CODEWITHSUNDEEP
nmap
k_plan
k_plan

Reputation: 121

What does /24 means in nmap scanning?

I have just started learning about the use of nmap and while doing so, I am unable to find much information on a particular command.

This is the command I am using: nmap -sP 192.168.100.0/24 to scan for the list of connected devices on the network.

While the ip address used is the subnet ip, I am having trouble understanding what /24 does.

Can someone kindly share any insights to me?

Upvotes: 4

Views: 7270

Answers (2)

nvt_dc
nvt_dc

Reputation: 125

/24 is the prefix length used to indicate the number of network bits of an IP address.

Refer this article from Cisco: https://www.cisco.com/c/en/us/support/docs/ip/routing-information-protocol-rip/13788-3.html

Also, before starting with nmap, you must have basic knowledge about computer networks to understand different types of scan.

Upvotes: 0

Chris Dodd
Chris Dodd

Reputation: 126448

/24 specifies the netmask to use -- 24 bits in this case, so a mask of 255.255.255.0. So it will scan all addresses from 192.168.100.0 to 192.168.100.255

Upvotes: 7

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