IT-03
IP Table Generator
ANSI/BICSI 007-2024 · ANSI/BICSI 008-2024 · SMPTE ST 2110 · NEC 800
- 01Plan a VLAN subnet and generate a conflict-free device address table with hostnames, reserved ranges, a DHCP pool and growth headroom checks.
- 02Tip. Leave gaps between device classes rather than numbering consecutively. A block that runs cameras straight into displays with no spare cannot absorb a single late addition without renumbering everything downstream of it.
- 03/24 — 254 usable hosts
- 04/23 — 510 usable hosts
- 052 — Addresses reserved per subnet
- 06BICSI 007 — Structured addressing
Structured address planning
An address plan is documentation as much as configuration. It has to survive commissioning, handover and every change made by someone who was not in the room when it was written — which means the structure has to be obvious from the addresses themselves, and every assignment has to be checked for conflicts before it reaches a device.
Subnet capacity
Two addresses in every subnet are unusable — the network address and the broadcast address — and the gateway takes a third. Size the block for what the system will grow into.
Use cases
- /24 — 254 usable host addresses
- /23 — 510 usable host addresses
- /25 — 126 usable host addresses
- Reserve a range for infrastructure and static services
Formula
Usable hosts = 2^(32 − prefix) − 2
ANSI/BICSI 007
Grouping and documentation
Device groups get contiguous blocks with a role prefix, so an address alone identifies what is on the other end. Static, reserved and dynamic assignments are recorded distinctly.
Use cases
- One prefix per device class — CAM, DSP, ENC, DISP
- Leave spare addresses between classes for growth
- VLAN per traffic type, not per room
- Detect conflicts before commissioning, not on site
Formula
Host = start address + group offset + device index
Conflict-checked on generation
AV-over-IP traffic is multicast, and multicast addressing is a separate plan from unicast host addressing. Group ranges, IGMP querier placement and snooping configuration all need deciding alongside this table, not after it.
- 01ICT design for intelligent buildings — ANSI/BICSI 007-2024
- 02Wireless LAN design — ANSI/BICSI 008-2024
- 03Uncompressed video over IP — SMPTE ST 2110
- 04Communications circuits — NEC 800