VLAN / Subnet Planner

Organisation

OrganisationPrepared byGateway conventionStatic addresses reserved per VLANSupernet (optional)Block per site

Sites

Site nameBase network (CIDR)

VLANs at Head office

VLAN	Name	Purpose	Hosts	Floors

Hosts = devices you expect on the VLAN. When floors or rooms are listed, the subnet is sized for their total if that is larger. The gateway, the static reserve, network and broadcast are added on top.

Subnets already in use at this site (optional, one per line)

Brownfield networks: paste what is already live and the planner places new VLANs around it. Retained subnets appear in the document as-is.

Study mode

Show the work

Turns every subnet row into a worked example — host bits, borrowed bits, block size, binary — and adds practice problems below. Built for CCNA revision.

All sites

Site	Base	VLANs	Assigned	Status
Head office	10.10.0.0/22	6	78%	OK
Warehouse	10.20.0.0/24	3	88%	OK

Head office — 10.10.0.0/22

1,024 addresses · 78% planned

VLAN	Network	Mask	Gateway	Pool	Need / usable
VLAN 20 Users	10.10.0.0/24	255.255.255.0	10.10.0.1	10.10.0.12 – 10.10.0.254	200 / 254
VLAN 50 Guest	10.10.1.0/24	255.255.255.0	10.10.1.1	10.10.1.12 – 10.10.1.254	120 / 254
VLAN 30 Voice	10.10.2.0/25	255.255.255.128	10.10.2.1	10.10.2.12 – 10.10.2.126	100 / 126
VLAN 10 Management	10.10.2.128/26	255.255.255.192	10.10.2.129	10.10.2.140 – 10.10.2.190	30 / 62
VLAN 60 Servers	10.10.2.192/26	255.255.255.192	10.10.2.193	10.10.2.204 – 10.10.2.254	25 / 62
VLAN 40 Printers	10.10.3.0/27	255.255.255.224	10.10.3.1	10.10.3.12 – 10.10.3.30	10 / 30

Ranges by floor / room

VLAN 20 (Users)

Floor 110.10.0.12 – 10.10.0.91 (80)
Floor 210.10.0.92 – 10.10.0.161 (70)
Floor 310.10.0.162 – 10.10.0.211 (50)
unassigned10.10.0.212 – 10.10.0.254 (43)

VLAN 30 (Voice)

Floor 110.10.2.12 – 10.10.2.51 (40)
Floor 210.10.2.52 – 10.10.2.86 (35)
Floor 310.10.2.87 – 10.10.2.111 (25)
unassigned10.10.2.112 – 10.10.2.126 (15)

Reserved for growth

10.10.3.128/25 · 126 usable10.10.3.64/26 · 62 usable10.10.3.32/27 · 30 usable

Addressing-standard document

# Example Co. — IP Addressing Standard

| | |
|---|---|
| **Organisation supernet** | `10.0.0.0/8` |
| **Sites** | 2 |
| **Prepared by** | — |
| **Date** | 2026-09-07 |
| **Version** | 1.0 |

## 1. Conventions

- **Sites** each own one base network. No site block overlaps another; new sites take the next free block.
- **Gateway** is the first usable address of every subnet.
- **Static reservations**: the 10 addresses immediately after the gateway are held for servers, printers and network devices. Record each assignment in the static register.
- **Pool** is the remainder of the usable range. Where a VLAN spans floors or rooms, the pool is split into one contiguous range per location, in the order listed; anything left is the unassigned pool.
- **Sizing**: each subnet is sized for its host count plus the gateway and the static reserve, rounded up to the next power of two — the pool always holds the devices planned for it.
- **Allocation method**: VLSM, largest subnet first, so every block is aligned and unused space stays contiguous.
- **Existing subnets** listed under a site were in use before this plan. They are retained as-is and new VLANs were placed around them.
- **Naming**: `VLAN<id>-<Name>`; interface descriptions use the same string.

## 2. Sites

| Site | Base network | Addresses | VLANs | Existing | Assigned |
|---|---|---|---|---|---|
| Head office | `10.10.0.0/22` | 1,024 | 6 | — | 78.1% |
| Warehouse | `10.20.0.0/24` | 256 | 3 | 1 | 93.8% |

## 3. Subnets by site

### 3.1 Head office — `10.10.0.0/22`

| VLAN | Name | Purpose | Network | Mask | Gateway | Static | Pool | Broadcast | Hosts needed / usable |
|---|---|---|---|---|---|---|---|---|---|
| 10 | Management | Switches, APs, iLO/iDRAC | `10.10.2.128/26` | 255.255.255.192 | 10.10.2.129 | 10.10.2.130 – 10.10.2.139 | 10.10.2.140 – 10.10.2.190 | 10.10.2.191 | 30 / 62 |
| 20 | Users | Staff workstations | `10.10.0.0/24` | 255.255.255.0 | 10.10.0.1 | 10.10.0.2 – 10.10.0.11 | 10.10.0.12 – 10.10.0.254 | 10.10.0.255 | 200 / 254 |
| 30 | Voice | IP phones | `10.10.2.0/25` | 255.255.255.128 | 10.10.2.1 | 10.10.2.2 – 10.10.2.11 | 10.10.2.12 – 10.10.2.126 | 10.10.2.127 | 100 / 126 |
| 40 | Printers | MFPs and label printers | `10.10.3.0/27` | 255.255.255.224 | 10.10.3.1 | 10.10.3.2 – 10.10.3.11 | 10.10.3.12 – 10.10.3.30 | 10.10.3.31 | 10 / 30 |
| 50 | Guest | Guest Wi-Fi, internet only | `10.10.1.0/24` | 255.255.255.0 | 10.10.1.1 | 10.10.1.2 – 10.10.1.11 | 10.10.1.12 – 10.10.1.254 | 10.10.1.255 | 120 / 254 |
| 60 | Servers | On-prem servers | `10.10.2.192/26` | 255.255.255.192 | 10.10.2.193 | 10.10.2.194 – 10.10.2.203 | 10.10.2.204 – 10.10.2.254 | 10.10.2.255 | 25 / 62 |

