Kalkulator Subnet (IPv4 CIDR)
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This subnet calculator turns an IPv4 address and a CIDR prefix into the full structure of a subnet. An IPv4 address is 32 bits, usually written as four dot-separated octets like 192.168.1.10, and a CIDR prefix such as /24 splits those 32 bits into a network part (the leading bits, fixed for every host in the subnet) and a host part (the remaining bits, unique to each device). This calculator takes an address and a prefix length and derives the network address, broadcast address, subnet mask, wildcard mask and the range of usable host addresses, along with the IP class and total address count.
The size of a subnet is set by the prefix: a /n block holds 2^(32−n) addresses, of which two are reserved — the network address (all host bits 0, naming the subnet) and the broadcast address (all host bits 1, reaching every host). So a /24 has 2^8 = 256 addresses and 254 usable hosts, a /25 has 128 addresses and 126 usable hosts, and each extra prefix bit halves the block. As a worked example, 192.168.1.10/24 gives a network of 192.168.1.0, a broadcast of 192.168.1.255, a 255.255.255.0 mask, a 0.0.0.255 wildcard mask, and a usable host range of 192.168.1.1 to 192.168.1.254.
Subnetting is how networks are carved into manageable, secure segments — separating departments, sizing VLANs, planning address allocation and writing firewall and routing rules. The wildcard mask (the bitwise inverse of the subnet mask) is what Cisco access-control lists and OSPF use to match ranges of addresses. The /31 and /32 prefixes are special cases: /31 is used for point-to-point links with two usable addresses and no broadcast, and /32 describes a single host.
Sering kali mengajukan pertanyaan
Berapa banyak host yang ada di dalam jaringan?
A /n subnet has 2^(32−n) addresses, minus two reserved for the network and broadcast. A /24 has 256 addresses and 254 usable hosts.
Apa itu topeng wildcard?
A wildcard mask is the bitwise inverse of the subnet mask (255.255.255.0 → 0.0.0.255). Access-control lists and OSPF use it to match ranges of addresses.
Apa perbedaan antara jaringan dan alamat siaran?
Alamat jaringan (semua host bit 0) menamai subnet; alamat siaran (semua host bit 1) mencapai setiap host di atasnya. Tak dapat diberikan ke perangkat.
Apa arti awalan CIDR (/24, /16)?
Jumlah bit terkemuka yang membentuk bagian jaringan alamat. Awalan yang lebih besar berarti lebih banyak bit jaringan dan lebih sedikit bit host, jadi subnet kecil: /24 memberikan 254 host, /25 memberi 126, dan setiap tambahan bit bagian blok.
Bagaimana cara membagi jaringan menjadi jaringan kecil?
Meminjam bit tuan rumah dengan meningkatkan prefiks. Membagi a /24 menjadi dua /25s memberikan dua blok dari 126 host; pergi ke /26 memberikan empat blok 62. Masing-masing ditambahkan prefiks bit menggandakan jumlah subnet dan membagi ukuran mereka.
Apa itu kelas alamat IP?
The old classful scheme split addresses by their first octet: Class A (1–126), Class B (128–191) and Class C (192–223) for unicast, plus D for multicast and E reserved. CIDR replaced classes for allocation, but the calculator still reports the class the address falls in.
Apa itu /31 dan /32 jaringan yang digunakan?
A /31 hanya memiliki dua alamat dan tidak ada siaran, digunakan untuk point-to-point links antara router. A /32 adalah alamat host tunggal, umum untuk loopbacks dan rute host. Kalkulator menangani kedua kasus khusus.
API — use this calculator from code
Sebut kalkulator ini sebagai titik akhir JSON Gratis tidak diperlukan kunci. Kirim nilai ruas di bawah sebagai parameter query atau JSON. Apa pun yang Anda abaikan menggunakan baku yang sama halaman ini sudah diisi dengan; sebuah parameter tidak diketahui adalah 400, tidak pernah nol diam. Baca dokumen API penuh →
Titik Akhir
GET https://calculator.free/api/v1/subnet/curl
curl "https://calculator.free/api/v1/subnet/?ip=192.168.1.10&cidr=24"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/subnet/?" + new URLSearchParams({
"ip": "192.168.1.10",
"cidr": "24"
}));
const data = await r.json();
console.log(data.results);Hasil diperkirakan hanya untuk bimbingan umum, bukan keuangan, medis atau pajak.