Key Memory Tricks for /29 Subnets: /29 Subnets

• Block size rule: For /29, the increment is 8 in the last octet. → Just keep adding 8 to get the next network address.
• Usable hosts: Always 6 usable addresses (because 2 are reserved: network + broadcast).
• Pattern:
  
  • Network address = multiple of 8
  • First usable = +1
  • Last usable = +6
  • Broadcast = +7
  
  

 🧠 Quick Checklist

1. Write the subnet mask: 255.255.255.248
2. Remember increment = 8
3. Start at 14.0.128.0
4. Apply the formula:
   
   • Network = base
   • First usable = base + 1
   • Last usable = base + 6
   • Broadcast = base + 7
   
   

 ⚡ Fast Practice DrillTry writing the first 3 subnets quickly:

• 14.0.128.0 → usable: .1–.6 → broadcast: .7
• 14.0.128.8 → usable: .9–.14 → broadcast: .15
• 14.0.128.16 → usable: .17–.22 → broadcast: .23

If you can do these in under 30 seconds, you’ll be ready.SubnetNetworkFirst UsableLast UsableBroadcastHosts14.0.128.0/2914.0.128.014.0.128.114.0.128.614.0.128.7614.0.128.8/2914.0.128.814.0.128.914.0.128.1414.0.128.15614.0.128.16/2914.0.128.1614.0.128.1714.0.128.2214.0.128.236………………14.0.255.240/2914.0.255.24014.0.255.24114.0.255.24614.0.255.247614.0.255.248/2914.0.255.24814.0.255.24914.0.255.25414.0.255.2556