When dealing with large amounts of ping targets it is convenient to be able to add/remove them through PowerShell. This kb article contains a sample script for PowerShell (in conjunction with a DLL) to script all your ping targets in SCOM
You will need to download the zip containing the DLL here.
After the download unzip the files to for example C:\DevOpsPing\
Change the parameters in the PS script below and run the script on a MS server.
## Add/change/delete by script a Ping Host and Ping Target
# SCOM SDK SERVER
$RMS = "localhost"
# The Ping Source Host to use
$pingSourceHostName = "DEVOM2012SP1-01.contoso.com"
# The Ping Target to check
$pingTargetName = "172.16.10.1"
$pingTargetDisplayName = "Gateway"
# load the assemblies
# Connect to the Management Group
$managementGroup = Get-SCOMManagementGroup
# Create an instance of the ping class and load the management group
$PingObj = New-Object OpsLogix.IMP.Base.UI.PowershellPing
# Use the line below to add your ping source node
# Use the line below to add your ping target
# Use the line below to remove your ping target
# Uncomment below only if you want to delete the ping target