**Ranges by floor / room**

| VLAN | Location | Range | Addresses |
|---|---|---|---|
| 20 Users | Floor 1 | 10.10.0.12 – 10.10.0.91 | 80 |
| 20 Users | Floor 2 | 10.10.0.92 – 10.10.0.161 | 70 |
| 20 Users | Floor 3 | 10.10.0.162 – 10.10.0.211 | 50 |
| 20 Users | _unassigned pool_ | 10.10.0.212 – 10.10.0.254 | 43 |
| 30 Voice | Floor 1 | 10.10.2.12 – 10.10.2.51 | 40 |
| 30 Voice | Floor 2 | 10.10.2.52 – 10.10.2.86 | 35 |
| 30 Voice | Floor 3 | 10.10.2.87 – 10.10.2.111 | 25 |
| 30 Voice | _unassigned pool_ | 10.10.2.112 – 10.10.2.126 | 15 |

**Reserved for growth** (largest first; allocate new VLANs from the smallest block that fits)

| Block | Addresses | Usable |
|---|---|---|
| `10.10.3.128/25` | 128 | 126 |
| `10.10.3.64/26` | 64 | 62 |
| `10.10.3.32/27` | 32 | 30 |

### 3.2 Warehouse — `10.20.0.0/24`

| VLAN | Name | Purpose | Network | Mask | Gateway | Static | Pool | Broadcast | Hosts needed / usable |
|---|---|---|---|---|---|---|---|---|---|
| 10 | Management | Switches, APs | `10.20.0.192/27` | 255.255.255.224 | 10.20.0.193 | 10.20.0.194 – 10.20.0.203 | 10.20.0.204 – 10.20.0.222 | 10.20.0.223 | 10 / 30 |
| 20 | Users | Office workstations | `10.20.0.128/26` | 255.255.255.192 | 10.20.0.129 | 10.20.0.130 – 10.20.0.139 | 10.20.0.140 – 10.20.0.190 | 10.20.0.191 | 20 / 62 |
| 70 | Scanners | Handheld barcode scanners | `10.20.0.0/25` | 255.255.255.128 | 10.20.0.1 | 10.20.0.2 – 10.20.0.11 | 10.20.0.12 – 10.20.0.126 | 10.20.0.127 | 60 / 126 |

**Ranges by floor / room**

| VLAN | Location | Range | Addresses |
|---|---|---|---|
| 70 Scanners | Receiving | 10.20.0.12 – 10.20.0.31 | 20 |
| 70 Scanners | Picking | 10.20.0.32 – 10.20.0.61 | 30 |
| 70 Scanners | Shipping | 10.20.0.62 – 10.20.0.71 | 10 |
| 70 Scanners | _unassigned pool_ | 10.20.0.72 – 10.20.0.126 | 55 |

**Existing subnets (retained)**

| Network | Name | Addresses |
|---|---|---|
| `10.20.0.240/28` | Legacy label printers — keep | 16 |

**Reserved for growth** (largest first; allocate new VLANs from the smallest block that fits)

| Block | Addresses | Usable |
|---|---|---|
| `10.20.0.224/28` | 16 | 14 |

## 4. Static assignments

| Site | Address | VLAN | Device | Owner | Notes |
|---|---|---|---|---|---|
| Head office | 10.10.2.129 | 10 | Gateway — VLAN 10 (Management) | Network | SVI / router sub-interface |
| Head office | 10.10.0.1 | 20 | Gateway — VLAN 20 (Users) | Network | SVI / router sub-interface |
| Head office | 10.10.2.1 | 30 | Gateway — VLAN 30 (Voice) | Network | SVI / router sub-interface |
| Head office | 10.10.3.1 | 40 | Gateway — VLAN 40 (Printers) | Network | SVI / router sub-interface |
| Head office | 10.10.1.1 | 50 | Gateway — VLAN 50 (Guest) | Network | SVI / router sub-interface |
| Head office | 10.10.2.193 | 60 | Gateway — VLAN 60 (Servers) | Network | SVI / router sub-interface |
| Warehouse | 10.20.0.193 | 10 | Gateway — VLAN 10 (Management) | Network | SVI / router sub-interface |
| Warehouse | 10.20.0.129 | 20 | Gateway — VLAN 20 (Users) | Network | SVI / router sub-interface |
| Warehouse | 10.20.0.1 | 70 | Gateway — VLAN 70 (Scanners) | Network | SVI / router sub-interface |
| | | | | | |

## 5. Change history

| Date | Version | Change | By |
|---|---|---|---|
| 2026-09-07 | 1.0 | Initial addressing plan (2 sites) | — |

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_Generated with the Rackbinder VLAN / Subnet Planner. All computation ran in the browser; nothing was uploaded._

Covers every site: conventions, site summary with overlap check, subnets and floor/room ranges per site, retained subnets, static register, change history. Markdown for your wiki or Git repo; Word for the client.