nmap -p- -Pn -n 172.28.128.3

-p-: you can specify -p- to scan ports from 1 through 65535.

-Pn: Treat all hosts as online — skip host discovery

-n/-R: Never do DNS resolution/Always resolve [default: sometimes]

nmap -sV -T4 -p-65535 172.28.128.3

Adding the -sV option enables Nmap version detection, which is trained to look for these clues (among others).

-T4 prohibits the dynamic scan delay from exceeding 10 ms for TCP ports and -T5 caps that value at 5 ms.

-p-65535: scan all ports to 65535

Reference to values for T: T Table

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Netdiscover is a simple ARP scanner which can be used to scan for live hosts in a network.

Discover your network interface eth0 for range of 172.28.128.0/24::
netdiscover -i eth0 -r 172.28.128.0/24-i device: your network device

Options available:

  -r range: scan a given range instead of auto scan. 172.28.128.0/24,/16,/8
  -l file: scan the list of ranges contained into the given file
  -p passive mode: do not send anything, only sniff
  -m file: scan the list of known MACs and host names
  -F filter: Customize pcap filter expression (default: "arp")
  -s time: time to sleep between each arp request (miliseconds)
  -n node: last ip octet used for scanning (from 2 to 253)
  -c count: number of times to send each arp reques (for nets with packet loss)
  -f enable fastmode scan, saves a lot of time, recommended for auto
  -d ignore home config files for autoscan and fast mode
  -S enable sleep time supression betwen each request (hardcore mode)
  -P print results in a format suitable for parsing by another program
  -N Do not print header. Only valid when -P is enabled.
  -L in parsable output mode (-P), continue listening after the active scan is completed

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