Subnetz-Rechner (IPv4 CIDR)
D'IPv4-Netzwierk besteet aus 4 Subnetzer: Netzwierk, Broadcast, Mask, Wildcard, Host Range an Count.
D'Resultater ginn aktualiséiert wéi se getippt ginn.
Iwwer dëse Rechner
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.
Häufig gestallt Froen
Wéi vill Hosten sinn an engem Subnetz?
D'Adress ass 22200, d'Uertschaft ass 20, d'Gemeng 20, d'Gemeng 20 ass eng Gemeng an der Gemeng Réiden an der Provënz Lëtzebuerg.
Wat ass eng Plazhaltermaske?
Eng Wildcard Mask ass d'Bit-Inverse vun der Subnetzmask (255.0 → 0.255). Access-Control-Listen an OSPF benotzen se fir Adressberäicher ze vergläichen.
Wat ass den Ënnerscheed tëscht Netzwierk an Broadcast-Adresse?
D' Netzwierkadresse (all Host-Bits 0) nennt d'Subnetz; d' Broadcast-Adress (all Host-Bits 1) erreecht all Host dobäi. Keng vun deenen zwee kann engem Apparat zougewise ginn.
Wat heescht de CIDR-Präisch (/24, /16)?
Et ass d'Zuel vun de virleefege Bits, déi den Netzwierkdeel vun der Adress bilden. E méi grousst Präfix bedeit méi Netzwierkbits an manner Hostbits, also e méi klengt Subnetz: /24 gëtt 254 Hosts, /25 gëtt 126, an all extra Bit halwert de Block.
Wéi deelen ech e Netzwierk an kleng Subnetzer op?
Host- Bits leien duerch Erhéijung vum Präfix. Wann Dir e / 24 an zwee / 25s deelt, kritt Dir zwee Blöcke mat 126 Hosten; wann Dir op / 26 geet, kritt Dir véier Blöcke mat 62. All zousätzlecht Präfix- Bit verdéngt d' Zuel vun de Subnetzer an halwert hir Gréisst.
Wat ass eng IP-Adress?
D'Adressen an der Klass A (1-126), an der Klass B (128-191) an der Klass C (192-223) sinn Unicast-Adressen, déi an der Klass D (Multicast) an der Klass E (reserved) falen.
Déi 31. an 32.
A / 31 huet nëmmen zwou Adressen an keng Broadcast, benotzt fir Punkt-zu-Punkt Verbindungen tëscht Routeren. A / 32 ass eng eenzeg Host Adress, üblech fir Loopbacks an Host Routen. De Rechner behandelt béid speziell Fäll.
API — benotzt dëse Rechner aus Code
Dësen Rechner als e fräien JSON Endpunkt opruffen - keng Schlëssel erfuerderlech. D'Feldwäerter ënnendrënner als Ufroparameter oder JSON schécken. Anything you omit uses the same default this page is pre-filled with; an unknown parameter is a 400, never a silent zero. Liest d'vollstänneg API-Dokumentatioun →
Endpunkt
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);D'Resultater sinn nëmmen als allgemeng Orientéierung, net als finanziell, medizinesch oder Steuerberodung.