Kalkulator & Smart Advisor
Analisis jaringan presisi (IPv4/IPv6) atau dapatkan rekomendasi prefix.
๐ Analisis Manual
โจ Smart Advisor
Masukkan jumlah host, sistem akan mencarikan prefix efisien.
Menunggu Perintah
Gunakan panel di form input untuk melihat hasil analisis.
VLSM Network Planner
Otomatisasi pembagian IP tanpa tumpang tindih untuk efisiensi alamat IP.
Daftar Segmen / Divisi
FLSM Subnet Divider
Membagi jaringan utama menjadi beberapa subnet dengan ukuran yang sama rata.
๐๏ธ Pengaturan Jaringan
Data Belum Diproses
Masukkan data di form pengaturan untuk melihat hasil.
Ensiklopedia Jaringan
Pemahaman menyeluruh arsitektur dan protokol pengalamatan IP.
Fundamental IP Address
IP (Internet Protocol) Address adalah alamat logika yang diberikan kepada perangkat agar bisa berkomunikasi di jaringan. Berbeda dengan MAC Address yang merupakan "sidik jari" fisik dari pabrik, IP Address bersifat dinamis.
Public vs Private IP
-
๐
IP Public: Bisa diakses langsung dari internet. Disediakan ISP.
-
๐
IP Private: IP lokal (LAN). Butuh NAT untuk ke internet.
๐ Anatomi Subnetting
Network ID
Ibarat "Nama Jalan". Ini adalah alamat pertama dalam subnet yang berfungsi sebagai identitas jaringan. Tidak bisa dipasang ke komputer.
Host ID (Usable)
Ibarat "Nomor Rumah". Rentang alamat IP valid di tengah yang bisa dipasangkan ke PC, Laptop, atau Router.
Broadcast Address
Ibarat "Toa Pengumuman". Ini adalah alamat terakhir dalam subnet. Paket data ke IP ini akan diterima oleh semua komputer di jaringan tersebut.
โ ๏ธ IP Khusus (Reserved IP)
Loopback
127.0.0.1
Untuk menguji network adapter di komputer sendiri (Localhost).
APIPA
169.254.x.x
Dibuat otomatis oleh Windows jika gagal mendapat IP dari DHCP Server.
Default Route
0.0.0.0/0
Mewakili "semua rute di internet". Sering dipakai di routing tabel.
IPv6 Localhost
::1
Sama seperti 127.0.0.1 namun ini adalah versi IPv6.
๐ Klasifikasi IPv4 (Classful)
Class A
Skala BesarIP Private
10.0.0.0/8
Class B
Skala MenengahIP Private
172.16.0.0/12
Class C
Skala KecilIP Private
192.168.0.0/16
๐ Masa Depan: Transisi ke IPv6
Karena alamat IPv4 sudah habis, dunia beralih ke IPv6. Formatnya bukan lagi desimal 32-bit, melainkan Heksadesimal 128-bit. Kapasitasnya hampir tak terbatas!
Format Dasar IPv6
2001:0db8:85a3:0000:0000:8a2e:0370:7334
Format Kompresi (Disingkat)
2001:db8:85a3::8a2e:370:7334
๐งฎ Contoh Perhitungan Subnetting
Pelajari cara memecah jaringan secara manual, langkah demi langkah.
IP: 192.168.10.0 / 24 โ Berapa host yang bisa dipakai?
Langkah Perhitungan
IP: 192.168.1.0 / 26 โ Berapa subnet & host tiap subnet?
Langkah Perhitungan
4 Subnet yang Terbentuk
Net: .0 | Usable: .1-.62 | BC: .63
Net: .64 | Usable: .65-.126 | BC: .127
Net: .128 | Usable: .129-.190 | BC: .191
Net: .192 | Usable: .193-.254 | BC: .255
VLSM: 172.16.0.0/16 untuk 3 divisi (100, 50, 20 host)
VLSM (Variable Length Subnet Mask) menggunakan prefix berbeda tiap divisi agar tidak boros IP. Urutkan dari kebutuhan terbesar ke terkecil!
| Divisi | Kebutuhan | Prefix | Network ID | Range Usable | Host Tersedia |
|---|---|---|---|---|---|
| Produksi | 100 host | /25 | 172.16.0.0 | 172.16.0.1 โ .126 | 126 |
| Pemasaran | 50 host | /26 | 172.16.0.128 | 172.16.0.129 โ .190 | 62 |
| Keuangan | 20 host | /27 | 172.16.0.192 | 172.16.0.193 โ .222 | 30 |
๐ Tabel Referensi Subnet (Cheat Sheet)
Referensi cepat semua prefix yang paling sering dipakai di dunia nyata.
