IPAM Subnet Monitoring
IPAM Subnet Monitoring
Track IP address usage across all subnets. Monitor available, used, reserved, and transient addresses alongside DNS and SNMP status from a single view.
Overview
Cloudmon's IP Address Management (IPAM) feature provides centralised tracking and monitoring of IP addresses and subnets across the network. Once a subnet is added and scanning is enabled, Cloudmon continuously polls the subnet and tracks which addresses are in use, which are available, and which are showing conflicts or transient activity. DNS and SNMP status are validated for each address, giving teams a complete picture of IP usage without needing to manage spreadsheets or query devices manually.
Navigate to Network → IPAM to access the IPAM dashboard, subnets, supernets, and discovered subnets.
Adding Subnets and Supernets
Navigate to Network → IPAM and select the + icon to add a subnet, supernet, or router.
Add Subnet
| Field | Description |
| Name | A name for the subnet. |
| Description | Optional notes about the subnet. |
| Subnet / Network Address | The IP address of the subnet, for example 192.168.1.0. |
| Subnet Mask | The subnet mask, for example 255.255.255.0. |
| VLAN Name | Optional VLAN name to associate with this subnet. |
| Location | Physical or logical location of the subnet. |
| Discovery Mode | Choose whether to discover addresses using Ping, SNMP, or both. |
| DNS Lookup | Enable Forward Lookup, Reverse Lookup, or both for IP-to-hostname resolution. |
| Polling Interval | How often Cloudmon polls this subnet. |
| Probe | The Cloudmon probe that will scan this subnet. |
| Tags | Optional tags for filtering and grouping subnets. |
Add Supernet
A supernet groups multiple subnets under a common network block. Cloudmon divides the supernet into individual subnets based on the desired subnet mask and lists them in the Discovered Subnets page. Subnets must be manually approved before Cloudmon begins scanning them.
| Field | Description |
| Name | A name for the supernet. |
| Network | The network IP address for the supernet block. |
| Network Mask | The main subnet mask for the supernet. |
| Desired Subnet Mask | The subnet size Cloudmon will divide the supernet into. Must represent a smaller network than the supernet mask, i.e. more bits set to 1. |
| Probe | The Cloudmon probe that will manage discovery and polling for the resulting subnets. |
Add Router
The Add Router option lists SNMP-enabled devices in Cloudmon that have IP forwarding enabled, such as Layer 3 switches, gateways, firewalls, and printers. Selecting a router and triggering subnet discovery causes Cloudmon to find all subnets associated with that device and list them in the Discovered Subnets tab. These must be manually approved before scanning begins.
What Cloudmon Monitors
The IPAM Dashboard gives a visual summary of total subnets, overall IP address usage, DNS and SNMP status across all subnets, and highlights critical metrics such as conflicts or reserved IPs. The Subnets view shows each subnet with its total address count, used, available, transient, and conflicting address counts, and DNS and SNMP validation status. Clicking into a subnet shows the full list of individual IP addresses and their current status.
Alarms
Alarm triggers can be configured per subnet to alert on IP usage thresholds, such as when a subnet reaches a defined percentage of addresses in use. Learn more.
Troubleshooting
| Symptom | Likely Cause | Fix |
| Subnet showing no IP data after adding | Scanning has not been enabled, or the probe cannot reach the subnet | Confirm scanning is enabled for the subnet and that the assigned probe can reach the subnet network range |
| Discovered subnets not moving to Subnets page | Subnets in the Discovered Subnets tab have not been approved | Navigate to the Discovered Subnets tab and approve or enable scan for the subnets you want Cloudmon to monitor |
| DNS status showing as failed for addresses | DNS lookup is enabled but the DNS server is unreachable or the address has no DNS record | Verify the DNS server is reachable from the probe and that DNS records exist for the addresses in question |
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