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.
Questions tagged [nmap]
255 questions
-1
votes
1 answer
How to find device names on local network?
Currently I'm trying to write a Python script to scan through my local network, and list all of the active IP addresses, and their corresponding MAC address and device name. Also all of the devices connected to my network are wireless devices.
For…
fancyshark
- 5
- 3
-1
votes
1 answer
List all active devices in different subnets?
My company has a class A network that contains various subnets. I need to automate a way to produce a list of all online devices (in all the subnets). To start, just a list of responsive private IPs would be great.
I like using arp-scan which is…
Andrew Campi
- 11
-1
votes
1 answer
How to get OS and version of every server on network?
This is a case of "we are where we are". I'm a developer and I've been asked to get a list of every server on our network (IP and hostname) along with the OS version
We exclusively use Windows machines.
My first instinct was to use nmap but I'm…
pee2pee
- 369
- 1
- 5
- 12
-1
votes
1 answer
firewalld causing nmap to return host seems down
I've two machines, server1 and server2. On server2, I stop firewalld.
[root@server2 ~]# systemctl stop firewalld
From server1, nmap returns Host is up.
[root@server1 ~]$ nmap -sn server2
Starting Nmap 6.40 ( http://nmap.org ) at 2020-09-02 11:27…
JeremyCanfield
- 413
- 4
- 11
- 17
-2
votes
1 answer
Hostname and Operating System - what is the best way to do the scan?
Is it possible to run an Nmap scan that give the output for Operating system and the hostname?
If so what are the flags that needs to be used?
Alvin Alvin
- 1
- 1
- 1
-2
votes
1 answer
Nmap takes forever when pinging ports
When I execute nmap -sn 192.168.1.0/24, it takes 12 seconds to find 256 hosts but when I execute nmap -sS 192.168.1.0/24, it takes forever. Why is this happening?
I cannot see what I did wrong. Maybe I wrote my address wrong or something. I am…
Andrei Marin
- 1
- 1
-2
votes
1 answer
cant scan and ping my ip from outside
when I scan my network using nmap it gives me something like this
#nmap -vv -Pn -sV -sT -p80 -oG - 116.135.*.*
# Ports scanned: TCP(1;80) UDP(0;) SCTP(0;) PROTOCOLS(0;)
Host: 116.135.*.* () Status: Up
Host: 116.135.*.* () Ports:…
Fxc3dC
- 11
-2
votes
1 answer
I have a IP address with some open services. How could I contact the owner?
After having serious problems (DNS incident) I found out an IP address of a machine. Is it in any way possible to contact the owner without knowing anything else like email, domain name or website? I scanned it via nmap and found some services…
brubaker
- 11
- 1
-2
votes
2 answers
Can a regular zenmap scan disrupt my network or servers?
I'm trying to increase the security on our servers but I need verification that the Information Gathering tool ZenMap or NMap does not disrupt our network while it's scanning the network.
Are there any settings to be very caucious off which might…
Rob
- 147
- 1
- 5
- 17
-2
votes
2 answers
Ports do not open after rules appended in iptables
I have a server that I am trying to setup for OpenVPN. I have followed all the steps, but I see that when I try to connect to it in Windows, it doesn't allow me, it just hangs on connecting, so I did a nmap scan and I see that port 1194 is not open…
user2699451
- 7
- 2
- 3
-2
votes
2 answers
Nmap scans the host but cannot ping the host
My laptop is connected to a network where we have routers with filters. I can use nmap to scan alive hosts and I can see open ports (mostly port 80). But then, when I try to ping those hosts, I dont receive any data. Can anyone point out what the…
kevin
- 101
- 1
- 4
-2
votes
1 answer
how can I verify whether multiple ip addresses are hosting on same server?
Many hosting providers put multiple ip addresses on same physical machine. If I have two ip address, for example: 192.168.1.100 and 192.168.1.101. If I can only send probing packets from afar, how can I tell if these ip addresses are hosted on same…
Long Cheng
- 247
- 1
- 2
- 8
-2
votes
1 answer
How to discover HTTPS servers on local network with certificate for particular hostname
I am making a network-connected device (using Raspberry Pi 4 inside), and I would like a way for these devices to discover each other (when on the same local subnet). I am vaguely aware of protocols like SSDP / UPnP which can help with things like…
jacobq
- 132
- 4
-4
votes
1 answer
Difference between local and remote nmap - trying to set up mysql server remote access
I am try to set up mysql remotely. I have followed a number of guides such as this, and I have ended up using nmap to see what ports are open.
When I am on my laptop, nmap -P0 gives:
Nmap scan report for <> (ip.address.here)
Host is up…
k4kuz0
- 93
- 1
-4
votes
1 answer
ports I open with iptables appear closed
I opened the following ports with iptables on Debian 7:
iptables -X
iptables -F
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT ACCEPT
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -p tcp…
user3680708
- 1
- 2