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Home > Success Center > IP Address Manager (IPAM) > Merge multiple DHCP scopes into single subnet

Merge multiple DHCP scopes into single subnet

Created by Brian O'Donovan, last modified by MindTouch on Jun 23, 2016

Views: 1,208 Votes: 0 Revisions: 7


This article describes how you can merge multiple DHCP scopes into a signle subnet. 

When adding the scopes to IPAM there is a subnet created for each scope on each DHCP server.

For example:

2 DHCP servers, each with identical scopes called "Scope_1"

When adding the scopes to IPAM there are 2 subnets created called "SCOPE_1"


*Please note that if one of the DHCP servers are for High Availability/Failover that all addresses in the scope will not pull in correct info such as Scope Names. The Scope names and all other info for the failover server will be incomplete because IPAM does not support failover or High Availability. You may also see addresses get pulled in as duplicate but with not all correct mac info and so forth.


All versions of IPAM.


This issue occurs because the Enable Duplicate Subnets is enabled.


  1. Disable the Enable Duplicate Subnets by going to Settings > IPAM Settings.
  2. Click System Settings, and uncheck Enable Duplicate Subnets.
  3. Save.

If the scopes that are to be merged are already in IPAM please do the following.

  1. Remove the Subnet from IPAM
  2. Remove the Scopes from IPAM
  3. Re-add the Scopes this will create a new subnet containing the split scopes






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