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- Last Review: July 29, 2013

Home > NetScanTools Pro > Technical Details > DHCP Discovery Tool

DHCP Discovery Tool Description - Detect DHCP Servers and Show What They are Offering.

About the DHCP Server Discovery Tool

The NetScanTools Pro DHCP Server Discovery tool detects IPv4 Dynamic Host Configuration Protocol (DHCP or DHCPv4) servers on each of your local network subnets. It shows all responding DHCP servers both legitimate and servers that are not supposed to be on your network (sometimes called rogue DHCP servers). It can find DHCP servers on every network segment attached through one or more network interfaces.

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Version 11 DHCP Discovery Tool Slideshow

Important Notes:

  • This tool discovers DHCP Servers on local network segments (subnets) connected to each network interface.

  • Currently IPv4 only.

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Purpose of the DHCP Server Discovery Tool:

  • The purpose of this tool is to help you find IPV4 DHCP Servers on each of your network interfaces and see the information they are offering in response to a DHCP_DISCOVER query. You can specify which network interface you want to use to detect DHCP servers. It works with both wired and wireless 802.11 interfaces.

Tool Capabilities

The fields the tool can decode and display from a DHCP_OFFER packet are shown in this table:

DHCP Server IP Address DHCP Server Hostname Offered IP Address
Offered Subnet Mask IP Address Lease Time Renewal Time
Rebinding Time Domain Name DNS IP Address
Router IP Address NTP Server IP Address  

The option requests shown in bold can be turned on or off. The MAC address of the sending interface is used when sending a DHCP_DISCOVER broadcast packet to DHCP servers.

A video of the DHCP Discover Tool

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