Does an intense scan without checking to see if targets are up first.

This can be useful when a target seems to ignore the usual host discovery probes.

sudo nmap -T4 -A -v -Pn 192.168.1.69

result:

Starting Nmap 6.40 ( http://nmap.org ) at 2016-07-08 01:54 BST
NSE: Loaded 110 scripts for scanning.
NSE: Script Pre-scanning.
Initiating Parallel DNS resolution of 1 host. at 01:54
Completed Parallel DNS resolution of 1 host. at 01:54, 0.00s elapsed
Initiating SYN Stealth Scan at 01:54
Scanning peter-laptop-1 (192.168.1.69) [1000 ports]
Discovered open port 80/tcp on 192.168.1.69
Discovered open port 445/tcp on 192.168.1.69
Discovered open port 139/tcp on 192.168.1.69
Completed SYN Stealth Scan at 01:54, 2.00s elapsed (1000 total ports)
Initiating Service scan at 01:54
Scanning 3 services on peter-laptop-1 (192.168.1.69)
Completed Service scan at 01:55, 11.01s elapsed (3 services on 1 host)
Initiating OS detection (try #1) against peter-laptop-1 (192.168.1.69)
Retrying OS detection (try #2) against peter-laptop-1 (192.168.1.69)
Retrying OS detection (try #3) against peter-laptop-1 (192.168.1.69)
Retrying OS detection (try #4) against peter-laptop-1 (192.168.1.69)
Retrying OS detection (try #5) against peter-laptop-1 (192.168.1.69)
NSE: Script scanning 192.168.1.69.
Initiating NSE at 01:55
Completed NSE at 01:55, 0.14s elapsed
Nmap scan report for peter-laptop-1 (192.168.1.69)
Host is up (0.0000080s latency).
Not shown: 997 closed ports
PORT    STATE SERVICE     VERSION
80/tcp  open  http        nginx 1.4.6 (Ubuntu)
|_http-methods: No Allow or Public header in OPTIONS response (status code 405)
|_http-title: Site doesn't have a title (text/html).
139/tcp open  netbios-ssn Samba smbd 3.X (workgroup: PETER-LAPTOP-1)
445/tcp open  netbios-ssn Samba smbd 3.X (workgroup: PETER-LAPTOP-1)
No exact OS matches for host (If you know what OS is running on it, see http://nmap.org/submit/ ).
TCP/IP fingerprint:
OS:SCAN(V=6.40%E=4%D=7/8%OT=80%CT=1%CU=44467%PV=Y%DS=0%DC=L%G=Y%TM=577EF9FD
OS:%P=x86_64-pc-linux-gnu)SEQ(SP=106%GCD=1%ISR=107%TI=Z%CI=I%TS=8)OPS(O1=MF
OS:FD7ST11NW7%O2=MFFD7ST11NW7%O3=MFFD7NNT11NW7%O4=MFFD7ST11NW7%O5=MFFD7ST11
OS:NW7%O6=MFFD7ST11)WIN(W1=AAAA%W2=AAAA%W3=AAAA%W4=AAAA%W5=AAAA%W6=AAAA)ECN
OS:(R=Y%DF=Y%T=40%W=AAAA%O=MFFD7NNSNW7%CC=Y%Q=)T1(R=Y%DF=Y%T=40%S=O%A=S+%F=
OS:AS%RD=0%Q=)T2(R=N)T3(R=N)T4(R=Y%DF=Y%T=40%W=0%S=A%A=Z%F=R%O=%RD=0%Q=)T5(
OS:R=Y%DF=Y%T=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)T6(R=Y%DF=Y%T=40%W=0%S=A%A=Z%
OS:F=R%O=%RD=0%Q=)T7(R=Y%DF=Y%T=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)U1(R=Y%DF=N
OS:%T=40%IPL=164%UN=0%RIPL=G%RID=G%RIPCK=G%RUCK=G%RUD=G)IE(R=Y%DFI=N%T=40%C
OS:D=S)
 
Uptime guess: 0.243 days (since Thu Jul  7 20:05:36 2016)
Network Distance: 0 hops
TCP Sequence Prediction: Difficulty=262 (Good luck!)
IP ID Sequence Generation: All zeros
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel
 
Host script results:
| nbstat: 
|   NetBIOS name: PETER-LAPTOP-1, NetBIOS user: <unknown>, NetBIOS MAC: <unknown>
|   Names
|     PETER-LAPTOP-1<00>   Flags: <unique><active>
|     PETER-LAPTOP-1<03>   Flags: <unique><active>
|     PETER-LAPTOP-1<20>   Flags: <unique><active>
|     \x01\x02__MSBROWSE__\x02<01>  Flags: <group><active>
|     WORKGROUP<00>        Flags: <group><active>
|     WORKGROUP<1d>        Flags: <unique><active>
|_    WORKGROUP<1e>        Flags: <group><active>
| smb-os-discovery: 
|   OS: Windows 6.1 (Samba 4.3.9-Ubuntu)
|   Computer name: peter-laptop-1
|   NetBIOS computer name: PETER-LAPTOP-1
|   Domain name: 
|   FQDN: peter-laptop-1
|_  System time: 2016-07-08T01:55:25+01:00
| smb-security-mode: 
|   Account that was used for smb scripts: guest
|   User-level authentication
|   SMB Security: Challenge/response passwords supported
|_  Message signing disabled (dangerous, but default)
|_smbv2-enabled: Server supports SMBv2 protocol
 
NSE: Script Post-scanning.
Read data files from: /usr/bin/../share/nmap
OS and Service detection performed. Please report any incorrect results at http://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 28.70 seconds
           Raw packets sent: 1275 (69.300KB) | Rcvd: 2599 (129.612KB)