| Prefix | Subnet Mask | Total IP | Host Usable | Cocok Untuk |
|---|---|---|---|---|
| /8 | 255.0.0.0 | 16,777,216 | 16,777,214 | ISP besar / Backbone |
| /16 | 255.255.0.0 | 65,536 | 65,534 | Kampus / Instansi besar |
| /24 | 255.255.255.0 | 256 | 254 | Kantor kecil / LAN rumah |
| /25 | 255.255.255.128 | 128 | 126 | Departemen besar |
| /26 | 255.255.255.192 | 64 | 62 | Departemen menengah |
| /27 | 255.255.255.224 | 32 | 30 | Tim kecil / Lab |
| /28 | 255.255.255.240 | 16 | 14 | Ruangan server kecil |
| /29 | 255.255.255.248 | 8 | 6 | Koneksi antar router |
| /30 | 255.255.255.252 | 4 | 2 | Link Point-to-Point (WAN) |
| /32 | 255.255.255.255 | 1 | 0 | Host route / Loopback |
๐ข Studi Kasus Nyata
Bagaimana subnetting diterapkan dalam skenario dunia nyata.
Sekolah Menengah
Jaringan: 10.0.0.0/8
Sekolah membutuhkan jaringan terpisah untuk Lab Komputer, Ruang Guru, dan WiFi Siswa.
Rumah Sakit
Jaringan: 172.16.0.0/16
Rumah sakit wajib memisahkan jaringan medis, administrasi, dan pasien demi keamanan data.
Jaringan Rumahan (ISP)
Jaringan: 192.168.1.0/24
Modem ISP di rumah membuat jaringan /24. Router membagi IP via DHCP ke semua perangkat.
Perusahaan Multidepartemen
Jaringan: 10.10.0.0/16
Perusahaan dengan 5 departemen menggunakan VLSM agar pembagian IP efisien dan terstruktur.
| Divisi | Host | Subnet | Network |
|---|---|---|---|
| IT | 200 | /24 | 10.10.1.0 |
| HRD | 100 | /25 | 10.10.2.0 |
| Finance | 50 | /26 | 10.10.3.0 |
| Marketing | 25 | /27 | 10.10.4.0 |
| Server | 10 | /28 | 10.10.5.0 |
๐ Protokol Jaringan Penting
Protokol-protokol yang bekerja di balik layar setiap jaringan komputer.
DNS
Port 53Menerjemahkan nama domain (google.com) ke IP address (142.250.x.x). Ibarat buku telepon internet.
DHCP
Port 67/68Memberikan IP address secara otomatis ke perangkat yang bergabung ke jaringan. Tanpa DHCP, semua IP harus diatur manual.
NAT
Layer 3Menerjemahkan IP Private ke IP Public saat mengakses internet. Router di rumah selalu menggunakan NAT.
ARP
Layer 2Address Resolution Protocol โ menemukan MAC Address dari sebuah IP Address di jaringan lokal (LAN). Bekerja di Layer 2.
ICMP
Layer 3Internet Control Message Protocol โ dipakai oleh perintah ping dan traceroute untuk menguji konektivitas dan mengukur latensi antar host.
Routing
Layer 3Proses menentukan jalur terbaik paket data dari sumber ke tujuan antar jaringan berbeda menggunakan protokol seperti OSPF, RIP, atau BGP.
๐๏ธ Classful (Lama)
Sebelum 1993 โ kaku, boros IP
Contoh boros: butuh 300 host โ ambil Class B (65K) โ waste 65K IP!
โก CIDR (Modern)
Sejak 1993 โ fleksibel, efisien
Contoh efisien: butuh 300 host โ pakai /23 (510 host) โ hemat!
๐ก Tips & Trik Subnetting
Rumus dan shortcut yang wajib dihafal untuk ujian dan dunia kerja.
Rumus Host
2โฟ - 2
n = jumlah bit host. Dikurangi 2 untuk Network ID dan Broadcast.
Rumus Subnet
2หข
s = jumlah bit yang "dipinjam" dari host bits untuk subnet.
Block Size
256 - mask
Contoh: mask oktet = 192 โ block = 256-192 = 64. Interval antar subnet.
IP Address Fundamentals
An IP Address is a logical address assigned to devices to communicate. Unlike a MAC Address which is a physical hardware "fingerprint", an IP Address is dynamic.
Public vs Private IP
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๐
Public IP: Recognized globally. Provided by ISP.
-
๐
Private IP: Internal networks (LAN). Requires NAT.
๐ Subnet Anatomy
Network ID
Like a "Street Name". It's the first address in a subnet representing the network identity. Cannot be assigned to a PC.
Host ID (Usable)
Like a "House Number". The valid range of IPs in the middle that can be assigned to devices.
Broadcast Address
Like a "Megaphone". The last address. Packets sent here go to all computers in the subnet.
โ ๏ธ Reserved IPs
Loopback
127.0.0.1
Used to test the local machine's network adapter (Localhost).
APIPA
169.254.x.x
Auto-assigned by Windows if DHCP fails.
