmap is a port scanner. a port scanner is one that sends an IP address different packages to test whether or not the recieving port is open. then we can also use it to determine what software is running on that port and a whole bunch of other stuff (ok ill stop there b4 i go into hacking). what i need is an IP scanner. an IP scanner will ping a list or range of different hosts to determine whether they are up or not. this allows a person to find other computers on the same network.

  6. #15
    Linux Engineer
    Join Date
    Mar 2005
    Where my hat is
    Everything that isn't an option (or option argument) in
    nmap is treated as a target host specification. The sim*
    plest case is listing single hostnames or IP addresses on
    the command line. If you want to scan a subnet of IP
    addresses, you can append /mask to the hostname or IP
    address. mask must be between 0 (scan the whole Internet)
    and 32 (scan the single host specified). Use /24 to scan
    a class "C" address and /16 for a class "B".

    Nmap also has a more powerful notation which lets you
    specify an IP address using lists/ranges for each element.
    Thus you can scan the whole class "B" network 192.168.*.*
    by specifying "192.168.*.*" or "192.168.0-255.0-255" or
    even "192.168.1-50,51-255.1,2,3,4,5-255". And of course
    you can use the mask notation: "". These
    are all equivalent. If you use asterisks ("*"), remember
    that most shells require you to escape them with back
    slashes or protect them with quotes.

    Another interesting thing to do is slice the Internet the
    other way. Instead of scanning all the hosts in a class
    "B", scan "*.*.5.6-7" to scan every IP address that ends
    in .5.6 or .5.7 Pick your own numbers. For more informa*
    tion on specifying hosts to scan, see the examples sec*

    -sP Ping scanning: Sometimes you only want to know
    which hosts on a network are up. Nmap can do this
    by sending ICMP echo request packets to every IP
    address on the networks you specify. Hosts that
    respond are up. Unfortunately, some sites such as block echo request packets. Thus
    nmap can also send a TCP ack packet to (by default)
    port 80. If we get an RST back, that machine is
    up. A third technique involves sending a SYN
    packet and waiting for a RST or a SYN/ACK. For
    non-root users, a connect() method is used.

    By default (for root users), nmap uses both the
    ICMP and ACK techniques in parallel. You can
    change the -P option described later.

    Note that pinging is done by default anyway, and
    only hosts that respond are scanned. Only use this
    option if you wish to ping sweep without doing any
    actual port scans.
    All the above information was from man nmap. Read it again.
    Registered Linux user #384279
    Vector Linux SOHO 7

  7. #16
    That's right.
    What do you think nmap does to determine if a host is up and available for guessed it...

    So all you do is leave out the portscanning with an option.
    You CAN scan ranges with Nmap, so here is your "ip scanner"

  8. #17
    wow. what version do u have. i just realized i had 1.7. i got the new one and now i found that in the man. thx

  9. #18
    U mean a ip range?

    like this :
    this example will scam ip addr from -

  10. #19
    Linux Guru anomie's Avatar
    Join Date
    Mar 2005
    As has been mentioned repeatedly, you want nmap. And has been mentioned repeatedly, now is as good a time as any to become acquainted with the man pages.

    If it's good enough for trinity...

  11. #20
    Linux Guru loft306's Avatar
    Join Date
    Oct 2003
    The DairyLand
    Quote Originally Posted by *DEAD*
    no i mean IP scanner.
    one where you punch in 2 ips and it scans for ips inbetween the two. its mainly a hackers tool but id like one for my network. angry IP scanners a good one for windows.
    where you used the term 'hackers' the real term to use there is crackers crackers break into systems hackers fix and run is the media that got it wrong!
    ~Mike ~~~ Forum Rules
    Testing? What's that? If it compiles, it is good, if it boots up, it is perfect. ~ Linus Torvalds

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