DHCP Scope Planner
Turn a subnet into a practical DHCP scope plan with gateway, reserved addresses, and lease capacity.
Enter network values
Use the example or enter your own subnet, plan, MAC, or port value.
Results update locally in your browser.
Plan gateway, reserved/static addresses, DHCP pool range, and estimated lease capacity for an IPv4 subnet.
DHCP scope insights
Capacity view for gateway, static reserves, dynamic pool, and safe lease headroom.
225 DHCP addresses from 254 usable hosts.
187 suggested active leases after buffer · High — growth could exhaust capacity.
The scope has workable capacity, but active leases should be monitored because the target uses 74% of usable host space.
Next: Create exclusions/reservations first, then watch lease utilization during rollout.
Copy DHCP review memo
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Print worksheet
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CSV / print export
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Gateway/static reserve vs DHCP pool inside the usable subnet.
Gateway
192.168.20.1
Static reserve
192.168.20.2 – 192.168.20.29
DHCP pool
192.168.20.30 – 192.168.20.254
DNS / NTP / option reminders
- Set DNS servers, search/domain suffix, and NTP/time sources before production cutover.
- Voice networks may need DHCP option 66/150 or vendor-specific options; PXE may need boot options.
- Document lease duration, reservations, exclusions, and relay/helper addresses per VLAN.
Planning notes
Use this as a worksheet and sanity check, not an automatic production configuration. Confirm VLAN IDs, routed interfaces, DHCP reservations, firewall rules, switch trunks, cloud ranges, and documentation standards before deploying changes.
Get a better answer from the DHCP Scope Planner
- Start with the example values to see how the tool behaves.
- Swap in your own numbers, even if they are rough first-pass estimates.
- Change one input at a time so you can see what actually moves the result.
What the result means
The result turns network notation into something easier to read: ranges, host counts, masks, wildcard masks, ports, or planning blocks.
How to use it
Use the output to plan or double-check, then compare it with the real network before changing a route, VLAN, DHCP scope, firewall rule, or ACL.
What can change it
A valid network number can still be wrong for your environment if it overlaps, conflicts with routing, exposes traffic, or breaks change-control rules.
Good for
Reserve infrastructure and static addresses.
Check next
Compare your result with VLAN Planner, Network Planner, CIDR Subnet Calculator when you want more context.
Best habit
Run a conservative case and an optimistic case. The gap between them is often more useful than a single answer.
Common uses
- Reserve infrastructure and static addresses.
- Choose a DHCP start/end range.
- Keep headroom in a lease pool.
Common questions
Is the DHCP Scope Planner private?
Yes. CalcShelf calculators run without an account, do not save calculator entries, and do not put raw inputs into shareable URLs or analytics events.
How accurate is the DHCP Scope Planner?
It follows common IPv4, CIDR, mask, range, and port conventions. Production networks still need live-config, routing, ACL, overlap, and change-control review.
What should I check after using the DHCP Scope Planner?
Verify live allocations, overlaps, gateway conventions, routes, ACL/firewall order, documentation, and rollback plan before production changes.
Which calculator should I try next?
Use the related calculators below to cross-check the same decision from another angle before you act.
Method behind the estimate
Networking tools use IPv4, CIDR, subnet mask, wildcard mask, range, VLAN, DHCP, and port-reference rules for planning and sanity checks.
Why the detail matters
Before changing production routing, firewall, VLAN, DHCP, or address plans, verify against the actual network, documentation, and change-control process.
Privacy guardrail
Your calculator values are for you. CalcShelf does not require an account, save calculator entries, put your numbers into shareable URLs, or use raw inputs as analytics events.
Copy or print safely
Use any copy, print, or worksheet controls as local handoff tools for your own notes, supplier calls, lender questions, or implementation checklist. They are there to help you explain the result to a human.
Before acting
Treat the result as a decision draft, not a verdict. Recheck the source numbers, run a downside case, and verify the real-world rule, quote, label, or spec that controls the final answer.
Last reviewed: May 11, 2026. See methodology and editorial policy for formulas, assumptions, rounding, review approach, and limitations. For network changes, verify against live configuration, vendor docs, and change-control requirements.