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Questions tagged [nmap]

Nmap (Network Mapper) is a security scanner originally written by Gordon Lyon (also known by his pseudonym Fyodor Vaskovich) used to discover hosts and services on a computer network, thus creating a "map" of the network.

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Port Scanning Large Sets of Targets

1)How would you check to see if a list of ~10000 IPs if they have port 80 open? 2)How would you go about the same scenario but with a port range? 3)How would you check a list of 10000 IPs to see which of their ports is open?
Mona Jalal
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"Nmap Scripting Engine" HTTP Requests

I looked into my nginx access logs to check who accessed my server and I noticed this line: - - [25/Feb/2016:02:49:12 +0100] "GET / HTTP/1.1" 302 160 "-" "Mozilla/5.0 (compatible; Nmap Scripting Engine; http://nmap.org/book/nse.html)" I use…
PatrickMA
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nmap silent with specific installation directory

Anyone have try to do the installation? it always install to c:\program files\WinPcap directory regardless of the parameter winpcap-nmap-4.02.exe /S /D="C:\tools\WinPcap\" http://seclists.org/nmap-dev/2008/q2/834
Francis
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getting a list of live assets using nmap and script?

I'm playing around with a way to find all network assets from the command line that will return an IP, a hostname, and then have a way to see all interfaces associated with that host. I was using something like: nmap -sP 10.40.. | grep 'is up' |…
networkScan
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Azure NAT blocking connections

When I try to connect to a port on the public IP address of a node, 50% of the time Azure doesn't respond and nmap marks it as "filtered". When I try to connect to the same port from the node using localhost, it works 100% of the time. I see this…
Charles Offenbacher
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"Filtered" port when accessing server

I'm having periodic trouble accessing one of my DigitalOcean servers from Azure machines. I have isolated a test that - I believe - demonstrates the issue and captured a tcpdump from the server for both the working example and the not working…
Charles Offenbacher
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Why nmap result is different from online port scanner result?

I have a vps A, and I am running smtp on it. If I run nmap from my local desktop to scan for my vps it turns out that port 25 (smtp) is filtered. However, if I run online scanner (fill my vps's IP into the web site and let the web site run a scan),…
Nevermoe
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NMAP not mapping DOWN status

I used this command from another post and the file scan.txt only shows the servers with UP status. The listing should also show down status of IP. Is there a switch for that? nmap -sn -PE -oG scan.txt 192.168.1.1 192.168.2.0/24 Any IP that is down…
Ken P11
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NMAP port scanning - inconsistent results

I ran the same nmap commands subsequently, and got two sets of results. I know that there are three open ports, but on each run, only two are shown. Can anyone explain these results? ramses@deimos:~/$ nmap -p 50000-60000 some-server Starting Nmap…
Ramses
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Inconsistent nmap scan results

I'm working on a program that depends on scanning the local network for all connected devices and getting their MAC address. To do this, I'm running the following command: nmap -sn 10.0.0.* This is working for the most part. The issue I'm having is…
Sam
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nmap unable to split netmask from target expression

I'm trying to scan my website with nmap to see what is visible from outside...but nmap returns this value... Starting Nmap 6.47 ( http://nmap.org ) at 2015-05-06 01:06 PDT Unable to split netmask from target expression: "https://website" WARNING: No…
user287457
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Why is port 443 (but not port 80) being exposed to nmap when iptables is configured to drop the traffic?

A Debian box is running web services on ports 80 and 443 and iptables is configured to allow web traffic only from white listed ip addresses. A second Debian box (that is not white listed) is using nmap to run a port scan against the web server and…
Monica For CEO
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Unknown device showing up in network scan

I need some help finding a device that has been showing up whenever I scan my network using Spiceworks' "Inventory" scan. I can ping the device, but nslookup returns a non-existent domain, and Spiceworks is telling me that the device has no open…
zomgdavidbowie
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outlook doing remote portscanning

A while ago I switched my mailbox on another domain and configured outlook with an exchange server on that domain. Recently for some strange reason my hosting provider has been complaining that outlook runs regular portscans on his servers…
Zipporobotics
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ACL Rule to Open UDP Ports

I have the current rules in an attempt to open port 5060 and 10000-20000 for my VoIP provider. We are on a Cisco 1921 router. This ACL is applied to the WAN port on the router facing the ISP. Nmap port scan shows these ports as closed. Can…
Kev
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