Subtīkla kalkulators (IPv4 CIDR)
Full IPv4 apakštīkla sadalījums: tīkls, pārraide, maska, savvaļācēja karte, datora diapazons un skaits.
Rezultāti atjaunināt, kā jūs tipa.
Par šo kalkulatoru
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.
Bieži uzdotie jautājumi
Cik daudz saimnieku ir apakštīklā?
Subnetā ir 2 ^ (32-n) adreses, mīnus divi rezervēti tīklam un raidīšanai. /24 ir 256 adreses un 254 lietojamie datori.
Kas ir savvaļas karšu maska?
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.
Kāda ir atšķirība starp tīklu un apraides adresi?
Tīkla adrese (visi datora biti 0) nosauc apakštīklu; apraides adrese (visi datora biti 1) sasniedz katru datoru uz tā. Nevar arī piešķirt ierīcei.
Ko nozīmē CIDR prefikss (24, / 16)?
Tas ir to vadošo bitu skaits, kas veido tīkla daļu no adreses. Lielākais priekšpiemērs nozīmē vairāk tīkla bitu un mazāk datora bitu, tāpēc mazāks apakštīkls: /24 dod 254 datori, 25 dod 126, un katrs papildu bitu uz pusēm bloku.
Kā sadalīt tīklu mazākos apakštīklos?
Borrow saimnieka biti, palielinot prefiksu. Sadalot 24 divos 25 dod divus blokus 126 saimniekiem; dodas uz 26/26 dod četrus blokus 62. Katrs pievienots prefikss bits dubulto apakštīklu skaitu un uz pusi to lielumu.
Kas ir IP adrešu klase?
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.
Kāpēc lieto /31 un 32 apakštīklus?
A /31 ir tikai divas adreses un nav pārraide, ko izmanto saites starp maršrutizatoriem. \/32 ir viena uzņēmēja adrese, kas ir kopīga cilpām un saimnieka maršrutiem. Kalkulators apstrādā abus īpašos gadījumus.
API – izmantot šo kalkulatoru no koda
Sūtīt lauka vērtības zemāk kā vaicājumu parametrus vai JSON. Jebko, ko nelaižat, izmanto to pašu noklusēto šo lapu, ar kuru tiek aizpildīta nezināma parametra versija 400, nekad kluss nulles variants. Lasīt visus API dokumentus →
Mērķa punkts
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);Rezultāti ir aprēķini tikai par vispārējiem norādījumiem, nevis finanšu, medicīnas vai nodokļu konsultācijām.