Kalkulatè sousèt (IPv4 CIDR)
IPv4 gen ladann depatman sa yo: rezo, broadcast, mask, wildcard, rezo ak kont.
Rezilta yo mete ajou pandan w ap ekri.
Atik sa a
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.
Kesyon ki poze souvan
Ki kantite òdinatè ki nan yon sous-réseau?
Yon /n sous-réseau gen 2^(32−n) adrès, mwens de rezèv pou rezo a ak broadcast. yon /24 gen 256 adrès ak 254 òdinatè ki ka itilize.
Ki sa ki se yon mask wildcard?
Yon mask wildcard se yon mask ki gen yon valè ki diferan de mask sous-réseau a (255.0 → 0.255). lis kontwòl aksè ak OSPF itilize li pou matche yon seri adrès.
Ki diferans ki genyen ant rezo ak adrès broadcast?
Adrès rezo a (tou bit òdinatè a 0) bay non sous-réseau a; adrès broadcast la (tou bit òdinatè a 1) rive nan chak òdinatè sou li. Yo pa ka detèmine ni youn ni lòt pou yon aparèy.
Ki sa prefiks CIDR (/24, /16) vle di?
Li se kantite bit ki nan devan ki fòme pati rezo adrès la. Yon prefiks pi gwo vle di plis bit rezo ak mwens bit òdinatè, se konsa yon sous-réseau pi piti: /24 bay 254 òdinatè, /25 bay 126, ak chak bit ekstra diminye blokaj la pa mwatye.
Ki jan pou m divize yon rezo nan subnets pi piti?
Prensipe bit òdinatè a pa ogmante prefiks la. Si ou divize yon / 24 an de / 25s, ou pral jwenn de blok 126 òdinatè; si ou ale nan / 26, ou pral jwenn kat blok 62. Chak bit prefiks ajoute a double kantite sous- rezo yo epi diminye gwosè yo pa mwatye.
Ki sa ki se yon klas adrès IP?
Ansyen klasifikasyon an divize adrès pa premye oktet yo: Klas A (1-126), Klas B (128-191) ak Klas C (192-223) pou unicast, plis D pou multicast ak E reserved. CIDR te ranplase klas pou alokasyon, men kalkulatè a toujou rapòte klas la adrès ki tonbe nan.
Ki sa ki /31 ak /32 sous-réseaux ki itilize pou?
A / 31 gen sèlman de adrès ak pa gen broadcast, ki itilize pou pwen-a-poin lyen ant routeurs. A / 32 se yon sèl adrès òdinatè, komen pou loopbacks ak wout òdinatè. Calculator a kontwole tou de ka espesyal.
API — itilize sa a calculateur soti nan kòd
Apèl sa a calculateur kòm yon gratis JSON pwent-de-fini - pa gen okenn kle ki nesesè. Envoye valè jaden anba a kòm paramèt kesyonè oswa JSON. Anything you omit uses the same default this page is pre-filled with; an unknown parameter is a 400, never a silent zero. Li dokiman API a an antye →
Endpoint
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);Rezilta yo se estimasyon pou kòmandman jeneral sèlman, pa finansye, medikal oswa konsèy taks.