Subnetting VLSM dengan Network: 192.168.10.0/25

VLSM – 192.168.10.0/25
Diagram & Alur Perhitungan

📌 Kebutuhan Subnet

• Subnet A = 60 host
• Subnet B = 24 host
• Subnet C = 12 host
• Subnet D = 5 host

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🧩 Langkah Perhitungan VLSM

1. Urutkan kebutuhan host dari terbesar ke terkecil.
2. Alokasikan subnet terbesar lebih dulu.
3. Tentukan prefix paling sesuai (host >= kebutuhan).
4. Catat network, range host, dan broadcast.
5. Lanjutkan ke network berikutnya setelah broadcast.

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📐 Penentuan Prefix

Kebutuhan Host	Prefix	Total Alamat	Usable Host
60	/26	64	62
24	/27	32	30
12	/28	16	14
5	/29	8	6

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📦 Alokasi Subnet dari 192.168.10.0/25

▶ Subnet A

• Network: 192.168.10.0/26
• Host: 192.168.10.1 – 192.168.10.62
• Broadcast: 192.168.10.63
• Usable: 62 host

▶ Subnet B

• Network: 192.168.10.64/27
• Host: 192.168.10.65 – 192.168.10.94
• Broadcast: 192.168.10.95
• Usable: 30 host

▶ Subnet C

• Network: 192.168.10.96/28
• Host: 192.168.10.97 – 192.168.10.110
• Broadcast: 192.168.10.111
• Usable: 14 host

▶ Subnet D

• Network: 192.168.10.112/29
• Host: 192.168.10.113 – 192.168.10.118
• Broadcast: 192.168.10.119
• Usable: 6 host

▶ Sisa Address

• Range: 192.168.10.120 – 192.168.10.127
• Cocok untuk 1 subnet /29 tambahan

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📊 Tabel Ringkasan VLSM

Subnet	CIDR	Network	Usable Host	Broadcast	Usable
A	/26	192.168.10.0	192.168.10.1 - 192.168.10.62	192.168.10.63	62
B	/27	192.168.10.64	192.168.10.65 - 192.168.10.94	192.168.10.95	30
C	/28	192.168.10.96	192.168.10.97 - 192.168.10.110	192.168.10.111	14
D	/29	192.168.10.112	192.168.10.113 - 192.168.10.118	192.168.10.119	6
Cadangan	/29	192.168.10.120	192.168.10.121 - 192.168.10.126	192.168.10.127	6

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🗺️ Diagram Alur Perhitungan VLSM

[Start: 192.168.10.0/25]
    |
    |-- Subnet A: 60 hosts → /26 → 192.168.10.0 - 63
    |
    |-- Next 64 → Subnet B: 24 hosts → /27 → 192.168.10.64 - 95
    |
    |-- Next 96 → Subnet C: 12 hosts → /28 → 192.168.10.96 - 111
    |
    |-- Next 112 → Subnet D: 5 hosts → /29 → 192.168.10.112 - 119
    |
    |-- Sisa 120 - 127 → cadangan (/29)