Default Route
0.0.0.0/0
Represents "all routes". Used heavily in routing tables.
IPv6 Localhost
::1
The IPv6 equivalent of 127.0.0.1.
๐ IPv4 Classification
Class A
Massive ScalePrivate IP
10.0.0.0/8
Class B
Medium ScalePrivate IP
172.16.0.0/12
Class C
Small ScalePrivate IP
192.168.0.0/16
๐ The Future: IPv6 Transition
Since IPv4 addresses are exhausted, the world is moving to IPv6. It uses a 128-bit Hexadecimal format, providing near-infinite capacity.
Standard Format
2001:0db8:85a3:0000:0000:8a2e:0370:7334
Compressed Format
2001:db8:85a3::8a2e:370:7334
๐งฎ Subnetting Calculation Examples
Learn to manually calculate subnets, step by step.
IP: 192.168.10.0 / 24 โ How many usable hosts?
Calculation Steps
IP: 192.168.1.0 / 26 โ How many subnets & hosts per subnet?
Calculation Steps
4 Subnets Created
Net: .0 | Usable: .1-.62 | BC: .63
Net: .64 | Usable: .65-.126 | BC: .127
Net: .128 | Usable: .129-.190 | BC: .191
Net: .192 | Usable: .193-.254 | BC: .255
VLSM: 172.16.0.0/16 for 3 departments (100, 50, 20 hosts)
VLSM uses different prefixes per department to minimize IP waste. Always sort from largest to smallest requirement!
| Department | Required | Prefix | Network ID | Usable Range | Available Hosts |
|---|---|---|---|---|---|
| Production | 100 hosts | /25 | 172.16.0.0 | 172.16.0.1 โ .126 | 126 |
| Marketing | 50 hosts | /26 | 172.16.0.128 | 172.16.0.129 โ .190 | 62 |
| Finance | 20 hosts | /27 | 172.16.0.192 | 172.16.0.193 โ .222 | 30 |
๐ Subnet Reference Table (Cheat Sheet)
Quick reference for the most commonly used prefixes in real-world networking.
| Prefix | Subnet Mask | Total IPs | Usable Hosts | Best Used For |
|---|---|---|---|---|
| /8 | 255.0.0.0 | 16,777,216 | 16,777,214 | Large ISP / Backbone |
| /16 | 255.255.0.0 | 65,536 | 65,534 | University / Large Enterprise |
| /24 | 255.255.255.0 | 256 | 254 | Small office / Home LAN |
| /25 | 255.255.255.128 | 128 | 126 | Large department |
| /26 | 255.255.255.192 | 64 | 62 | Medium department |
| /27 | 255.255.255.224 | 32 | 30 | Small team / Lab |
| /28 | 255.255.255.240 | 16 | 14 | Small server room |
| /29 | 255.255.255.248 | 8 | 6 | Inter-router links |
| /30 | 255.255.255.252 | 4 | 2 | Point-to-Point WAN links |
| /32 | 255.255.255.255 | 1 | 0 | Host route / Loopback |
๐ข Real-World Case Studies
How subnetting is applied in practical, real-world network scenarios.
High School Network
Network: 10.0.0.0/8
The school needs separate networks for the Computer Lab, Staff Room, and Student WiFi.
Home Network (ISP)
Network: 192.168.1.0/24
Your ISP modem creates a /24 network. The router distributes IPs via DHCP to all devices.
๐ Essential Network Protocols
The protocols working behind the scenes in every computer network.
DNS
Port 53Translates domain names (google.com) to IP addresses. Think of it as the internet's phone book.
DHCP
Port 67/68Automatically assigns IP addresses to devices joining the network. Without it, every IP must be configured manually.
NAT
Layer 3Translates a Private IP to a Public IP when accessing the internet. Your home router always uses NAT.
ARP
Layer 2Address Resolution Protocol โ finds the MAC address of a given IP address on the local LAN. Operates at Layer 2.
ICMP
Layer 3Used by ping and traceroute to test connectivity and measure latency between hosts.
Routing
Layer 3Determines the best path for packets across different networks using protocols like OSPF, RIP, or BGP.
๐๏ธ Classful (Legacy)
Pre-1993 โ rigid, wasteful
Wasteful: need 300 hosts โ forced to take Class B (65K) โ 65K IPs wasted!
โก CIDR (Modern)
Since 1993 โ flexible, efficient
Efficient: need 300 hosts โ use /23 (510 hosts) โ much less waste!
๐ก Subnetting Tips & Tricks
Formulas and shortcuts essential for exams and real-world work.
Host Formula
2โฟ - 2
n = number of host bits. Subtract 2 for Network ID and Broadcast.
Subnet Formula
2หข
s = number of bits "borrowed" from the host portion for subnetting.
Block Size
256 - mask
E.g: mask octet = 192 โ block = 256-192 = 64. The interval between subnets.